rt 123 introduction & review of radiation protection (merrills ch. 2) wk #3
TRANSCRIPT
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RT 123INTRODUCTION & Review of
Radiation Protection(Merrills Ch. 2)
WK #3
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MARIE & PIERRE CURIE
• 1898
• “NAMED RADIOACTIVITY”
• DEVELOPED A RADIATION DETECTOR
• 1914 (WW1) DEVELOPED A MOBILE RADIOGRAPHY X-RAY “CAR” TO TAKE XRAY IN THE BATTLE FRONTS
• TRAINED 150 “TECHNICIANS” TO OPERATED CARS
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Early measurement of Radiation
• Skin dryness & erythema– AKA radiodermatitis
• Ulcers formed
• Cataracts• Cancers
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DIAGNOSTICRADIOLOGY
• STATIC – STILL SHOTS
• DYNAMIC
• XRAYS IN MOTION
• FLUOROSCOPY
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STANDARD VS SI UNITS
•R - C/kg
•Rem - Sievert
•Rad - Gray
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measurement
100 R = 1 C/kg1Rad = 1/100 Gray1 Rem = .01 Sievert(Rad + QF = REM)1 REM = 10 mSv
1 Rem = 1000mRem
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Quality Factor
• How dangerous the type of radiation is
• Alpha + fast neutrons = 20
• X-ray, Beta, Gamma . = 1
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REM
• IS A PRODUCT OF THE
• QF x RAD
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Why did the bunny die??
BUNNY A
• Received 200 rads
BUNNY B
• Received 200 rads
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Why did the bunny die??
BUNNY A
200 rads of X-RAY = 200 RADS
BUNNY B
200 rads of alpha =
4000 rads
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Permissible Occupational Dose
• Annual dose:
• 5 Rem / year 50 mSv / year
• Cumulative Dose
• 1rem x age 10mSv X age
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Occupational DoseANNUAL LIMITS
• WHOLE BODY = 5 REMS / 5000mRem
• LENS OF THE EYE = 15 REMS
• EXTREMITIES = 50 REMS
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OCCUPATIONAL EXPOSURES
• 5 REMS / YEAR BUT NOT TO EXCEED 1.25
REM/QUARTER
AVERAGE ACTUAL EXPOUSRE IS APPROXIMATELY 50 mrem/year
• OLD “MPD 5(Age – 18)”
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PUBLIC EXPOSURE
• 10 % OF OCCUPATIONAL
• NON MEDICAL EXPOSURE
• .5 RAD OR 500 MRAD
• UNDER AGE 18 AND STUDENT
• .1 rem 1 mSv• Pg 98 RTA BOOK
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CARDINAL RULESOF RADIATION PROTECTION
•TIME
•DISTANCE
•SHIELDING
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ROOM SHIELDING
• PRIMARY SHIELD – • PRIMARY BEAM DIRECTED
AT WALL• 1/16 LEAD - 7 FEET HIGH
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ROOM SHIELDING
• SECONDARY – NO PRIMARY BEAM
• 1/32 LEAD
• CONTROL BOOTH (SECONDARY)
• BEAM SCATTERS 2X BEFORE HITTING
• LEAD WINDOW – 1.5MM LEAD EQ
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MONITORING
• CONTROLLED AREA – Used by occupationally exposed personnel (monitored)
• 100mrem / WEEK
• UNCONTROLLED AREA – PUBLIC
• 2 mrem per week*
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SHEILDING
TECHNOLOGIST . 25 mm LEAD
• LEAD APRON, GLOVES
• THYROID SHIELD, GLASSES
PATIENT –
GONAD SHEILDING
. 5 mm LEAD
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GONAD SHIELDING
• MUST BE . 5 MM OF LEAD
• MUST BE USED WHEN GONADS WILL LIE WITHING 5 CM OF THE COLLIMATED AREA (RHB)
• KUB. Lumbar Spine Pelvis
• male vs female shielding
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TYPES OF SHEILDING
•FLAT /CONTACT
•SHAPED
•SHADOW
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Personnel Monitoring Devices
•Film Badges•TLD / POSL•Pocket Dosimeter•Ring Badge
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MEASUREMENT
• FILM BADGE
• TLD• POSL• POCKET
DOSIMETER
• ABOVE 10 MREM
• ABOVE 5 MREM
• 1 MREM
• NOT ACCURATE
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REM
• IS A PRODUCT OF THE
• QF x RAD
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Pregnancy & Embryo
Mother –
occupational worker (5 rem)
• Baby – (500 mRem)
• .5 rem/ year .05 rem/month
• 5 mSv .5 mSv / month
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Declared Pregnant Worker• Must declare pregnancy – 2 badges provided• 1 worn at collar (Mother’s exposure)• 1 worn inside apron at waist level
Under 5 rad – negligible risk
Risk increases above 15 rad
Recommend abortion (spontaneous) 25 rad
• (“Baby exposure” approx 1/1000 of ESE)
• www.ntc.gov/NRC/RG/08/08-013.html
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Pregnant patient
• ALWAYS ASK LMP before exposure made
• “10-day Rule” No longer used
• “Grace period” of implantation
• STATE – Beam 5 cm within gonads
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PREGNANT PATIENTS
• ASCERTAIN LMP - IF FETUS IS EXPOSED• PHYSICSTS WILL NEED INFORMATION:• WHICH XRAY MACHINE USED (MR/MAS)• # OF PROJECTIONS (INC REPEATS)• TECHNIQUE FOR EACH EXPOSURE• SID • PATIENT MEASUREMENT AT C/R• FLUORO TIME & TECHNIQUE USED• PHYSICIST WILL CALCULATE FETAL DOSE
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RADIATION DOSE TO PATIENTS
• ESE - ENTRACE SKIN EXPOSURE (MEASURED BY A TLD)
• SKIN DOSE• GONADAL DOSE• BONE MARROW DOSE• (MEAN GLADULAR DOSE- MAMMO)
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AP VS PA EXPOSURE/ESE
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SOMATIC & GENETICSTOCHASTIC VS NON STOCHASTIC
• A = STOCHASTIC• “CHANCE” EFFECTS GENETIC, LEUKEMIA,
CANCERDIAGNOSTIC RADIOLOGY
B= NON-STOCHASTICTHRESHOLD EFFECTSDETERMINISTICSOMATIC EFFECTSSKIN ERYTHEMA,
CATARACTS, STERILITYRAD -MALIGNANCIES
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GSD• GENETICALY SIGNIFICANT DOSE
• Takes all of the population into account
• Annual AVERAGE gonadal dose to population of childbearing age
• 0. 20 mSv or 20 millirem • rem or rad???
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REDUCING REPEATS
• TECHNIQUE CHARTS
• CAREFUL REVIEW OF TECHNICAL FACTORS
• REFER TO TECHNIQUE BOOK AND
• ASK WHEN YOU ARE NOT SURE!
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Carlton Ch 13 - p. 208 & 210 & 214
• “AVE” CHEST EXPOSURE - 2 IMAGES
• (Ave – Pt meas 23cm pa 40cm lat)
• PA 110 KVP 5 MAS 16:1 GRID 400RS 72”
• LAT 110 KVP 20 MAS 16:1 GRID 400 RS 72”
• WHAT IS THE PATIENT’S DOSE??
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PEDIATRIC EXPOSURE
• MORE SENSITIVE TO RADIATION THAN ADULTS
• LIMIT BEAM TIME • MAY REMOVE GRID (REDUCE
EXPOSURE)• AP VS PA• COLLIMATION & SHIELDING !!!!!!!!!!!!!!!• GENDER DIFFERENCES• IMMOBILATION
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