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RN E-200

FINAL REPORT

T1O'xsbarc / peaceful uses for nuclear explosives

,,.N.!TEO .$,TATES ALOM.IC__ENERGY COMMISSION IPLOWSHARE PROGRAM

NEVADA TEST SITE /JULY 6, 1962

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LEGAL NOTICEThis report was prepared as an account of Government sponsored work. Neither the UnitedStates, nor the Commission, nor any person acting on behalf of the Commission:

A. Makes any warranty or representation, expressed or implied, with respect to the accu-racy, completeness, or usefulness of the information contained in this report, or that the useof any information, apparatus, method, or process disclosed in this report may not infringeprivately owned rights; or

B. Assumes any liabilities with respect to the use of, or for damages resulting from theuse of any information, apparatus, method, or process disclosed in this report.

As used in the above, "person acting on behalf of the Commission" includes any em-ployee or contractor of the Commission, or employee of such contractor, to the extent thatsuch employee or contractor of the Commission, or employee of such contractor prepares,disseminates, or provides access to, any information pursuant to his employment or contractwith the Commission, or his employment with such contractor.

This report has .been reproduced directly from the bestavailable copy.

Printed in USA. Price $2.00. Available from the Office ofTechnical Services, Department of Commerce, Washington25, D. C.

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NUCLEAREXPLOSIONS - PEACEFULAPPLICATIONS

FINAL OFF-SITE REPORT

OF THE

PROJECT SEDAN EVENT

Ju ly 6, 1962

PLOIWSHARE PROGRAM

D..-I MTON ISTTm. .T A

~ $TATEM1thTApproved for Public Release

DisiributionUnlimited

By

U. S. Publ ic Heal th Serv ice

Off -S i t e R a d i o l o g i c a l Safety O rg a n i z a t i o n

0. R. Placak , O ff i c e r- i n - C ha rge

December 12, 1962

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FORWARD

The purpose o f this r e p o r t is to p r e s e n t a summary of th e O ff - S i t e Radio-l og i ca l Safe ty activities of th e U. S. Publ ic Health S e r v i c e dur ing th eP r o j e c t Sedan Opera t ion .

The r e p o r t is in t ended to serve as a source o f in fo rmat ion concern ing th eprocedures fo l lowed to p ro t ec t th e off-site popula t ion from i o n i z i n g r a d i - -a t ion and to p r e s e n t the da ta ob ta ined dur ing these activities.

It is n e i t h e r p o s s i b l e nor des i r ab l e to inc lude in this r e p o r t all th e ind i -vidua l da ta c o l l e c t e d by th e U. S. P u b l i c Heal th S e r v i c e ; however, in th e

even t t h a t more d e t a i l ed in fo rmat ion is d e s i r e d , it may be obta ined from th ePHS O ff - S i t e Activities, P. 0. Box 684, Las Vegas, Nevada.

Every effort has been made to make 'this r e p o r t as comprehensive as p o s s i b l ean d to e l i m i n a t e e r r o r s ; however, if an y anomalies are d e t e c t e d , it wouldbe apprec ia ted if they would be c a l l e d to o ur a t t en t i on fo r verification.

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INDEX

Page Number

FORWARD ii

INDEX iii

OPERATIONAL PROCEDURES v

COLLECTION OF DATA vi

SYNOPSIS v ii

CHAPTER I - AERIAL MONITORING 1

Table I - Aeria l Monitoring Results 2

CHAPTER II - GROUND MONITORING 4

Figure I - Roads Monitored 6

Figure II - Reference Map 7

Table II - Ground Monitoring Results 8

CHAPTER I II - GRCUND REMONITORING 26

Figure III- Roads Remonitored 27

Table III- Ground Remonitoring Results 28

CHAPTER IV - RECORDER CHART DATA 37

Figure IV - Recorder Charts 38

CHAPTER V - SAFETY MEASURES 39

CHAPTER VI - ESTIMATED EXPOSURE DOSES 41

Exposure Dose Curves 43

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Page Number

CHAPTER V II - FILM BADGES 56

Table IV - P e r s o n a l Film Badges 57

Table V - C o n t r o l Film Badges 59

Table VI - S t a t i o n Film Badges 60

CHAPTER V I I I - FALLOUT TRAYS 61

Figure V - Cloud Profile F a l l o u t Trays 62

Table V II - F a l l o u t Tray R e s u l t s 63

CHAPTER IX- SAMPLE ANALYSIS 68

CHAPTER X- AIR SAMPLING 69

Figure VI - Ins t rument Loca t ions 71

Table V I I I - A ir Sampl ing R e s u l t s 72

CHAPTER XI - &ATER AND VEGETATION SAMPLING 79

Table IX - WVater Sampl ing R e s u l t s 80

Table X - Vegeta t ion Sampl ing R e s u l t s 81

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OPERATIONAL PROCEDURES

The U. S. Public Health Service Off-Si te Radiological Safety Organizationo f th e Nevada Operations Office, AEC, was responsible to the Test Managerfo r th e es tabl ishment of a program to provide documentation of any radiat ionexposure to the off -s i te population resul t ing from Pro jec t Sedan. Thisincluded th e es tabl ishment of a procedure fo r taking appropr ia te action tol imit exposure to those values establ ished by th e Atomic Energy Commissionwhich was considered safe cr i te r ia fo r th e Sedan event. These c r i t e r i a wereoutlined in Chapter 0524, Off-Si te Rad-Safety Operations, of th e SOP-NTO asrevised.

An expanded public re la t ions program in th e off -s i te area surrounding th eNevada Test Site had been in effec t since February 1962. This programconsisted of U. S. Public Health Service Off-Site Radiological Safety Organ-izat ion representa t ives making weekly v i s i t s to th e res idents of th e off -si te area, explaining th e USPHS radiological safety ac t iv i t ies and present ingbr ie f ta lks and movies to civic groups and schools. In addi t ion, many res i -dents were given film badges to wear and others operated a ir samplers fo r theUSPHS, thus giving the people a sense of part ic ipat ion in th e program. As aresu l t , by July 6, 1962, th e date of the Sedan event, most people in th e NTSvic in i ty were famil iar with th e off -s i te rad-safe ac t iv i t ies and were accus-

tomed to the presence of USPHS personnel in th e f i e ld .

The off -s i te area defined as th e responsibi l i ty of th e U. S. Public HealthService by a Memorandum of Understanding between th e Public Health Serviceand th e Atomic Energy Commission was th e area extending from th e boundariesof th e Nevada Test Site to as fa r as circumstances warranted. To fulfillthis respons ib i l i ty, t ra ined USPHS personnel assigned to the Las Vegas, NevadaOperations Office were ut i l i zed to document th e event and take necessaryaction for public safety of th e off -s i te area during th e operation. Inaddition, PHS Reserve Officers who had experience in monitoring were cal ledto active duty to a s s i s t in th e ac t iv i t ies .

The U. S. Weather Bureau a t th e Control Point furnished predicted cloudt ra jectory maps and meteorological information which was used to directmonitoring teams pr io r to and during th e operation.

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COLLECTION OF DATA

As o u t l i n e d in th e O ff - S i t e R a d i o l o g i c a l Safe ty Plan fo r P r o j e c t Sedan,da ted May 29 , 1962, th e b a s i c o b j e c t i v e s o f this program were:

1. Dete rmine th e e x t e n t o f a i r b o r n e , s u r f a c e , an d subsur face con-t a m i n a t i o n off-site resulting from th e o p e r a t i o n .

2. Maintain a comprehensive record o f radioactivity assoc ia ted withth e opera t ion , inc lud ing nega t ive da ta .

3. Insure con t inu ing p ro t ec t i o n of th e publ ic h e a l t h .

4. Be prepared to e f f e c t emergency measures shou ld an unaccep tab lesituation develop.

5. Conduct necessa ry in format ion activities in sur rounding commu-nities to main ta in publ ic conf idence in th e s a f e conduc t of th eo p e r a t i o n .

6. I n v e s t i g a t e i n c i d e n t s t h a t might p o s s i b l y be attributed to theo p e r a t i o n .

7. D i s t r i b u t e and collect f i lm badges .

G. Provide mobile moni to r ing teams in s e l e c t e d popula ted p lacesrelatively near the o p e r a t i o n site.

9. Expand air sampling equipment an d con t inuous r e c o r d e r s .

10. Opera te th e off-site communicat ions ne t .

To c a r r y out t h e s e o b j e c t i v e s and secure th e f a c t s and d a t a , it was neces-sary to perform many opera t ions c o n c u r r e n t l y and utilize equipment andpersonne l to th e b e s t advan tage in th e o p e r a t i o n s .

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SYNOPSIS

The P r o j e c t Sedan even t was conducted as a p a r t o f th e Plowshare Programa t 1000 hours on Ju ly 6, 1962, in Area 10 o f th e Nevada Te s t Si t e by th eLawrence Radia t ion Labora to ry.

The P r o j e c t Sedan n u c l e a r c ra t e r ing exper iment r e su l t ed in th e fo rmat iono f a r ad ioa c t i ve cloud which drifted northward on a 10 degree bear ing fo r40 m i l e s to th e vicinity o f Queen Ci ty Summit, and then moved on a 20degree bear ing to Ely. From here , a n i g h t t i m e wind shift c a r r i ed th e cloudeas tward .

The h i g h e s t e s t i m a t e d total infinite exposure dose rece ived a t a popula tedl o c a t i on from th e P r o j e c t Sedan even t was 945 mr a t Diab lo ( p o p u l a t i o ne i gh t ) , an d th e second h i g h e s t was 22 6 mr a t Penoyer (popula t ion two).These are ca l c u l a t ed infinite doses . Persona l f i lm badges worn by th er e s i d e n t s and co l l e c t ed on Ju ly 9, 1962, i n d i ca t e 150 to 170 mr dose atthese two l o c a t i ons . In order to insure a minimum o f exposure , the peoplea t these two l o ca t i ons an d Tempiute (popula t ion th ree) , were r e l o ca t eddur ing c loud passage .

Theresults

o f moni to r ing and env i ronmenta lsampling efforts conducted by

th e U. S. P u b l i c Health Serv ice off-Site Radio log ica l Safe ty O rg a n i z a t i o nare p r e s e n t e d in th e fo l lowing r e p o r t .

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Chapte r I

A e r i a l Moni to r ing

Two U. S. A ir Force aircraft and crews were utilized by th e Off -S i t eR a d i o l o g i c a l Safe ty Organiza t ion to provide cloud t racking in format ionfo r P r o j e c t Sedan. One high altitude an d on e low l eve l u n i t was used.In each aircraft, a PHS team o f two moni tors ca r r i ed AN/PDR-39 surveymete rs , Beckman MX-5 su rvey meters , an d an EG&G A er i a l Monitor radiationr e c o r d e r. This combinat ion o f i n s t r u m e n t s enables measurement o f gammar a d i a t i o n intensities from 0 to 50 R p e r hour.

The high altitude aircraft devoted most o f its efforts to cloud pos i t i on ing .The cloud path as de te rmined from th e crew r epo r t s an d o the r ground sourcesis shown in Figure II of Chap te r I. The cloud h e i g h t was e s t i m a t e d at20,000 f e e t Mean Se a Level, and a pass over th e cloud a t 21,500 f e e t MSLa t 1040 hours gave a read ing o f only 1 mr/hr.

The low altitude aircraft chose n o t to pene t r a t e th e cloud until approx i -

mate ly 1500 hours in o r d e r to keep plane con tamina t ion to a minimum. Asummary of the read ings then recorded in th e cloud is presented in Table I.The f i gu re s given have been co r r ec t ed fo r aircraft contamina t ion .

The r e a d i n g s from 1508 to 1536 were recorded on th e EG&G Ae r i a l Monitorr e c o r d e r an d are co r r ec t ed fo r altitude an d aircraft a t t enua t ion . Theseread ings , then, r ep r e sen t ground activity l e v e l s . A ll o t h e r intensityread ings listed in th e t ab l e are n ot c o r r ec t ed fo r a t t enua t ion , and t h e r e -fore show activity l e v e l s i n s i de th e aircraft.

In an effort to obta in an intensity profile of the r ad ioac t i ve cloud, awes t to e a s t pass was flown th rough it a t 1700 hours . Th is s e r i e s ofread ings appears in th e t ab l e from t imes 1652 hours to 1714 hours , an dg i v e s a cloud width o f approx imate ly 55 miles in th e C u r r a n t vicinity.A f t e r loca t ing th e l ead ing edge o f the cloud fifteen m i l e s sou th o f E lya t 1729 hours , th e aerial moni tor ing miss ion was t e rmina ted .

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TABLE I

AERIAL MONITORING RESULTS

PROJECT SEDAN

TIM AZIMUTH, DISTANCE, ELEVATION, LOCATIONGAMS3

DEGREES MILES FEET, MSLmr/hr

1120 360 0 8500 Ground Zero 401435 360 0 5500 Ground Zero 14,0001436 360 0. 5 5500 0. 5 mile north of Ground Zero 10,000

1508 32 36 3 0 0 a 15 miles SE of Queen City Summitover Highway 25 (Koyen's Mill) 3

1510 28 37 300 12 miles SE of Queen City Summitover Highway 25 2

1512 22 38 300 8 miles SE of Queen City Summito v e r Highway 25 3

1514 16 39 300 4 miles SE of Queen City Summitover Highway 25 8

1516 11 40 300 Queen City Summit 201518 6 42 300 4 miles nV of Queen City Summit

over Highway 25 601520 2 44 300 8 miles NW of Queen City Summit

over Highway 25 451522 359 53 300 12 miles NW of Queen City Summit

over Highway 25 (Diablo) 30

1524 35 9 57 30 0 16 m i l e s NW o f Queen Ci ty Summito v e r Highway 25 30

1526 359 61 300 20 miles NW of Queen City Summito v e r Highway 25 25

1528 359 65 300 24 miles NW of Queen City Summitover Highway 25 18




1536 355 72 300 40 miles NW of Queen City Summitover Highway 25 (Twin Springs) 2

1540 12 77 5400 Nyala 251543 13 79 5400 3 m i l e s n o r t h o f Nyala 301545 15 89 5400 B l u e E a g l e Ranch 401555 15 113 5400 C u r r a n t 31652 5 109 12,500 20 miles west of Currant Bkg1654 8 11 0 12,500 15 m i l e s w e s t o f C u r r a n t 71656 10 111 12,500 10 miles west of Currant 10

Note: a = Alt i tudes l i s ted as 300 feet indicate alt i tude above th e surface. Allother readings ar e feet above Mean Sea Level.

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Table IAer ia l Monitoring ResultsProject Sedan

TIME AZIMUTH, DISTANCE, ELEVATION, LOCATION GROSSDEGREES MILES FEET, MSL GAMMA

mr/hr

1658 13 112 12,500 5 miles west of Currant 201700 15 113 12,500 Currant 201700 16 113 12,500 1.25 miles eas t of Currant 41701 16 113 12,500 2.5 miles eas t of Currant 11701 17 114 12,500 3.75 miles eas t of Currant 71702 18 114 12,500 5 miles eas t of Currant 71704 20 116 12,500 10 miles east of Currant 151706 22 117 12,500 15 miles eas t of Currant 51708 25 120 12,500 20 miles eas t of Currant 41710 27 122 12,500 25 miles east of Currant 21712 29 124 12,500 30 miles eas t of Currant 11714 31 127 12,500 35 miles eas t of Currant Bkg

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Chapte r II

Ground Moni to r ing

Eighteen mobile ground moni to r ing teams were used by th e O ff - S i t e Radio-l o g i c a l Safe ty Organ iza t ion dur ing the P r o j e c t Sedan even t . These moni to r swere equipped with P r e c i s i o n Model 111 Scintillators, Beckman MX-5 surveymete r s , Eber l ine E-500B survey mete r s , and AN/PDR-39 survey mete r s . Theseins t rumeats have a range o f 0 to 5 mr /hr, 0 to 20 mr/hr, 0 to 2 ,000 mr /h r,and 0 to 50,000 mr/hr, r e spec t i ve ly. In a d d i t i o n , most teams c a r r i ed add i -t i o n a l air sampling u n i t s , Eber l ine RM-5 r a d i a t i on recorders , and a s tocko f moni to r ing an d sampling s u p p l i e s . Ground u n i t s were in c o n t i n u a l two-way rad io con tac t with C o n t r o l Poin t headquar te r s an d th e c loud p o s i t i o n i n gaircraft.

In o r d e r to prov ide the b e s t documenta t ion o f exposures rece ived by th e o ff -site popula t ion from P r o j e c t Sedan, more emphasis was placed on m o n i t o r i n ga t andin th e vicinity of popu la ted l o c a t i o n s in th e cloud pa th , r a t h e r thanmaking an ove r a l l effort to moni to r all roads cover ing th e v a s t unpopula tedareas .

Figure I on a fo l lowing page shows th e areas monitored on th e day o f P r o j e c tSedan. The pa th o f th e cloud, as documented by ground an d aerial moni to r ing ,and from fallout t r a y a n a l y s i s results, is a lso shown. P a s t exper ience ha sshown t h a t such c louds tend to fol low v a l l e y s between mountain r i d g e s . Thisexpla ins th e "neck ing" effect in th e E ly vicinity.

A f t e r th e cloud passed Ely, a nigh t t ime wind shift ca r r i e d it eas tward . Thisis shown in Figure III o f Chap te r III. Table II p r e s e n t s a d e t a i l e d list ofall ground moni to r ing read ings r ecorded . A ll read ings are th ree f e e t aboveground, u n l e s s otherwise noted. The last page o f th e t a b l e g i v e s a summaryo f all be ta p l u s gamma read ings taken on Ju ly 6, 1962. Some read ings inTable II have been cor rec ted to e l i m i n a t e th e effects of ins t rument an d per-sonne l con tamina t ion dur ing cloud passage. A ll o t h e r read ings were made withclean o r only lightly contaminated ins t ruments . In o r d e r to he lp the readerin r ead ing Table II, Figure II is p r e s e n t e d as an index map. A p o r t i o n ofthis map is div ided in to areas , numbered one through seven. These numbers

correspond to those loca ted in th e upper r i g h t hand c o r n e r of each page inTable II.

The peop le l i v i n g a t Penoyer, Tempiute , and Diablo were not home dur ing th ecloud passage. Those l i v ing a t Twin Spr ings , Nyala, Casey Ranch, Blue EagleRanch, Adaven, Uhalde Ranch, and Pine Creek Ranch s t ayed indoors dur ing th eperiod o f c loud passage . For f u r t h e r in fo rmat ion on these activities, se eChap te r V. During th e t ime t h a t these peop le were indoors , a moni to r wass t a t i o n e d either with the peop le o r in th e immedia te vicinity to documentexposure l e v e l s a t th e l o c a t i o n .

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A summary o f ground m o n i t o r i n g efforts is p r e s e n t e d below. (Some au tomat icr e co r d e r data was a l so used to complete this summary.)

LOCATION CLOUD ARRIVAL CLOUD PEAK PEAK READINGTIME TIME mr/hr

Penoyer 1123 1215 70Tempiute 1145 1400 1.4Diablo 1221 1302 324Pine Creek Ranch 1250 1417 12Adaven and Uhalde Ranch 1320 1435 12Twin Spr ings 1335 1418 30Nyala 1340 1435 16Lockes 1452 1530-1600 5.4Moon River Ranch 1455 1710 2.6Blue Eagle Ranch 1515 1550 6C u r r a n t Maintenance Sta t i on 1623 1738 2.5Lund 1645 1820 2.8Moorman Ranch 1750 1915 3Ruth, Ely, and E a s t E ly 1857 1955 1.2

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MOORMAN RANCH ___ D_0 FMcGILL

EL DORADO1ELY 8 EAST EL7Y

I ~ ~ ~ ~ ~ AED A RASANRECH~I

MANT COYSATOTE C U R A N K O

BELTED EAK* S U S U M M I

Las~~ ~egasomin HOSEJand ~ ~ ~ ~ R A CuneyRageHNCCKSMMT __

RATTLGROOMELAKE

-- MOO RIE2 D K r-T I Nevada IC

IWARMTest7 SPite I

[1 -IABL0

-LEGEND CITT MI

*ee.AD S MONTOEDLWTHDNEGATIV RESLT flE OFFISTTE ARE~'d'CLOUASAGE OUNARIS ROAD MONIORK

HIKO ~ ~~ HO SOUAECTOS0 TEO VN0 n0 ner0 ng HAN0C0SUUY MMIT ILWHA PRGA

SCALE OFILES USPHSLADILGIAE_____________________________ O SAET ORGANIZATIO

GROUND

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MOOMAN RANCH McGILL

EL DORADO KIMBERLY

SI AREA 7 RUTH ELY EAST ELY

/ CURRANT /CURRANT ~MAINTENANCE STATION '-LUND

/ CURRANT '.Yi/ LOCKES // ' OBLUE EAGLE/ / o RANCH

/ RATTLESNAKE AREA 5 OSUNNYSIDE/ _" _- /-I;R__I;R5AREA 1 CASEY MOON RIVER RANCH/ TWIN NYALA CHN6

, S SPRINGS 0 0 R AREAWARMPINS CHERRY CREEK SUMMIT

TONOPAH .. ADAVEN I I

Inneyg 'i OUHALDE RANCHAREA 3 PINE CREEK RANCH,lIIABLO R

0 QUEEN CITY SUMMITGOLDFIELD REED~

-LL "'

I i L

PENOYER 0 -TEMPIUTEBELTED PEAK PASS- I EA 2 HIKO

-~QROCK

HO UE %

SLas Vegas Bombing REAERREDRandunnery Range MAANCOC

_fft 0GROOM LAKEU LM

L 2 GROUND D OU6ZERO P

SCA-E O MILE U S H AILGIA F

SGNevada NI Test Site I

BEATTY L

- L E G E N D - E V E N T P ECT SD#00AREA BOUNDARIES AS REFERRED _____________________

TO IN TABLE n TITLE RE R NCMA

FOR TABLE 110D0 0 0 5 ATE OF EVENT -HR R G A0__10_20__30__40_50 JULY 6, 1962 FPLoWHRPOGA

SCALE OF MILES USPHS RADIOLOGICAL FIGURE___________________________ SAFETY ORGANIZATION IL

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TABLE II Area I

GROUNDMONITORING RESULTS - JULY 6, 1962

PROJECT SEDAN

TIME jAZIMUTH,DISTANCE, lOCATION NET GAMMADEGREES MILES mr/hr

ROCK HOUSE, BELTED PEAK PASS, AND REED AREA1145 6 5 b 8W 23.4 miles south of the Rock House 0c1150 49 10 19.5 miles south of th e Rock House 0.03c

1155 36 13 14.0 miles south of th e Rock House 1.0c1200 29 17 10.9 miles south of the Rock House 5c1205 23 19 7. 4 miles south of the Rock House 20c1207 20 20 6.2 miles south of th e Rock House 50C1210 21 19 5. 3 miles south of the Rock House 1 00c1211 21 19 4 .7 miles south of the Rock House 3001214 21 17 3. 6 miles south of the Rock House 5001222 13 24 0.8 miles south of th e Rock House 8001225 13 25 Rock House 10001234 13 26 2. 0 miles nor th o f th e Rock House 3801243 18 30 Belted Peak Pass Rd. - Valley Rd. Jct . 2001255 15 30 2 .4 miles west o f Valley Rd. - Belted

Peak Pass Rd. Junction 2801258 15 30 2 .7 miles west of Valley Rd. - Belted

Peak Pass Rd. Junction 4401302 12 29 4.2 miles west of Valley Rd. - Belted

Peak Pass Rd. Junction 6001305 10 29 5 .0 miles west of Valley Rd. - Belted

Peak Pass Rd . Junction 6001310 8 29 6.3 miles west of Valley Rd. - Belted

Peak Pass Rd. Junction 7001312 4 29 8 .0 miles west of Valley Rd . - Belted

Peak Pass Rd. Junction 9001318 4 29 8 .7 miles west of Valley Rd . - Belted

Peak Pass Rd. Junction 2201323 357 30 Belted Peak Pass 2001347 352 28 3.1 miles west of Belted Peak Pass 301408 351 26 5.2 miles west of Belted Peak Pass 6 c1416 343 28 8.4 miles west of Belted Peak Pass 0c

1433 349 33 8 .3 miles south o f Reed 0c1443 352 38 3.1 miles south o f Reed 0e1452 354 41 Reed oc1119 10 29 5 .0 miles west of Valley Rd. - Belted Cloud

Peak Pass Junction Arrival1135 10 29 5 .0 miles west of Valley Rd . - Belted Peak of

Peak Pass Junction 15001142 10 29 5 .0 miles west of Valley Rd. - Belted

Peak Pass Junction 1250Notes: b = Azimuth and distance are from Ground Zero

c = These readings have been corrected to eliminate tha t par t of the readingdue to contamination.

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Table II Area 1Ground Monitoring Results - July 6, 1962Projec t Sedan

TIME AZIMUTH, DISTANCE, LOCATION NET GAMMADEGREES MILES mr/hr

ROCK HOUSE, BELTED PEAK PASS, AND REED AREA (CONT'D)1305 10 29 5. 0 miles west of Valley Rd . - Belted

Peak Pass Junction 600

1000 to 65 16 Groom Lake 01545

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Table II Area 2Ground Monitoring Results - July 6, 1962Pro jec t Sedan


QUEEN CITY SUMMIT, PENOYER, TEMPIUTE, AND HANCOCK SUMMIT AREA1046 11 40 Queen City Summit 01130 11 40 Queen City Summit 0

1135 11 40 Queen City Summit 01140 11 40 Queen City Summit 0.041145 11 40 Queen City Summit 0.021150 11 40 Queen City Summit 0.021152 11 40 Queen City Summit 0.101154 11 40 Queen City Summit 0.31156 11 40 Queen City Summit 0.101158 11 40 Queen City Summit 251201 11 40 Queen City Summit 551203 11 40 Queen City Summit 901206 11 40 Queen City Summit 1301210 11 40 Queen City Summit 1601214 11 40 Queen City Summit 1801216 11 40 Queen City Summit 5001220 11 40 Queen City Summit 500

1224 11 40 Queen City Summit 5501228 11 40 Queen City Summit 4751232 11 40 Queen City Summit 4751236 11 40 Queen City Summit 5001240 11 40 Queen City Summit 4501242 11 40 Queen City Summit 1901245 11 40 Queen City Summit 1751249 11 40 Queen City Summit 1651253 11 40 Queen City Summit 1501257 11 40 Queen City Summit 1501263 11 40 Queen City Summit 1451308 11 40 Queen City Summit 1501313 11 40 Queen City Summit 1451317 11 40 Queen City Summit 1351325 11 40 Queen City Summit 1301330 11 40 Queen City Summit 1301337 11 40 Queen City Summit 1251342 11 40 Queen City Summit 1201347 11 40 Queen City Summit 1151352 11 40 Queen City Summit 1101556 11 40 Queen City Summit 802035 11 40 Queen City Summit 34c1157 21 37 8 .0 miles SE of Queen City Summit

on Highway 25 loc

Note: c = These readings have been corrected to el iminate tha t par t of th e readingdue to contamination.

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QUEEN CITY SUMMIT, PENOYER, TEMPIUTE, AND HANCOCK SUMMIT AREA (CONT'D)

1200 18 38 6.1 miles SE of Queen City Summit on Hwy. 25 40c1202 17 38 4. 7 miles SE of Queen City Summit on Hwy. 25 40c

1203 16 38 4. 1 miles SE of Queen City Summit on Hwy. 25 60c1204 15 39 3. 1 miles SE of Queen City Summit on Hwy. 25 70e1205 15 39 2. 7 miles SE of Queen City Summit on Hwy. 25 430c1207 13 39 1.6 miles SE of Queen City Summit on Hwy. 25 4 7 0 c1208 13 39 1.6 miles SE of Queen City Summit on Hwy. 25 1960c1210 14 39 2. 5 miles SE of Queen City Summit on Hwy. 25 760c1215 11 40 0. 6 miles SE of Queen City Summit on Hwy. 25 160c1418 29 36 13.2 miles SE of Queen City Summit on Hwy. 25 0.71421 29 36 12.7 miles SE of Queen City Summit on Hwy. 25 0.71425 28 37 12.1 miles SE of Queen City Summit on Hwy. 25 0.91429 27 37 11.7 miles SE of Queen City Summit on Hwy. 25 1.21431 26 37 11.2 miles SE of Queen City Summit on Hwy. 25 1.51435 26 37 10.7 miles SE of Queen City Summit on Hwy. 25 3.01437 24 37 10.2 miles SE of Queen City Summit on Hwy. 25 3.51440 24

379.7 miles

SE of Queen City Summit on Hwy. 25 5.01443 23 37 9.2 miles SE of Queen City Summit on Hwy. 25 6.01445 23 37 8. 7 miles SE of Queen City Summit on Hwy. 25 9.01448 22 38 8. 2 miles SE of Queen City Summit on Hwy. 25 10.01450 22 38 7.8 miles SE of Queen City Summit on Hwy. 25 141452 21 38 7. 4 miles SE of Queen City Summit on Hwy. 25 501500 20 38 6.8 miles SE of Queen City Summit on Hwy. 25 601507 18 38 5.8 miles SE of Queen City Summit on Hwy. 25 1001511 18 38 5.4 miles SE of Queen City Summit on Hwy. 25 901515 17 38 4.9 miles SE of Queen City Summit on Hwy. 25 901518 16 38 4. 3 miles SE of Queen City Summit on Hwy. 25 1001520 16 39 3. 8 miles SE of Queen City Summit on Hwy. 25 1001525 15 39 3. 3 miles SE of Queen City Summit on Hwy. 25 1101528 14 39 2.8 miles SE of Queen City Summit on Hwy. 25 1151531 14 39 2. 4 miles SE of Queen City Summit on Hwy. 25 1001534 13 39 1. 8 miles SE of Queen City Summit on Hwy. 25 1151536 12 39 1. 3 miles SE of Queen City Summit on Hwy. 25 1151540 12 39 1. 3 miles SE of Queen City Summit on Hwy. 25 951544 11 40 0. 4 miles SE of Queen City Summit on Hwy. 25 1102057 21 38 7 .6 miles SE of Queen City Summit on Hwy. 25 41030 32 36 Tempiute 01045 32 36 Tempiute 01110 32 36 Tempiute 01113 32 36 Tempiute 01130 32 36 Tempiute 0

Note: c = These readings have been corrected to eliminate tha t p a r t of th e readingdue to contamination.

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Table II Area 2Ground M o n i to r i n g R e su l t s - J u l y 6, 1962

P r o j e c t Sedan

TIME AZIMUTHl, DISTANCE, LOCATION NET GAMMADEGREES MILES mr/hr

QUEEN CITY SUMMIT, PENOYER, TEMPIUTE, AND HANCOCK SUMMIT AREA (CONT'D)1145 32 36 Tempiute 0.121146 32 36 Tempiute 0.51147 32 36 Tempiute 0.41149 32 36 Tempiute 0.31151 32 36 Tempiute 0.31155 32 36 Tempiute 0.71200 32 36 Tempiute 0.41210 32 36 Tempiute 0.21215 32 36 Tempiute 0.31220 32 36 Tempiute 0.31230 32 36 Tempiute 0.21245 32 36 Tempiute 0.31340 32 36 Tempiute 0.61350 32 36 Tempiute 0.51355 32 36 Tempiute 0.81400 32 36 Tempiute 1.01107 22 37 Penoyer Oc1123 22 37 Penoyer 0.11c1124 22 37 Penoyer 0.4c1125 22 37 Penoyer 1.5c1127 22 37 Penoyer 2c1129 22 37 Penoyer 4c1132 22 37 Penoyer 5c1137 22 37 Penoyer 18c1138 22 37 Penoyer 3 0 c1140 22 37 Penoyer 20c1142 22 37 Penoyer 20c

1144 22 37 Penoyer 21c1147 22 37 Penoyer 21c1150 22 37 Penoyer 31c

1152 22 37 Penoyer 3 2 c1102 59 41 Hancock Summit 0c

1300 59 41Hancock Summit 0c

1407 59 41 Hancock Summit 0c

2015 59 41 Hancock Summit 0c

N o t e : c T h e s e r e ad ings have b e e n co r r ec t ed to e l i m i n a t e that part o f t he r ead ingdue to contamination.

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Table II Area 3Ground Monitoring Results - July 6, 1962Project Sedan

TIME AZIMUTH, DISTANCE, LOCATION NET GUM/DEGREES MILES Imr/hr

DIABLO AND QUINN WELL AREA1228 5 42 12.0 miles south o f Diablo on Hwy. 25 30001232 3 44 9.8 miles south o f Diablo on Hwy. 25 32001234 1 45 8 .6 miles south of Diablo on Hwy. 25 410c1237 360 47 5 .6 miles south of Diablo on Hwy. 25 310c1240 359 49 3 .6 miles south o f Diablo on Hwy. 25 170c

1247 359 53 Diablo 21001252 359 55 2. 5 miles north of Diablo on Hwy. 25 220c

1254 359 57 5.1 miles north of Diablo on Hwy. 25 17001257 359 61 7. 9 miles north of Diablo on Hwy. 25 140c1259 359 63 10.9 miles north of Diablo on Hwy. 25 140C1300 3 64 Quinn Well 0c1305 3 64 Quinn Well 0.6c1308 3 64 Quinn Well 1.0c1312 3 64 Quinn Well 3.0c1319 357 68 8 .0 miles NW of Quinn Well ( Jc t . with Hwy.25) 1.001455 355 43 10.6 miles south of Diablo on road to Reed 33c1500 355 45 9.2 miles south o f Diablo on road to Reed 48c

1503 356 46 8 .0 miles south of Diablo on road to Reed 6301518 356 49 4 .9 miles south of Diablo on road to Reed 5801527 359 53 0. 5 miles due west of Diablo 40c1537 359 55 2.3 miles north of Diablo 40c1540 359 56 3. 1 miles north o f Diablo on Hwy. 25 6001545 359 59 7.1 miles north of Diablo on Hwy. 25 33c1553 359 64 12.1 miles north of Diablo on Hwy. 25 1601555 4 43 11.8 miles south of Diablo on Hwy. 25 951610 3 43 10.3 miles south of Diablo on Hwy. 25 1001612 3 44 9.8 miles south of Diablo on Hwy. 25 1001615 2 44 9.2 miles south of Diablo on Hwy. 25 1001618 2 44 8 .7 miles south of Diablo on Hwy. 25 751622 1 45 8. 1 miles south o f Diablo on Hwy. 25 801626 1 46 7.3 miles sou th o f Diablo on Hwy. 25 601629 360 46 6 .6 miles south of Diablo on Hwy. 25 701633 360 47 5. 8 miles south of Diablo on Hwy. 25 651635 359 48 4 .9 miles south of Diablo on Hwy. 25 601638 359 48 4.3 miles south of Diablo on Hwy. 25 601642 359 49 3 .6 miles south of Diablo on Hwy. 25 651645 359 50 2. 8 miles south o f Diablo on Hwy. 25 601648 359 51 2. 2 miles south of Diablo on Hwy. 25 601650 359 52 1.2 miles south of Diablo on Hwy. 25 602010 359 56 3.1 miles north of Diablo on Hwy. 25 28c2018 359 53 Diablo 26c

Note: c = These readings have been corrected to el iminate tha t par t of the readingdue to contamination.

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TIME IAZIMUTH, DISTANCE, LOCATION NET GAMMADEGREES MILES mr/hr

DIABLO AND QUINN WELL AREA ( CONT'D)1018 359 53 Diablo 0c

1219 359 53 Diablo 0c1221 359 53 Diablo 0 . 2 1 c1223 359 53 Diablo 0.36c1225 359 53 Diablo 0,46c1227 359 53 Diablo 0 .6 6 c1229 359 53 Diablo 1.3c1230 359 53 Diablo 7 .5c1231 359 53 Diablo 8.1c1233 359 53 Diablo 8.6c1234 359 53 Diablo 9.1c1235 359 53 Diablo 10.7c1237 359 53 Diablo 12c1239 359 53 Diablo 1 8 C1240 359 53 Diablo 30c1243 359 53 Diablo 50c1245 359 53 Diablo 72c1247 359 53 Diablo 72c1250 359 53 Diablo 129c1252 359 53 Diablo 2 1 0 c1253 359 53 Diablo 210c1255 359 53 Diablo 210c1257 359 53 Diablo 250c1300 359 53 Diablo 2 8 8 c1301 359 53 Diablo 2 8 8 c1302 359 53 Diablo 324c1303 359 53 Diablo 324c1306 359 53 Diablo 3 0 5 c1309 359 53 Diablo 2 6 9 c1314 359 53 Diablo 2 3 0 c1321 359 53 Diablo 210c1322 359 53 Diablo 192c

1327 359 53 Diablo 172c1330 359 53 Diablo 1 7 2 c1333 359 53 Diablo 155c1339 359 53 Diablo 1 2 9 c1359 359 53 Diablo 100C1408 359 53 Diablo 83c1412 359 53 Diablo 7 2 c1425 359 53 Diablo 67c1437 359 53 Diablo 67C1444 359 53 Diablo 5 6 c1455 359 53 Diablo 67c

Note: c = These readings have been corrected to eliminate tha t p a r t of th e readingdue to contamination.

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TIME AZIMUTH, DISTANCE, LOCATION NET GMkvADEGREES MILES mr/hr

DIABLO AND QUINN WELL AREA (CONT'D)1505 359 53 Diablo 61c1512 359 53 Diablo 61c

1518 359 53 Diablo 56C1525 359 53 Diablo 60C1530 359 53 Diablo 56C1536 359 53 Diablo 56C1541 359 53 Diablo 52C1548 359 53 Diablo 52C1600 359 53 Diablo 52c1615 359 53 Diablo 50c1630 359 53 Diablo 49c1650 359 53 Diablo 40c1703 359 53 Diablo 40c1717 359 53 Diablo 36c1730 359 53 Diablo 35c1746 359 53 Diablo 36c1801 359 53 Diablo 36c1816 359 53 Diablo 36c1830 359 53 Diablo 36C1850 359 53 Diablo 32c1902 359 53 Diablo 30c1920 359 53 Diablo 29C1930 359 53 Diablo 28c1946 359 53 Diablo 2 8 c2018 359 53 Diablo 25.5c

Note: c = These readings have been corrected to eliminate t h a t par t of the readingdue to contamination.

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TIME AZIMUTH, DISTANCE, LOCATION NET GAMMADEGREES MILES I mr/hr

TWIN SPRINGS, WARMSPRINGS, LOCKES, AND CURRANT AREA

1000 355 72 Twin Springs 0

1100 355 72 Twin Springs 01200 355 72 Twin Springs 01230 355 72 Twin Springs 01245 355 72 Twin Springs 01300 355 71 Twin Springs Turnoffd 01335 355 71 Twin Springs Turnoffd 0.031345 355 71 Twin Springs Turnoffd 0.031350 356 70 3 .0 miles SE of Twin Springs Turnoff 3.51405 355 71 Twin Springs Turnoffd 201408 355 71 Twin Springs Turnoffd 451409 355 71 Twin Springs Turnoffd 501410 355 71 Twin Springs Turnoffd 601412 355 71 Twin Springs Turnoffd 651413 355 71 Twin Springs Turnoffd 681414 355 71 Twin Springs Turnoffd 901415 355 71 Twin Springs Turnoffd 951418 355 72 Twin Springs 301420 355 71 Twin Springs Turnoffd 1001422 355 72 Twin Springs 181430 355 72 Twin Springs 81440 355 72 Twin Springs 61445 355 71 Twin Springs Turnoffd 1 4c1450 355 71 Twin Springs Turnoffd IOc1512 355 72 Twin Springs 2c1525 355 71 Twin Springs Turnoffd 2c1535 355 71 Twin Springs Turnoffd 2c1600 355 71 Twin Springs Turnoffd 2c1430 355 72 1.0 mile west of Twin Springs Turnoff i2.9c1435 353 73 2 .0 miles west of Twin Springs Turnoff 2.4c

1440 352 73 3 .0 miles west of Twin Springs Turnoff 1 .9c1440 351 73 4 .0 miles west of Twin Springs Turnoff 0.8c1445 351 73 5 .0 miles west of Twin Springs Turnoff 0.3c1447 350 73 6. 0 miles west of Twin Springs Turnoff 0.3c1450 349 73 7 .0 miles west of Twin Springs Turnoff 0.3c1455 348 73 8 .0 miles west of Twin Springs Turnoff 0.35c1458 348 73 9.0 miles west of Twin Springs Turnoff 0.3C1500 347 74 Warm Springs 0.4c1510 348 75 2 .0 miles north of Warm Springs on Hwy.6 0.1c1514 349 77 4 .0 miles north of Warm Springs on Hwy.6 0.01c

Notes: c = These readings have been corrected to el iminate tha t par t of th e readingdue to contamination.

d = Twin Springs Turnoff is one mile SE of Twin Springs a t Highway 25.

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TWIN SPRINGS, WARM SPRINGS, LOCKES, AND CURRANTAREA (CONT'D)1517 350 78 6 .0 miles north of Warm Springs on Hwy. 6 0.01c1520 351 79 8 .0 miles north of Warm Springs on Hwy. 6 0.01c1523 352 81 10.0 miles north of Warm Springs on Hwy. 6 0c

1526 352 83 12.0 miles north of Warm Springs on Hwy. 6 0.02c1530 353 84 14.0 miles north of Warm Springs on Hwy. 6 0.02c1533 354 86 16.0 miles north of Warm Springs on Hwy. 6 0.02c1536 355 88 18.0 miles north of Warm Springs on Hwy. 6 0.04c1538 356 89 20.0 miles north of Warm Springs on Hwy. 6 0.04c1542 356 90 Ratt lesnake 0.22c1600 356 90 1 .0 mile NE of Rattlesnake on Hwy. 6 0.22c1603 358 91 3 .0 miles NE of Ratt lesnake on Hwy. 6 0.5c1606 359 92 5 .0 miles NE of Ratt lesnake on Hwy. 6 0.9c1610 360 92 7 .0 miles NE of Ratt lesnake on Hwy. 6 1.9c1613 1 91 9 .0 miles NE of Ratt lesnake on Hwy. 6 4.8c1618 2 90 13.4 miles SW of Lockes on Hwy. 6 6.9c1623 3 91 11.4 miles SW of Lockes on Hwy. 6 6 .9c1628 4 93 9. 4 miles SW of Lockes on Hwy. 6 7 .4c1632 5 94 7 .4 miles SW of Lockes on Hwy. 6 5.9c1655 6 95 5.4 miles SW of Lockes on Hwy. 6 2.9c1658 7 96 3.4 miles SW of Lockes on Hwy. 6 3.9c1700 8 97 1.4 miles SW of Lockes on Hwy. 6 1.9c1704 8 98 Lockes 1.9c1745 7 96 2 .5 miles SW of Lockes on Hwy. 6 2.9c1820 356 90 Ratt lesnake 0.2c1830 354 85 6.0 miles south of Rattlesnake on Hwy. 6 0.2c1300 8 98 Lockes 0c c1325 8 98 Lockes 0c1440 4 93 9.0 miles SW of Lockes on Hwy. 6 0.14c1450 7 96 3 .0 miles SW of Lockes on Hwy. 6 0.09c1500 8 98 Lockes 0.08c1515 8 98 Lockes 3.0c1525 8 97 1.2 miles SW of Lockes on Hwy. 6 3.4c1530 7 96 2 .6 miles SW of Lockes on Hwy. 6 4.2c1545 7 96 2 .6 miles SW of Lockes on Hwy. 6 4.2c1600 7 96 2. 6 miles SW of Lockes on Hwy. 6 4.1c1615 7 96 2. 6 miles SW of Lookes on Hwy. 6 3.1c1620 15 113 Currant 11627 7 96 2. 6 miles SW of Lockes on Hwy. 6 2 .9c1635 15 113 Currant 11640 15 113 Currant 41645 7 96 2 .6 miles SW of Lockes on Hwy. 6 2.6c

Note: c = These readings have been corrected to eliminate tha t p a r t of the readingdue to contamination.

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Table IIGround Monitoring Results - July 6, 1962Pro jec t Sedan

TIME I AZIMUTH, DISTANCE, LOCATION NET GAMDEGREES MILES mr/hr

TWIN SPRINGS, WARM SPRINGS, LOCKES, AND CURRANT AREA (CONT'D)1650 15 113 Currant 61700 15 111 2. 0 miles SW of Currant on Highway 6 91705 15 110 3. 0 miles SW of Currant on Highway 6 101707 14 109 4. 0 miles SW of Currant on Highway 6 101708 14 108 5. 0 miles SW of Currant on Highway 6 91709 14 107 6. 0 miles SW of Currant on Highway 6 91711 14 106 7. 0 miles SW of Currant on Highway 6 81712 13 105 8. 0 miles SW of Currant on Highway 6 71713 13 105 9.0 miles SW of Currant on Highway 6 61714 13 104 10.0 miles SW of Currant on Highway 6 61715 12 103 11.0 miles SW of Currant on Highway 6 51715 8 98 Lockes 2.5c1717 12 103 12.0 miles SW of Currant on Highway 6 4.51721 11 101 14.0 miles SW of Currant on Highway 6 41722 11 100 15.0 miles SW of Currant on Highway 6 31723 10 100 16.0 miles SW of Currant on Highway 6 2.51724 10 100 17.0 miles SW of Currant on Highway 6 2.51725 9 99 18.0 miles SW of Currant on Highway 6 31726 8 99 19.0 miles SW of Currant on Highway 6 31730 8 98 Lockes 21745 8 98 Lockes 21748 9 99 2. 0 miles NE of Lockes on Highway 6 21750 10 100 3 .0 miles NE of Lockes on Highway 6 1.51751 10 100 4 .0 miles NE of Lockes on Highway 6 21752 11 100 5. 0 miles NE of Lockes on Highway 6 1.51753 11 100 6.0 miles NE of Lockes on Highway 6 11754 11 101 7. 0 miles NE of Lockes on Highway 6 11755 12 103 8. 0 miles NE of Lockes on Highway 6 11756 12 103 9. 0 miles NE of Lockes on Highway 6 11757 12 103 10.0 miles NE of Lockes on Highway 6 11758 13 104 11.0 miles NE of Lockes on Highway 6 11759 13 105 12.0 miles NE of Lockes on Highway 6 0.5

1800 14 106 13.0 miles NE of Lockes on Highway 6 11801 14 107 14.0 miles NE of Lockes on Highway 6 11802 14 108 15.0 miles NE of Lockes on Highway 6 1.51803 14 109 16.0 miles NE of Lockes on Highway 6 1.51805 15 110 17.0 miles NE of Lockes on Highway 6 1.51806 15 Ill 18.0 miles NE of Lockes on Highway 6 1.51807 15 112 19.0 miles NE of Lockes on Highway 6 1.51809 15 112 20.0 miles NE of Lockes on Highway 6 1.51810 15 113 Currant 1

Note: c = These readings have been corrected to el iminate tha t p a r t of the readingdue to contamination.

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TIME AZIMUTH, DISTANCE, LOCATION NE T GAMMADEGREES MILES mr/hr

TWIN SPRINGS, WARM SPRINGS, LOCKES, AND CURRANT AREA (CONT'D)1811 15 113 1. 0 miles NE of Currant on Highway 6 21812 16 114 2. 0 miles NE of Currant on Highway 6 1.5

1813 16 115 3 .0 miles NE of Currant on Highway 6 21814 16 116 4 .0 miles NE of Currant on Highway 6 21815 16 117 5. 0 miles NE of Currant on Highway 6 21815 7 96 2. 6 miles SW of Lockes on Highway 6 1.91817 17 118 6.0 miles NE of Currant on Highway 6 1.51818 17 118 7.0 miles NE of Currant on Highway 6 11819 17 119 8 .0 miles NE of Currant on Highway 6 1.51820 17 119 Currant Maintenance Station 1.51822 18 120 2.0 miles NE of Currant Maintenance Station 1.51823 18 120 3. 0 miles NE of Currant Maintenance Station 2.51824 19 120 4.0 miles NE of Currant Maintenance Station 2.51856 19 121 Currant Summit 1.51900 20 125 37.0 miles SW of Ely on Highway 6 1.51905 20 130 32.0 miles SW of Ely on Highway 6 1.51908 20 135 27.0 miles SW of Ely (Gardner Turnoff) 2.51915 20 140 22.0 miles SW of Ely on Highway 6 31919 20 145 17.0 miles SW of Ely on Highway 6 2.51925 21 150 12.0 miles SW of Ely on Highway 6 2.51936 22 154 5. 0 miles SW of Ely on Highway 6 22030 15 113 Currant 1.5

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Table Il Area 5Ground Monitor ing R e s u l t s - Ju ly 6, 1962P r o j e c t Sedan

TIME AZIMUTH, DISTANCE,,ERE IELO0CATION NE T GAMMAm/h

BLUE EAGLE RANCH, NYALA, AND ADAVEN AREA1500 15 89 Blue Eagle Ranch 01503 15 89 Blue Eagle Ranch 01515 15 89 Blue Eagle Ranch 0.09

1520 15 89 Blue Eagle Ranch 0.371530 15 89 Blue Eagle Ranch 1.01534 15 89 Blue Eagle Ranch 31540 15 89 Blue Eagle Ranch 51550 15 89 Blue Eagle Ranch 61610 15 89 B l u e Eagle Ranch 61620 15 89 B l u e Eagle Ranch 51640 15 89 Blue Eagle Ranch 51700 15 89 Blue Eagle Ranch 31330 12 77 Nyala 01340 12 77 Nyala 0.021350 12 77 Nyala 0.021355 12 77 Nyala 0.121400 12 77 Nyala 0.471405 12 77 Nyala 0.871410 12 77 Nyala 0.771415 12 77 Nyala 1.71420 12 77 Nyala 71425 12 77 Nyala 101430 12 77 Nyala 121435 12 77 Nyala 161440 12 77 Nyala 13

(Moved inside house at this time; a ll succeeding readings are indoors.)1445 12 77 Nyala 101450 12 77 Nyala 91500 12 77 Nyala 101515 12 77 Nyala 81530 12 77 Nyala 71540 12 77 Nyala 4.51550 12 77 Nyala 3.51600 12 77 Nyala 3.51615 12 77 Nyala 3.21630 12 77 Nyala 3.01645 12 77 Nyala 2.81700 12 77 Nyala 2.61715 12 77 Nyala 2.61730 12 77 Nyala 2.51745 12 77 Nyala 2.4

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TIME AZIMUTH, I DISTAN~CE, I LCATION NET GAMMADEGREES MILES mr/hr

BLUE EAGLE RANCH, NYAIA, AND ADAVEN AREA (CONT'D)

1220 17 78 Cherry Creek Summit 01230 17 78

Cherry Creek Summit 01320 20 71 Adaven 0.41325 21 71 1. 0 mile eas t of Adaven 1.21328 22 69 Uhalde Ranch 1.41332 22 69 Uhalde Ranch 3.21335 22 68 1. 0 mile south of Uhalde Ranch 4.91337 22 68 1. 9 mile south of Uhalde Ranch 6.01340 22 67 2. 8 miles south of Uhalde Ranch 3.01343 22 65 4. 7 miles south of Uhalde Ranch 1.81350 22 64 5. 9 miles south of Uhalde Ranch 4.61357 20 62 Pine Creek Ranch 6.01400 20 62 Pine Creek Ranch 6.01405 20 62 Pine Creek Ranch 5.51409 20 62 Pine Creek Ranch 81413 20 62 Pine Creek Ranch 91414 20 62 Pine Creek Ranch 101415 20 62 Pine Creek Ranch 111417 20 62 Pine Creek Ranch 121420 20 62 Pine Creek Ranch 121423 20 62 Pine Creek Ranch 101425 20 62 Pine Creek Ranch 61427 20 62 Pine Creek Ranch 91432 20 62 Pine Creek Ranch 101435 20 62 Pine Creek Ranch 121440 20 62 Pine Creek Ranch 101447 20 62 Pine Creek Ranch 121450 20 62 Pine Creek Ranch 101455 20 62 Pine Creek Ranch 91500 20 62 Pine Creek Ranch 71508 20 62 Pine Creek Ranch 61520 20 62 Pine Creek Ranch 61530 20 62 Pine Creek Ranch 51545 20 62 9.6 miles south of Uhalde Ranch 51608 20 62 8 .0 miles south of Uhalde Ranch 3.81618 22 68 1. 6 miles south of Uhalde Ranch 31623 22 69 Uhalde Ranch 41630 20 71 Adaven 41705 17 78 Cherry Creek Summit 41735 15 79 Casey Ranch 41830 15 79 Casey Ranch 2.5

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Table IIGround Monitoring Results - July 6, 1962Pro jec t Sedan

TIME AZIMUTH, DISTANCE, LOCATION NET GAMMADEGREES MILESI mr/hr

SUNNYSIDE, LUND, AND MOON RIVER RANCH AREA1455 28 97 0.7 miles west of Moon River Ranch 0.0821459 28 97 1.0 miles west of Moon River Ranch 0.28c

1505 28 96 1.5 miles west of Moon River Ranch 0.38c1509 28 96 1.5 miles west of Moon River Ranch 0.78C1515 28 96 1.5 miles west of Moon River Ranch 0.78F1520 28 96 1.5 miles west of Moon River Ranch 0.58F1525 28 96 1.5 miles west of Moon River Ranch 0.5801530 28 96 1.5 miles west of Moon River Ranch 0.73F1535 28 96 1 .5 miles west of Moon River Ranch 1.6c-1540 28 96 1.5 miles west of Moon River Ranch 1.6c1545 28 96 1. 5 miles west of Moon River Ranch 1.8c1553 29 97 Moon River Ranch 1.7c1600 29 97 Moon River Ranch 1 . 7 c1605 29 97 Moon River Ranch 2 .6c1610 29 97 Moon River Ranch 1. 6 c1620 29 97 Moon River Ranch 1 . 6 c1630 29 97 Moon River Ranch 1 .2c1640 29 97 Moon River Ranch 1.6c1650 29 97 Moon River Ranch 2 . 1 c1700 29 97 Moon River Ranch 1.6c1710 29 97 Moon River Ranch 2. 6 c1720 29 97 Moon River Ranch 1. 6 c1730 29 97 Moon River Ranch 1 . 6 c1740 29 97 Moon River Ranch 1 .5c1750 29 97 Moon River Ranch 1 . 5 c1800 29 97 Moon River Ranch 1.5c1810 29 97 Moon River Ranch 1 .6c1820 29 97 Moon River Ranch 1.6c1830 29 97 Moon River Ranch 1 .4c1840 29 97 Moon River Ranch 1 . 4 c

1900 31 104 Sunnyside 0.8c1915 34 97 10.0 miles south of

Sunnyside 0.201930 37 88 20.0 miles south of Sunnyside 0c1942 43 85 30.0 miles south of Sunnyside 0c1955 47 78 40.0 miles south of Sunnyside 0c0900 25 129 Lund 01130 25 129 1.0 mile south of Lund 01230 24 131 2 .0 miles north of Lund 01300 24 131 2 .5 miles north of Lund 01330 25 129 0.5 miles south of Lund 01400 25 129 0.5 miles south of Lund 0

1430 25 129 0. 5 miles south of Lund 0

Note: c These readings have been corrected to el iminate tha t par t of th e readingdue to contamination.

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Table IIGround Monitoring Results - July 6, 1962Projec t Sedan

TIME AZIMUTH, DISTANCE, LOCATION NE T GAIM&DEGREES MILES mr/hr

SUNNYSIDE, LUND, AND MOON RIVER RANCH AREA (CON'T)1500 25 129 0.5 miles south of Lund 01530 25 129 0 .5 miles south of Lund 01600 25 129 0 .5 miles

southof

Lund 01630 25 129 0.5 miles south o f Lund 0.121645 25 129 0 .5 miles south o f Lund 0.141655 25 129 0.5 miles south of Lund 0.291700 25 129 0.5 miles south of Lund 0.391705 25 129 0.5 miles south of Lund 0.491710 25 129 0.5 miles south of Lund 0.591720 25 129 0.5 miles south of Lund 0.691730 25 129 0.5 miles south of Lund 1.01740 25 129 0.5 miles south of Lund 1.11750 25 129 0 .5 miles south of Lund 1.31800 25 129 0 .5 miles south of Lund 1.61810 25 129 0 .5 miles south of Lund 2.51820 25 129 0.5 miles south of Lund 2.81830 25 129 0.5 miles south of Lund 2.61840 25 129 Lund 2.2

Instrument used in th e Lund vic in i ty was an Eberl ine E-500B survey meter.

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ELY AND MOORMAN RANCH AREA1730 13 156 Moorman Ranch 0C1750 13 156 Moorman Ranch 0.3c1800 13 156 Moorman Ranch 0.3c

1810 13 156 Moorman Ranch 0.5c1815 13 156 Moorman Ranch 0.7c1820 13 156 Moorman Ranch 0 . 9 c1825 13 156 Moorman Ranch 1. 0 c1830 13 156 Moorman Ranch 1.3c1900 13 156 Moorman Ranch 2. 0 c1905 14 158 2. 1 miles eas t of Moorman Ranch 2.0c1915 13 156 Moorman Ranch 3. 0 c1930 13 156 Moorman Ranch 2.9c1940 13 156 Moorman Ranch 2. 0 c1950 13 156 Moorman Ranch 1.6c2005 8 158 19.1 miles west of Moorman Ranch 1.1c2020 4 153 El Dorado 0. 5 c1730 22 156 East El y 0 c1850 20 155 Kimberly

0c

1855 20 155 Kimberly 0 c1857 21 155 Ruth 0.6c1900 21 157 2 miles NE of Ruth 0.7c1908 23 156 Ely 0.6c1913 22 156 East El y 0 . 8 c1920 22 156 East El y 0.9c1930 22 171 McGill 0.7c1940 22 166 5. 0 miles south of McGill 1 . 1 c1947 22 156 East El y 1.1c1955 22 156 East El y 1.2c2025 21 157 Junction of Hwys. U.S. 50 and Nev. 44 1.2c2140 22 156 East Ely 0 . 7 c0145 22 156 East Ely 0. 6 c1910 to 5 255 Elko 0e

2140

Notes: c = These readings have been corrected to el iminate tha t par t of th e readingdue to contamination.

e = Elko is not shown in Figure I or II. Refer to Figure I I I in Chapter I I I .

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Table IISummary of Beta + Gamma Readings - Ju ly 6, 1962P r o j e c t Sedan

INET BETATIME AZIMUTH, DISTANCE, LOCATION GAMIA

DEGREES MILES mr/hr

1512 355 72 Twin Spr ings (o n ground) 4.51600 35 5 71 Twin Spr ings Turno ff (o n ground) 4.01640 15 89 Blue Eag le Ranch 7.5

1650 15 113 C u r r a n t 11

1745 12 77 Nyala 182010 35 9 56 3 .1 mi l e s n o r t h o f Diab lo 1062018 35 9 53 Diab lo 1082035 11 40 Queen City Summit 1212057 21 38 7.6 miles SE of Queen City Summit 14

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Chapter III

Ground Remonitoring

On th e days following th e Project Sedan event, ground monitors carr iedou t a remonitoring survey to determine th e extent of radioactive depo-s i t ion from th e cloud passage. The resul ts of th is survey are given inTable I I I . A ll readings ar e three fee t above th e ground unless otherwisenoted.

In addit ion to th e table, Figure III is also given to show th e roadsremonitored and the area of res idual act ivi ty thus documented. Due toth e small scale of th e map, th e names of a ll locations mentioned inTable I I I could niot be shown. Reference to e i the r Figure I or Figure II

of Chapter II wil l show any locations mentioned in th e table .

The Projec t Sedan cloud was l a s t located at Ely on th e day of th e event.That night, an apparent wind sh i f t carried it in an eas ter ly d i rec t ion ,as shown by ground remonitoring data.

No remonitoring data was obtained on th e highway going eas t from Ely.As a r e su l t th e southern edge of th e act ivi ty pat tern in tha t vic in i tyis no t known. An estimated edge is shown on th e map.

Remonitoring indicated a small act ivi ty r ise five miles west of Warm Springsand f i f teen miles west of Viendover on July 7th and Lth. This is probably

due to loca l background var ia t ions , ra ther than Projec t Sedan residual.

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TABLE III

GROUND REMONITORING RESULTS - JULY 7, 1962

PROJECT SEDAN

AZIMUTH, DISTANCE, LOCATION NET GAMA N A M I ATIME DEGREES MILES mr/hr mr/hr

HIGHWAY 25 ; WARM SPRINGS TO DIABLO TO COYOTE SUDMIT0810 344 73 4. 3 miles west of Warm Springs Of0815 347 74 Warm Springs 00828 354 73 9. 3 miles eas t of Warm Springs 0

0833 355 72 Twin Springs 0.510710 355 72 21.4 miles N1 of Diablo on Hwy. 25 1. 0 4.0f0855 355 72 21.0 miles NW of Diablo on Hwy. 25 1.10716 356 70 19.0 miles NW of Diablo on Hwy. 25 4. 0 15.50915 357 69 16.8 miles NW of Diablo on Hwy. 25 3.60720 357 68 16.0 miles NW of Diablo on Hwy. 25 4. 0 16.50726 358 65 12.0 miles NW of Diablo on Hwy. 25 (.5 >200730 358 62 9. 0 miles NW of Diablo on Hwy. 25 8.00735 359 59 6.0 miles NW of Diablo on Hwy. 25 10.00739 359 56 3.0 miles NW of Diablo on Hwy. 25 11.50745 359 53 Diablo 11.0 P500814 359 50 3.0 miles SE of Diablo on Hwy. 25 10.00816 360 47 6.0 miles SE of Diablo on Hwy. 25 10.00821 2 44 9. 0 miles SE of Diablo on Hwy. 25 18.00827 11 40 Queen City Summit 15.00855 13 39 2. 0 miles SE of Queen City Summit 17.00900 17 38 5.0 miles SE of Queen City Summit 10.00905 22 38 8. 0 miles SE of Queen City Summit 2.0 6.00935 22 37 Penoyer 2.0 9.50940 23 37 9. 0 miles SE of Queen City Summit 1.0 3.50947 24 37 10.0 miles SE of Queen City Summit 0. 3 1.50950 31 36 14.2 miles SE of Queen City Summit 0 01006 37 35 Coyote Summit 0 Of0930 32 36 Tempiute 1.01333 359 53 Diablo 10f

HIGHWAY 25 to NYAIA TO ADAVEN TO HIGHWAY 250915 357 68 Jc t . of Hwy.25 & Nyala Road - 22.0 miles

SW7 of Nyala 3.G 11.31245 357 68 Je t . of Hwy. 25 & Nyala Road - 22.0 miles

SW of Nyala 3.50921 1 69 17.0 miles SW of Nyala 2.5 8.01455 2 69 16.0 miles SW of Nyala 2.0g1453 2 70 15.0 miles S-' of Nyala 1.7g0932 5 70 12.0 miles SW of Nyala 2.2 7.71448 6 70 10.0 miles S1 of Nyala 0.991445 7 72 8.0 miles SWV of Nyala 1.1g

Notes: f = These f igures for HWY. 25 have been corrected fo r instrument contamination.g eadinjsearecfrom 8,3ckman b-5 suryey m e t e r . .g rre ecnman ,- rem ins. 5 lXY er readings in this section ar eEberl ine E-500B survey meter readings.

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Table IIIGround Remonitoring Results - July 7, 1962Project Sedan

AZIMUTH, D I T N E E A NET BETA

TIME DEGREES MILES LOCATION Tr h AMMA A

I I mr/hrHIGHVAY 25 to NYALA TO ADAVEN TO HIGHWAY 25 (CONT'D)

0940 8 73 7.0 miles SW of Nyala 2.6 7.51442 9 73 5.0 miles SW of Nyala 1.5g1440 10 74 4.0 miles SW of Nyala 1.2g0947 11 76 2 .0 miles SW of Nyala 3.3 5.51431 12 76 1.0 mile SW

of Nyala 1.0g 2.31431 12 76 1.0'mile SW of Nyala (on ground) 4.00957 12 77 Nyala 2.3 4.51425 12 77 Nyala 0.791409 13 80 4.0 miles north of Nyala 0.9g1008 14 80 5.0 miles north of Nyala 2.01020 15 79 Casey Ranch 1.3 2.81043 17 79 5.0 miles eas t of Casey Ranch 2.2 3.51047 17 78 Cherry Creek Summit 1.8 3.01117 20 71 Adaven 1.5 2.51113 22 69 Uhalde Ranch 1.5 2.01200 22 65 5. 0 miles south of Uhalde Ranch 1.0 1.81210 20 62 Pine Creek Ranch 1.0 1.81235 20 61 25.1 miles NE of Hwy.25, Penoyer turnoff

(0.9 miles SW of Pine Creek Ranch) 1.0 2.01244 22 55 20.1 miles NE of Hwy.25, Penoyer turnoff 1.2 2.01255 23 48 13.8 miles NE of Hwy.25, Penoyer tu rnoff 3 .0 5.01300 .25 46 12.1 miles NE of Hwy.25, Penoyer turnoff 5.5 10.51303 26 44 10.1 miles NE of Hwy.25, Penoyer turnoff 5. 5 10.01308 27 42 7.6 miles NE of Hwy. 25, Penoyer turnoff 9.0 17.01315 29 40 5.1 miles NE of Hwy. 25, Penoyer turnoff 10.81320 30 38 2. 6 miles NE of Hwy. 25, Penoyer turnoff 9 .0 17.01325 32 36 Hwy. 25, Penoyer turnoff 10.0

DUCKWATER TO NYAIA, VIA CURRANT(Readings ar e from a Beckman MX-5 Survey Meter)

1146 9 120 Duckwater (on ground) 5.01157 10 120 2.0 miles SE of Duckwater 0.81200 11 118 5.0 miles SE of Duckwater 1.01202 12 117 7.0 miles SE of Duckwater 0.6

1205 12 116 9.0 miles SE of Duckwater 0.51256 16 102 10.0 miles S of Currant on Nyala Road 0. 7 1.31256 16 102 10.0 miles S of Currant on Nyala Rd.(on ground) 3.01300 16 100 12.0 miles S of Currant on Nyala Road 0.81303 16 99 13.0 miles S of Currant on Nyala Road 0.71308 16 96 16.0 miles S of Currant on Nyala Road 0.71346 16 93 19.0 miles S of Currant on Nyala Road 0.71353 15 89 24.0 miles S of Currant on Nyala Road 0.71400 14 85 28.0 miles S of Currant on Nyala Road 0.71405 14 82 32.0 miles S of Currant a t Cherry Crk. Rd.Jct . 0.7

Note: g = These ar e Beckman MX-5 readings. A ll other readings in th is section ar eEberl ine E-500B survey meter readings.

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A ISTNE NET G A M A NET BETATIM .AZIIUTH,ISTANCE, LOCATION Imr/hr GAMMPm/hTIME DEGREES MILES mrh

HIGHWAY 6: ELY TO WARM SPRINGS(Readings ar e from a Beckman MX-5 Survey Meter)

0905 23 156 El y 0 .4 1.00916 22 156 Jct . Hwy. 6 & 50, west to Ely 0.41127 22 156 Jct . Hwy. 6 & 50, west to El y 0.40920 22 154 2.0 miles S of Highway 6 & 50 Junction 0.40922 22 154 3 .0 miles S of Highway 6 & 50 Junction 0.40923 22 154 4. 0 miles S of Highway 6 & 50 Junction 0.50926 21 153 5.0 miles S of Highway 6 & 50 Junction 0.40931 20 150 7.0 miles S of Highway 3 & 50 Junction 0.50935 20 147 10.0 miles S of Highway 6 & 50 Junction 0.40943 20 142 16.0 miles S of Highway 6 & 50 Junction 0.50955 20 139 23.0 miles S of Highway 6 & 50 Junction 0.41010 20 134 28.0 miles S of Highway 6 & 50 Junction 0.41018 20 129 33.0 miles S of Highway 6 & 50 Junction 0.41032 20 125 37.0 miles S of Highway 6 & 50 Junction 0.41050 17 119 41.0 miles S of Hwy.6&50 Jct . (Currant

Maintenance Station) 0.51100 17 118 6.0 miles NE of Currant 0.4

1105 15 113 Currant 0.71312 15 113 Currant 0.61315 15 11 2.0 miles SW of Currant 0.71318 14 109 4 .0 miles SW of Currant 0.91321 14 107 6.0 miles SW of Currant 0.61327 13 105 8.0 miles SW of Currant 0.51330 13 104 10.1 miles SW of Currant 0.81333 12 103 12.2 miles SW of Currant 0.81338 10 100 16.2 miles SW of Currant 0.71344 8 98 Lockes 0.81400 7 95 4. 1 miles SW of Lockes 0. 9 1.61410 5 94 8 .1 miles SW of Lockes 1.21417 3 91 12.1 miles SW of Lockes 1.41421 1 91 16.1 miles SW of Lockes 0.51426 359 92 20.1 miles SW of Lockes 0.11430 356 90 24.1 miles SW of Lockes 0.031435 355 88 27.1 miles SW of Lockes 0.121441 353 84 32.1 miles SW of Lockes 0.031448 350 79 38.1 miles SW of Lockes 0

LUND & SUNNYSIDE AREA(Readings ar e from a Beckman MX-5 Survey Meter)

0955 20 135 13.0 miles north of Lund 0.751005 22 133 6.0 miles north of Lund 0.751010 25 129 Lund 0.651020 26 123 7.0 miles south of Lund 0.65

17 1 4 17.0 miles south of Lund 0.5530 107 27.0 miles south of Lund 0.35

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TI M AZIMUTH, DISTANCE, NET GAMMA GANETBADEGREES MILES LOCATION mr/hr Mrh

LUND & SUNNYSIDE AREA (CONT'D)(Readings ar e from a Beckman MX-5 Survey Meter)

1050 31 104 Sunnyside 0.251055 32 101 3.0 miles south of Sunnyside 0.251115 34 97 10.0 miles south of Sunnyside 0.15 0.3

1132 37 88 20.0 miles south of Sunnyside 0.03 0.021252 43 85 30.0 miles south of Sunnyside 0 0.021215 47 78 40.0 miles south of Sunnyside 0.02 0.021234 49 68 50.0 miles south of Sunnyside 0 01255 51 58 60.0 miles south of Sunnyside 0 01320 58 50 70.0 miles south of Sunnyside 0 0

EIKO, WELLS, CURRIE, AND WENDOVER AREA(Readings ar e from a Beckman MX-5 Survey Meter)

0910 2 163 Eureka 00920 2 158 4.3 miles SE of Eureka 00937 4 153 El Dorado 0.220954 9 157 15.2 miles eas t of El Dorado 0.421000 10 157 19.8 miles eas t of El Dorado 0.421015 13 156 Moorman Ranch 0.42

1040 13 162 6 miles north of Moorman Ranch 0.421109 15 162 24 miles NW of Ely 0.37

0630- Elko to Wells to 21 miles south of0830 Wells 0

0930 13 250 32 miles north of Currie on Highway 93 00945 15 240 22 miles north of Currie on Highway 93 01000 17 234 12 miles north of Currie on Highway 93 01013 18 231 7 miles north of Currie on Highway 93 0.041020 18 229 5 miles north of Currie on Highway 93 0.041035 18 228 3 miles north of Currie on Highway 93 0.031045 19 225 Currie 0.031100 20 224 3 miles south of Currie 0.031130 20 226 2 miles north of Currie 0.031135 18 228 3 miles north of Currie 0.031140 18 229 4 miles north of Currie 0.031145 18 229 5 miles north of Currie 0.03 0.111150 18 230 6 miles north of Currie 0.03 0.081155 18 231 7 miles north of Currie 0.03 0.061200 18 232 8 miles north of Currie 0.03 0.111205 17 232 9 miles north of Currie 0.03 0.081210 17 233 10 miles north of Currie 0.02 0.061340 19 225 Currie 0.031344 20 224 3 miles south of Currie 0.051348 20 223 6 miles south of Currie 0.03 0.06

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Table IIIGround Remonitoring Results - July 7, 1962Pro jec t Sedan

TDE AZIMUTH, DISTANCE,INETGA M NE T BET,

TIM DEGREES MILES Lr/hTION mr/hr 1 r/hrELO, VELLS, CURRIE, AND WENDOVER AREA (CONT'D)(Readings ar e from a Beckman MX-5 Survey Meter)

1352 21 221 9 miles south of Currie 0.03 0.061355 21 218 12 miles south of Currie 0.03 0.041400 22 217 Jct . of Hwy. 93 & Alt.50, south of Currie 0.03 0.03

23 220 5 miles N ofth e

junction, onHwy. Alt . 50 0.03 0.06

23 225 10 miles N of th e junction, on Hwy. Alt . 50 0.03 0.0623 229 15 miles N of th e junction, on Hwy. Alt . 50 0.03 0.0623 234 20 miles N of th e junction, on Hwy. Alt . 50 0.03 0.0424 238 25 miles N of th e junction, on Hwy. Alt . 50 0.03 0.0424 241 30 miles N of th e junction, on Hwy. Alt . 50 0.03 0.0425 246 35 miles N of th e junction, on Hwy. Alt . 50 0.03 0.0425 251 40 miles N of th e junction, on Hwy. Alt . 50 0.01 0.0524 256 45 miles N of th e junction, on Hwy. Alt . 50 0.02 0.02

1600 24 261 50 miles N of th e junction, on Hwy. Alt . 50 0 0.0124 266 55 miles N of th e junction, on Hwy. Alt . 50 0.01 024 270 Wendover 0 025 271 5 miles eas t of Wendover 0 026 273 9 miles eas t of Wendover 0 024 270 Wendover 0 0

23 269 5 miles west of Wendover 022 272 10 miles west of Wendover 022 272 11 miles west of Wendover 0.0122 274 15 miles west of Wendover 0.01

approx.1730 21 276 20 miles west of Wendover 0 0

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Table IIIGround Remonitoring Results - July 8, 1962Projec t Sedan

AZIMTH, ET ~ NE T BETAI DISTANCEI GETGAMMTIME DEGREES MILES LOCATION mr/hr mr/hI I mr/hr

TONOPAH TO TEMPIUTE, VIA WARM SPRINGS AND DIABLOh

1000 315 90 Tonopah 01100 344 73 5 miles west of Warm Springs 0.031400 32 36 Tempiute 0.051415 21 37 8 miles SE of Queen City Summit 0.7

1425 22 37 Penoyer 0.81450 15 38 4 miles SE of Queen City Summit 4.41455 11 40 Queen City Summit 3.41510 6 42 4 miles NV of Queen City Summit 2.91515 359 48 5 miles SE of Diablo 3.11525 359 53 Diablo 2.91535 359 58 5 miles NW of Diablo 2.51540 358 63 10 miles N1? of Diablo 2.21545 357 68 15 miles NW of Diablo 1.01550 356 70 17 miles NW of Diablo 0.91600 355 71 Twin Springs Turnoff 0.31620 355 72 Twin Springs 0.31625 355 72 1 mile west of Twin Springs 01630 352 73 5 miles west of Twin Springs 01635 347 74 Warm Springs 01650 343 73 5 miles west of Warm Springs 0.011655 340 74 10 miles west of Warm Springs 0

Note: h = A ll readings in th is section ar e from an Eberl ine E500-B Survey Meter.

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Table II IGround Remonitoring Results - July 9, 1962Pro jec t Sedan

IAZIMUTH, DISTANCE NET GAMMA NET BETA

TIME DEGREES MILES LOCATION mr/hr GAMMAIII mr/hr

HIGHWAY 25: TEMPIUTE TO WARM SPRINGSi1230 32 36 Tempiute 0.05 0.101240 21 37 8 miles SE of Queen City Summit 0.53 1.31250 16 38 4 miles SE of Queen City Summit 4.0 9.01300 11 40 Queen City Summit 4. 0 8.01310 6 42 4 miles NW of Queen City Summit 4. 0 10.01345 359 53 Diablo 2.0 6.01500 359 56 2. 7 miles NW of Diablo 1.7 5.51530 355 72 Twin Springs 0.18 0.42

1520 22 37 Penoyer 0.371540 32 36 Tempiute 01545 22 37 9 miles SE of Queen City Summit 0.071552 14 39 3 miles SE of Queen City Summit 1.51559 11 40 Queen City Summit 1.31610 6 42 4 miles NY of Queen City Summit 1.41710 359 53 Diablo 1.01725 358 63 10 miles NW of Diablo 0.91735 356 70 18 miles NW of Diablo 0.51742 355 71 Twin Springs Turnoff 0.12

1752 355 72 Twin Springs 0.041758 354 73 2 miles west of Twin Springs 01610 347 74 Warm Springs 01115 50 10 23.5 miles south of th e Rock House 01130 36 13 14.5 miles south of th e Rock House 0.11 0.181140 26 18 8.5 miles south of th e Rock House 0.33 0.631150 18 21 4.5 miles south of th e Rock House 7. 0 16.01200 13 25 Rock House 17.0 801210 19 30 6. 9 miles north of th e Rock House 4. 0 10.0

1427 52 10 24 miles south of th e Rock House 01432 48 10 18 miles south of th e Rock House 0.031438 36 13 14 miles south of th e Rock House 0.071445 26 18 9 miles south of th e Rock House 0.171500 13 24 1 mile south of th e Rock House 12.0

1502 13 25 Rock House 10.01507 17 29 5 miles north of th e Rock House 4.01509 19 30 7 miles north of th e Rock House 2.5

1615 65 16 Groom Lake 01617 65 15 1 mile west of Groom Lake 01629 65 11 5 miles west of Groom Lake 0

Note: i This sect ion contains Eberl ine E-500B Survey Meter readings. The readings ofind iv idua l instruments ar e l i s ted in separate groups.

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AZIMUTH, DISTANCE, NET GAMMA NE T BETATIME1DISAN~rLOCAIONGAMMATDEGREES MILES L Tmr/hr mr/hr

HIGHWAY 25: TEMPIUTE TO WARM SPRINGSi (CONT'D)1632 65 10 6 miles west of Groom Lake 01640 65 9 8 miles west of Groom Lake 01643 65 8 31 miles south of th e Rock House 01651 65 8 29 miles south of th e Rock House 0

1656 58 9 27 miles south of th e Rock House 0.011700 53 9 25 miles south of th e Rock House 0.021705 49 9 23 miles south of th e Rock House 0.081738 18 30 Valley Road-Belted Peak Road Junction 3.51744 18 30 1 mile west of junction 5.01746 16 30 2 miles west of junction 4.51749 14 30 3 miles west of junction 8.81752 12 29 ' 4 miles west of junction 10.51757 11 29 5 miles west of junction 10.51800 9 29 6 miles west of junction 13.61804 7 29 7 miles west of junction 13.51807 5 29 8 miles west of junction 10.01810 4 29 8.7 miles west of junction 4.51815 2 29 9. 7 miles west of junction 4.4

1818 360 29 10.7 miles west of junction 4.51823 358 29 11.7 miles west of junction 1.01827 356 30 12.7 miles west of junction 0.81829 355 29 13.7 miles west of junction 0.91832 353 28 14.7 miles west of junction 0.61836 351 28 15.7 miles west of junction 0.951840 349 29 16.7 miles west of junction 1.21843 348 29 17.7 miles west of junction 1.551846 345 29 18.7 miles west of junction 1.71849 348 29 19.7 miles west of junction 1.51853 347 29 20.7 miles west of junction 0.48

Note: i = This section contains Eberline E-500B Survey Meter readings. The readings ofind iv idua l instruments ar e l i s ted in separate groups.

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Table IIIGround Remonitoring Results - July 10, 1962Pro jec t Sedan

IAZIMUTH,DISTANCE, NE T GALUhIA NET BETATIME DEGREES MILES LOCATION mr/hr GAMMA

SI I Imr/hrOFF-SITE AREA

0942 22 37 Penoyer 0. 4 0.70942 22 37 Penoyer (on ground) 0.5 1.70956 11 40 Queen City Summit 1. 6 4.50956 11 40 Queen City Summit (on ground) 3. 0 8.01010 359 53 Diablo 1.1 1.91010 359 53 Diablo (on ground) 1. 4 3.01150 32 36 Tempiute 01035 355 72 22 miles N?! of Diablo 0.51022 355 71 Twin Springs Turnoff 0.051010 347 74 Warm Springs 01115 355 72 22 miles NW of Diablo at Hwy.25-Nyala Rd.Jct. 0. 5 1.21130 2 70 7 miles NE of th e Junction 0.4 0.951145 9 74 17 miles NE of th e Junct ion 0.35 0.81150 12 77 Nyala 0.20 0.61400 15 79 Casey Ranch 0.35 0.451830 20 62 Pine Creek Ranch 0.20 0.351315 8 98 Lockes 0.31330 11 102 7 miles NE of Lockes on Highway 6 0.41400 16 102 10 miles south of Currant on Nyala Road 0.351500 16 96 15 miles south of Currant on Nyala Road 0.151600 15 89 Blue Eagle Ranch 0.101730 9 120 Duckwater 0.081830 15 113 Currant 0.101030 22 134 Gardner Ranch 0.031200 17 119 Currant Maintenance Station 0.051230 16 116 4 miles NE of Currant 0.051330 24 129 Lund 0.031430 31 104 Sunnyside 0

Note: All readings on th e tenth were taken with e i ther a Beckman MEX-5 Survey Meter oran Eberline E-500B Survey Meter.

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Chapter IV

Recorder Chart Data

Reference to Figure VI of Chapter X wil l show th e locat ions of six EberlineRM-5 radia t ion recorders used to record cloud passage gamma act ivi ty fromth e Project Sedan event. These continuous recorders have a logari thmicscale recording range from 0.01 mr/hr to 100 mr/hr, and ru n fo r a periodof twenty-four hours per chart .

The accompanying Figure IV shows reproductions of th e char t data obtainedfrom th e recorders. These curves should no t be used to determine anyexposure doses. This information can be found in Chapter VI.

Specia l note: The recorder at Diablo was reading low by a f ac to r of s ix .A ground monitor s ta t ioned a t this locat ion recorded an actual peak readingof 324 mr/hr.

Th e Diablo and Twin Springs curves in par t i cu la r indicate s l igh t r i ses inactivity during the nighttime hours. This is theorized as being due toth e airborne ac t iv i ty near th e surface becoming more concentrated by atype of atmospheric inversion layer. The ac t iv i ty r ise indicated a t th eend of th e Diablo curve is due to this effect .

The er ra t ic act ivi ty at Groom Lake was due to dust from th e Sedan cra terbeing wind borne in t ha t direct ion overnight.

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w 200

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Chapter V

Safe ty Measures

In o r d e r to keep an y r a d i a t i o n exposure to th e off-site p o p u l a t i o n a t aminimum, s e v e r a l precaut ionary measures were taken by th e O ff -S i t eR a d i o l o g i c a l Safe ty Organiza t ion dur ing P r o j e c t Sedan.

With th e a id of Nevada Sta t e Highway Pat ro lmen , roadb locks were se t upon Highway 25 a t Hancock Summit (1102 hours to 1620 hours ) and Twin Spr ings(1130 hours to 1625 hours ) dur ing cloud passage. A f t e r th e cloud had

passed Highway 25 and th e roadb locks were lifted, a record of each v e h i c l een t e r i n g th e area of r e s i d u a l r a d i a t i o n was logged and its d e s c r i p t i o n

passed to th e o t h e r roadblock v i a r a d i o . Mhen t h e v e h i c l e a r r i v e d atth e next roadblock p o s i t i o n , it was moni to red fo r gamma and beta-gammacon tamina t ion . F ive v e h i c l e s were washed with water to r educe th econ tamina t ion l eve l s on th e tires and wheel w e l l s after they ha d passedth rough th e area . The bodies o f t h e s e v e h i c l e s were con tamina ted on lylightly, and th e r emainder of th e veh i c l e s d id n o t pick up enough contam-i na t i on to warran t washing.

The gross activities on th e f i v e washed v e h i c l e s were as fo l lows:

Vehic le 41 1 150 mr/hr 7 200 mr/hr P+7 before washing40 mr/hr 7 140 mr/hr P+7 after washing

Vehic le #2 90 mr/hr 7 before washing13 mr/hr y 60 m r / h r P+7 after washing

Vehic le #3 80 mr/hr 7 before washing11 mr/hr y 38 m r / h r P+y after washing

Vehic le #4 17 mr/hr 7 before washing8 m r / h r y 26 m r / h r P+y after washing

Vehic le #5 15 mr/hr y before washing4 mr/hr y 16 m r / h r 0+7 after washing

In add i t i o n to th e roadb lock measures , th e people l i v ing a t Diab lo , Penoyer,and Tempiute were contac ted before th e even t and to ld of th e a n t i c i p a t e dr e l ea se and subsequen t activities. Then, on th e da y of th e P r o j e c t Sedanevent , they were r e l o c a t e d dur ing the cloud passage . The Diab lo p o p u l a t i o nleft from 1145 to 0030 hours , Penoyer from 1000 to 2300 hours , and Tempiutefrom 1054 to 1320 hours .

Also , th e peop le a t Twin Spr ings , Casey Ranch, Nyala , and Blue Eagle Ranchwere asked to remain i n d o o r s fo r th e pet iod of c loud passage, as were those

a t Adaven, Uhalde Ranch, and Pine Creek Ranch. A summary of t h e s e measuresappears below, and moni to r r e a d i n g s a t these l o ca t i o ns appear in Table IIof Chapter II.

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S.... ....... .. ..... Pe'ri'od indoors orLoca t ion Number of R e s i d e n t s PelocatndReloca ted

Diab lo 4 a d u l t s , 4 c h i l d r e n 1145 - 0030Tempiute 3 a d u l t s 1000 - 2300Penoyer 2 a d u l t s 1054 - 1620Tvin Spr ings 10 a d u l t s , 2 c h i l d r e n 1415 - 1535Nyala 3 a d u l t s , 2 c h i l d r e n 1420 - 1i00Casey Ranch 3 a d u l t s 1330 - 1735Blue Eagle Ranch 4 a d u l t s , 6 c h i l d r e n 1445 - 1615Adaven 3 a d u l t s 1320 - 1630Uhalde Ranch 2 a d u l t s , 3 c h i l d r e n 1330 - 1623Pine Creek Ranch 3 a d u l t s , 1 chi ld 1345 - 1700

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SChapter VI

Est imated Exposure Doses

Th e fo l lowing s t eps were used to e s t i ma t e gamma exposure doses to l oca t i onst h a t were in the pa th of th e r ad ioac t i ve cloud resulting from the Pro jec tSedan even t .

1. Due to th e usage o f different i n s t r u m e n t s a t different t imes inth e same l oca t i ons , and because it was i m p o s s i b l e to calibrate a lli n s t r u m e n t s immediately p r i o r to use, some discontinuities appear inl og - l o g p lo t s of remoni tor ing da t a r e a d i n g s . Therefore , th e groundmoni tor ing data and au tomat ic r e c o rd e r da t a was combined, and th emost r e a s o n a b l e r e a d i n g s p lo t t ed on l og - l o g paper. .

2. A decay f a c t o r was de te rmined from th e most reliable curves. Thesewere computed to be:

Diab lo t- 1 . 2 1 Penoyer t - 1 . 0 1

Lockes t- 1 . 1 9 Pine Creek Ranch t- 1I 0 9

Nyala t - 0 .99 Twin Spr ings t-1 . 0 1

3. On curves fo r l oca t i ons l ack ing sufficient d a t a , an arbitrarydecay f a c t o r o f t- 1 . 1 was used to extend th e l og - l og p l o t to on ehundred hours after zero t ime (1000 hours , Ju ly 6, 1932).

4. With va lues picked from t h e s e l o g - l og p l o t s , an a r i t hme t i c plo tof th e activity a t a l oca t i on was completed. These curves are shownon th e fo l lowing pages and are cons idered to be most i nd i ca t ive ofth e ac tua l activities a t those l oca t i ons .

5. Th e area under t h e s e curves was plan imete red to obta in th e exposuredosage fo r th e first on e hundred hours after zero t ime.

6. An infinite dose from th e on e hundred hour t ime was computed u s i n ga t- 1 . 2 decay f a c t o r. The t - 1 . 2 f a c t o r was used here to provide ac o n s e r v a t i v e decay characteristic.

7. The sum of th e curve area exposure and th e computed infinite exposureis given he re in as th e total exposure dose a t t h a t l oca t i on .

In r e f e r enc e to th e curves on the fo l lowing pages:

Only on e remoni tor ing o b s e r v a t i o n was ava i l ab l e fo r Lund, and a log- logp l o t of this seemed to i nd i ca t e a t oo - r a p i d decay in comparison witho the r l oca t i ons . Therefore , th e Lund curve has been a d j u s t e d tocor respond wi th th e o the r s and th e exposure from th e a d j u s t e d curveused. This is r e p r e s e n t e d by th e broken l i ne on th e p lo t .

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As s t a t e d in Chap te r V, th e peop le a t Diab lo , Tempiute , and Penoyerwere r e - l o c a t e d dur ing cloud passage. The t ime o f r e s i d e n t returnis noted on their r e s p e c t i v e curves .

ALL EXPOSURE RATES SHOW11N AR E ABOVE 0.03 m r / h r BACKGROUND.

SUMMARY OF FSTIMATED INFINITE EXPOSURE DOSES

LOCATION EXPOSURE TO INFINITE DOSE TOTAL INFINITE10 0 HOURS mr FROM 10 0 HOURS mr EXPOSURE DOSE mr

Blue Eagle Ranch 63 110 173Curran t 16 30 46E ly 25 60 85Lockes 43 50 93Lund 41 65 106Moon River Ranch 25 30 55Moorman Ranch 36 35 101Nyala 78 100 178Pine Creek Ranch 33 100 163

I Twin Spr ings 57 65 122

ESTITATED EXPOSURE DOSES AT RESIDENT RELOCATION POINTS

EXPOSURE TO EXPOSURE FROM INFINITE TOTAL RESIDENTL RESIDENT RESIDENT RETURN DOSE FROM INFINITE

RETURN TO 100 HOURS 100 HOURS EXPOSURE DOSEDiablo 6I0 420 525 945Penoyer 10G 7S 150 22 3Tempiute 2 .5 7 15 22

As it wa s imposs ib le to acqu i re d a t a a t each i n d i v i d u a l ranch house in th ecloud passage a rea , activity o b s e r v a t i o n s were recorded a t either on e ranchin th e c lose vicinity of others , o r th e moni to r t r a v e l e d from on e house toth e o t h e r in t h e s e ranch groups .

There fo re , no p r e c i s e exposure d a t a is a v a i l a b l e fo r each i n d i v i d u a l r anch .However, th e es t ima ted exposure dose a t on e l o c a t i o n migh t wel l be i n d i c a t i v eof th e exposure a t ano the r. For ins tance , th e Pine Creek Ranch exposu re mightbe r e l a t e d to th e Adaven and Uhalde Ranch l o c a t i o n s ; th e Nyala to th e CaseyRanch; th e Lund to th e Gardne r Ranch; th e Curran t Maintenance S t a t i o n toCurran t ; th e E ly to E a s t E ly and Ruth ; th e Moon River Ranch to Sunnyside .

The reader should a l so keep in mind t h a t a t s e v e r a l of these l o c a t i o n s , th er e s i d e n t s remained indoors dur ing cloud passage. This would tend to reducetheir a c t u a l exqposure dose. Refe r to Chap te r V.

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Chapte r VII

Film Badges

In c o n j u n c t i o n with th e c o n t i n u i n g p u b l i c relations program be ing c a r r i e do u t by th e U. S. Publ ic Heal th Serv ice in th e O ff - S i t e area , and in effortsto de te rmine p e r s o n a l and community exposures by dos imet ry measures , DuPonttype 556 dos imete r f i lm packe t s were worn by genera l popula t ion i n d i v i d u a l sdur ing the P r o j e c t Sedan event .

In the fo l lowing t ab l e s , a summary is presen ted of all film badges worndur ing th e P r o j e c t Sedan per iod which i n d i c a t e d exposures t h a t might bedue to th e passage of th e SEDAN cloud. A l l o t h e r film badges worn byi n d i v i d u a l s a t l o c a t i o n s n ot in th e cloud pa th ind ica ted zero exposure or

h e a t damage dur ing the P r o j e c t Sedan per iod .

Table IV lists th e process ing results of p e r s o n a l film badges . It isq u e s t i o n a b l e if th e exposures a t Hiko a re du e to P r o j e c t Sedan. A ll othe rexposures listed should be a result o f SEDAN to vary ing degrees . Theh i g h e s t exposure o f 275 mr was on the f i lm badge of a r e s i d e n t a t GardnerRanch. However, two o t h e r r e s i d e n t s a t th e r anch rece ived 05 mr and 90 mraccord ing to their film badges . Some of th e 275 mr exposure may be heatdamage. The n e x t h i g h e s t film badge exposure was 200 mr, worn by a r e s i d e n tof Nyala.

Table V lists th e results of " c o n t r o l " badges . These badges a re p laced onb u i l d i n g s o r t r e e s to prov ide a comparison fo r p e r s o n a l badges worn in th earea .

Table VI lists th e exposures rece ived on station badges . The exposure isan average of f i v e badges suspended th ree f e e t above th e ground a t th el o c a t i o n s i n d i c a t e d .

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TABLE IV

PERSONAL FILM BADGESPROJECT SEDAN

INDIVIDUALWOCATION WEARING DATES WORN mr

BADGE EXPOSURE

Adaven Female Adult 6/20 - 7/10 40Adaven Male Adult 6/20 - 7/10 70Adaven Male Adult 6/20 - 7/10 85Blue Eagle Ranch Female Adult 7/4 - 7/10 75Blue Eagle Ranch Male Adult 7/4 - 7/10 85Blue Eagle Ranch Male Adult 7/4 - 7/10 125Blue Eagle Ranch Male Adult 7/4 - 7/10 115Blue Eagle Ranch Female Child 7/4 - 7/10 85Blue Eagle Ranch Female Child 7/4 - 7/10 105Blue Eagle Ranch Female Child 7/4 - 7/10 80Blue Eagle Ranch Male Child 7/4 - 7/10 150Casey Ranch Female Adult 6/20 - 7/10 70Casey Ranch Male Adult 6/20 - 7/10 70Casey Ranch Male Adult 6/20 - 7/10 105C u r r a n t Maintenance Sta . Male A d u l t 7 /3 - 7/10 70

C u r r a n t Maintenance Sta . Male A d u l t 7 /3 - 7/10 65Diablo Male A d u l t 6/19 -7/9 170Diablo Male A d u l t 6/19 - 7/9 150Duckwater Male A d u l t 7 /2 - 7/10 0Duckwater Male A d u l t 7 /4 - 7/10 80Duckwater Male Adul t 7 /4 - 7/10 80Duckwater Male A d u l t 7 /3 - 7/10 115E ly Male Adul t 7 /2 - 7/12 90E ly Male A d u l t 7 /2 - 7/12 85E ly Male A d u l t 7 /2 - 7/10 50E ly Male Adul t 6 /26 - 7/24 80E ly Male A d u l t 6/25 - 7/11 80E ly Male Adul t 7 /3 - 7/10 45E ly Male Adul t 7 /2 - 7/12 80E ly Male A d u l t 6/25 - 7/11 90E ly Male A d u l t 7 /2 - 7/10 55E ly Male A d u l t 7 /2 - 7/11 65E ly Male Adul t 7 /2 - 7/12 75E ly Male Adul t 7 /2 - 7/10 65E ly Male A d u l t 6/26 - 7/24 90E ly Male A d u l t 7 /2 - 7/10 55

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Table IVPersonal Film BadgesProjec t Sedan

INDIVIDUALLOCATION WEARING DATES WORN mr

BADGE EXPOSURE

Gardner Ranch Male Adult 7/ 2 - 7/11 275Gardner Ranch Male Adult 7/ 3 - 7/11 90Gardner Ranch Male Adult 7/ 3 - 7/11 85Hiko Female Adult 7/1 - 7/23 55Hiko Male Adul t 7 /1 - 7/23 55Lockes Male Adult 7/4 - 7/10 110Lund Male A d u l t 7 /2 - 7/11 70Lund Male Adul t 7 /2 - 7/11 65Lund Male Adult 6/19 - 7/11 60Lund Male Adult 6/19 - 7/11 70Manzonie Ranch (4 miles

NE of Currant) Male Adult 7/4 - 7/10 75Manzonie Ranch Male Adult 7/3 - 7/10 110Manzonie Ranch Male Adult 7/ 3 - 7/10 70Manzonie Ranch Male Adult 7/3 - 7/10 100Manzonie Ranch Male Adult 7/3 - 7/10 80Manzonie Ranch Male Adult 7/3 - 7/10 75Nyala Female Adult 6/20 - 7/10 55Nyala Female Adult 6/20 - 7/10 70Nyala Female Adul t 6/20 - 7/10 75

Nyala Male Adult 6/19 - 7/10 85Nyala Male Adult 6/19 - 7/10 105Nyala Male Adult 6/20 - 7/10 200Nyala Male Adult 6/19 - 7/10 160Nyala Male Adult 6/20 - 7/10 85Nyala Male Child 6/20 - 7/10 170Penoyer Male Adult 6/ 6 - 7/19 0Penoyer Male Adult 6/ 8 - 7/19 170Pine Creek Ranch Female Adult 6/20 - 7/10 220Pine Creek Ranch Male Adult 6/20 - 7/10 125Ratt lesnake Male Adult 6/19 - 7/20 60Ratt lesnake Male Adult 6/19 - 7/20 65

Sunnyside Male Adult 7/2 - 7/11 50Troy Mine (4 miles SW of

Blue Eagle Ranch) Female Adult 6/19 - 7/10 30Troy Mine Male Adult 6/19 - 7/10 55Troy Mine Male Adult 6/19 - 7/10 65Twin Springs Female Adult 6/19 - 7/10 35Twin Springs Female Adult 6/19 - 7/10 130Twin Springs Male Adult 6/19 - 7/ 9 110Warm Springs Male Adult 6/19 - 7/19 50Warm Springs Male Adult 6/19 - 7/19 50

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TABLE V

CONTROL FILM BADGESPROJECT SEDAN

LOCATION OBJECT DATES EXPOSED EO rEXPOSURE

Blue Eagle Ranch Tree 7/4 - 7/10 115Blue Eagle Ranch Fence 7/4 - 7/10 160Currant Tree 7/3 - 7/11 100Currant Tree 7/4 - 7/10 90Currant Maintenance Station Fence 7/3 - 7/11 150Duckwater Pole 7/3 - 7/10 130Gardner Ranch Tree 7/3 - 7/11 90Hiko Roof 3/21. - 9/3 0Hiko Shed 7/1 - 7/23 55Lockes Tree 7/4 - 7/10 a60Lund Roof 7/2 - 7/11 70Manzonie Ranch (4 miles NE of

Currant) Tree 7/3 - 7/10 90Shell O il Site (10 miles S of

Currant) Tree 7/4 - 7/10 165

SunnysidePost 7/2 - 7/11 55

Sunnyside Fence 7/2 - 7/11 65

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TABLE VI

STATION FILM BADGESPROJECT SEDAN

LOCATION DATES EXPOSED EXPOSURE

Diablo 6/29 - 7 /9 1322Hot Creek Ranch 6/19 - 7/20 50Penoyer 6/29 - 7/10 83

Pine Creek Ranch 6/20 - 7/10 215R a t t l e s n a k e 6/19 - 7/20 1408 m i l e s E a s t o f Reed * 6/29 - 7 /9 2625Simpson Ranch 6/20 - 7/10 115Uhalde Ranch 6/20 - 7/10 140Warm Spr ings 6/29 - 7/9 59

* Reed is no t a popula ted l o c a t i o n and should n o t be used in a t t e m p t s tode te rmine exposures to th e off-site p o p u l a t i o n .

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Chapte r VIII

F a l l o u t Trays

Standard 8" x 10" meta l fallout t r ays placed t h r ee f e e t above th e groundwere used fo r th e P r o j e c t Sedan even t . Th e t rays were co l l ec t ed on D+lo r earlier an d counted fo r gross beta and s p e c i f i c gamma i so top i c activity.Th e gamma activities were then e x t r ap o l a t e d to t ime o f peak c loud passageu s i n g At = Aoe-At, and th e gross beta activity ex t r apo l a t ed g raph ica l l yto peak cloud passage t ime. The gross beta decay curves exh ib i t e d essen-tially th e same characteristics as those drawn fo r air filter decays. SeeChapte r X. The ex t r apo l a t ed va lues a re shown in the fo l lowing t ab l e an df i gu re .

As shown in Figure V, fallout t r ay numbers on e th rough fifty-five wereplaced in a rough arc o f thirty-five to fo r ty miles r ad iu s from GroundZero. Reference to Figure I in Chapte r 1I w i l l give a relative positiono f th e arc in th e off-site area. F igure V gives a l og a r i t hm ic p l o t o f th ee x t r apo l a t ed gross b e t a activity on each t r ay in th e arc. The numericalva lues o f th e activity are listed in Table VII. U n f o r t u n a t e l y, a herdo f cattle managed to des t roy some o f th e t r ays between Reed an d QueenCity Summit, the reby caus ing a break in data c o n t i n u i t y. The graph tendsto i nd i ca t e cloud edges a t Coyote Summit and tw o miles e a s t o f Cedar Pass,w i t h some poss ib l e n i g h t t i m e smearing o f activity between s take numbersforty-five an d fifty-five.

Ten microcur ies p e r square meter might beassumed as an average background va lue fo r gross b e t a activity c o l l e c t e don a fallout t ray a t th e t imes an d l oca t i ons listed in Table VII.

The results o f ganmma spec t roscopy ana lys i s o f th e fallout t r ays are a l sop r e s e n t e d i n Ta b l e VII. The first sec t i on d e a l s wi th th e fallout t r aysplaced in th e above mentioned arc , an d th e last page lists results f r omt r a y s placed a t spec i f i c l oca t i ons in th e cloud p a t h .

One irregularity is e v i d e n t a t th e Eureka station. Gross beta activity was120 Lc/M 2 , th e same as in Ely, whi le th e i so top i c ana lys i s ind i ca t e s noactivity. Ground moni tor ing in th e area placed th e wes t edge of the c louda few miles e a s t o f Eureka. Thus, th e 120 Lc/M 2 gross beta activity f i gu refo r t h a t station may be er roneous .

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TABLE VII

FALLOUT TRAY RESULTS

PROJECT SEDAN

TRAY NUMBER AZIMUTH, DISTANCE, TIME-DATEI.c/M2

AND/OR DEGREES MILES COLLECTION At 1130 Hours. 7-6-62

LOCATION GS 140 1r9BETA 1131 11331 1135 1Te 1 3 2 140lRul 0 3 lNb 9 5

1 343 42 1943-7/5 5 .02 D ND .04 ND .01 ND(Cedar Pass) 1416-7/7

2 344 42 1945-7/5 15 .04 D ND .75 .03 .0 2 ND

1430-7/7

3 345 41 1947-7/5 5 .02 D ND .04 ND .01 ND1410-7/7

4 346 41 1950-7/5 14 .04 D ND .08 ND ND ND1405-7/7

5 347 41 1952-7/5 20 .03 D ND ND ND ND ND1445-7/7

6 348 41 1955-7/5 30 .04 D ND .07 4 .01 .01 ND1350-7/7

7 349 41 1957-7/5 220 .03 D ND .07 .02 < .01 ND1630-7/7

8 351 41 2000-7

pne 200 sedan

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