4-2-14 radon presentation - comments on measuring long-term average radon … · 2014-04-01 ·...
TRANSCRIPT
Com
men
ts o
n M
easu
ring g
Long
-Ter
m A
vera
ge
Rd
Ll
Rad
on L
evel
sP
rese
nted
To:
Pre
sent
ed T
o:
NR
C W
orks
hop
on E
valu
atio
n of
Rad
on a
nd
Rad
on P
roge
ny in
Air
and
Com
plia
nce
with
10
CFR
20.1
301
and
(2)
Pre
sent
edB
y:P
rese
nted
By:
Dou
glas
B. C
ham
bers
, Ph.
D.
Apr
il 2,
201
4
1
Obj
ectiv
eO
bjec
tive
N
ota
deta
iled
criti
que
ofin
terim
Gui
danc
e,
Not
a d
etai
led
criti
que
of in
terim
Gui
danc
e,
rath
er a sh
ort c
omm
enta
r y o
n na
tura
l lev
els
of
yam
bien
t rad
on, a
nd s
elec
ted
com
men
ts o
n ch
alle
nges
of m
easu
ring
smal
l inc
rem
enta
l (a
bove
bac
kgro
und)
leve
ls o
f Rn-
222
2
Out
door
Rad
onO
utdo
or R
adon
R
adon
rele
ased
from
Ra-
226
in s
oils
is th
e si
ngle
larg
est
sour
ceof
Rn-
222
inth
eat
mos
pher
eso
urce
of
Rn
222
in th
e at
mos
pher
e
Rad
on le
vels
in o
utdo
or a
ir ar
e af
fect
ed b
y th
e re
gion
al
geol
ogy,
met
eoro
logy
, loc
al to
pogr
aphy
…S
dif
di
iN
di
didi
d
Stud
ies
of o
utdo
or a
ir in
Nev
ada
indi
cate
a m
edia
n ou
tdoo
r co
ncen
trat
ion
of 0
.4 p
Ci/L
with
con
cent
ratio
ns o
f up
to 1
.4
pCi/L
at m
easu
red
loca
tions
(Pric
e 19
94)
R
adon
leve
ls c
hang
e di
urna
lly a
nd b
y se
ason
ra
don
conc
entra
tions
typi
cally
reac
h th
eir m
axim
um in
the
sum
mer
to
ear
l y w
inte
r, w
here
as fr
om la
te w
inte
r to
sprin
g, c
once
ntra
tions
y
,p
g,ar
e us
ually
at a
min
imum
as
a re
sult
of m
eteo
rolo
gica
l cha
nges
an
d so
il m
oist
ure
cond
ition
s (N
AS
199
9).
3
Rn-
222
Con
cent
ratio
nD
iurn
al V
aria
tion
SO
UR
CE
: Afte
r Pea
rson
, U.S
. Dep
artm
ent o
f Hea
lth &
Wel
fare
, 196
7,
p,
Rad
on C
once
ntra
tion
in S
oil
Gas
of S
edim
enta
ry R
ocks
y ac
cord
ing
to g
eolo
gica
l ag
e
ac
cord
ing
to ro
ck ty
pe
Jung
et a
l
Out
door
Rad
onco
nt’d
Out
door
Rad
on co
ntd
A
ccor
ding
to N
AS
1999
, mea
sure
men
ts ta
ken
over
the
g,
cont
inen
tal U
S, A
lask
a an
d H
awai
i sho
w th
e hi
ghes
t co
ncen
trat
ions
are
foun
d in
the
Col
orad
o Pl
atea
u w
here
mea
sure
men
tsra
nged
from
05
to0
75pC
i/Lof
whe
re m
easu
rem
ents
rang
ed fr
om 0
.5 to
0.7
5 pC
i/L o
f ai
r (18
.5–3
0 B
q/m
3 )
The
NA
S 19
99 a
lso
repo
rt m
any
area
s w
ith o
utdo
or
rado
n le
vels
rang
ing
from
0.1
2 to
0.3
pC
i/L
6
Type
sof
Rad
onM
onito
ring
(1)
Type
s of
Rad
on M
onito
ring
(1)
Sh
ort T
erm
2
days
up
to 3
mon
ths
U
se re
sults
with
cau
tion
R
adon
con
cent
ratio
ns v
ary
over
long
tim
e pe
riods
. Lo
ng-te
rm d
ata
mos
t rel
evan
t.
Dev
ices
forS
hort
Term
Mon
itorin
gin
clud
e
Dev
ices
for S
hort
Term
Mon
itorin
g in
clud
e–
Act
ivat
ed C
harc
oal A
dsor
ptio
n-E
lect
ret I
on C
ham
ber
–C
harc
oal L
iqui
d S
cint
illat
ion
-C
ontin
uous
Rad
on M
onito
ring
–C
ontin
uous
Wor
king
Lev
el M
onito
r -A
lpha
Tra
ck
7
Type
sof
Rad
onM
onito
ring
(2)
Type
s of
Rad
on M
onito
ring
(2)
Lo
ng T
erm
Mon
itorin
g
3 to
12
mon
ths
in d
urat
ion
R
ecom
men
ded
Dev
ices
for L
ong
Term
Mon
itorin
gA
lh
tk
dt
t–
Alp
ha tr
ack
dete
ctor
–E
lect
ret I
on C
ham
ber
–D
igita
l Det
ecto
r
Lo
ng te
rm m
easu
rem
ent p
rovi
des
bette
r ind
icat
ion
of
annu
al a
vera
ge ra
don
conc
entra
tion
than
sho
rt te
rm
mea
sure
men
t(di
urna
land
seas
onal
effe
cts
alre
ady
mea
sure
men
t (di
urna
l and
sea
sona
l effe
cts
alre
ady
acco
unte
d fo
r)
8
Rec
ent E
xper
ienc
e fr
om In
door
R
dM
ii
iP
HR
adon
Mon
itorin
g in
Por
t Hop
e
SEN
ES re
tain
ed to
com
plet
ep
indo
or ra
don
mon
itorin
g fo
r ap
prox
imat
ely
1350
pro
pert
ies
Cli
tdid
dth
tit
C
lient
dec
ided
that
mon
itors
w
ould
be
alph
a-tr
ack
rado
n m
onito
rssu
pplie
dby
RSS
I(C
R-3
9)m
onito
rs s
uppl
ied
by R
SSI (
CR
39)
Lo
ng-te
rm m
easu
rem
ents
(5-6
mon
ths)
A
n ex
ampl
e to
illu
stra
te c
halle
nges
in m
easu
ring
rado
n tl
tti
at lo
w c
once
ntra
tions
9
Qua
lity
Ass
uran
ce/Q
ualit
y C
ontr
ol
(PtH
)(P
ort H
ope)
D
uplic
ates
(ata
bout
10%
oflo
catio
ns)
D
uplic
ates
(at a
bout
10
% o
f loc
atio
ns)
A
dditi
onal
rado
n m
onito
rs w
ere
depl
oyed
for
QA
/QC
B
lind
spik
e sa
mpl
es
–30
blin
d sp
ikes
sen
t to
Bow
ser-M
orne
r
Tr
avel
bla
nks
–Tr
avel
bla
nk m
onito
r sen
t with
eac
h sh
ipm
ent
B
lank
s
Bla
nks
–U
nexp
osed
rado
n m
onito
rs, s
ent i
n se
aled
bag
s th
at w
ere
neve
r ope
ned
10
Rad
on E
xpos
ure
in
“Nd”
Bl
k“N
ever
-ope
ned”
Bla
nks
180
120
140
160
Ci-d/L)
Est
imat
ed re
porti
ng li
mit
fb
t0
10
2C
i/L
6080100
on Exposure (pC
of a
bout
0.1
–0.
2 pC
i/L
0204060
Rado
00
1020
3040
50
Sam
ple
Num
ber
11
One
Oth
er C
onsi
dera
tion
-D
ose
is fr
om th
e in
grow
th o
f Rad
on P
roge
ny
1
07
0.8
0.91
ctor
0.4
0.5
0.6
0.7
uilibrium Fac
0.1
0.2
0.3
Equ
00
1020
3040
5060
70
Tim
e (m
inut
es)
Equi
libriu
m F
acto
r (F)
Fi
fDi
as F
unct
ion
of D
ista
nce
NR
CIn
terim
Staf
fGui
danc
eN
RC
Inte
rim S
taff
Gui
danc
e
In
tend
ed fo
r NR
C s
taff
whe
n re
view
ing
uran
ium
g
reco
very
lice
nsee
sur
veys
for r
adon
Su
gges
ts c
an d
emon
stra
te c
ompl
ianc
e by
t
ll
tim
easu
rem
ent o
r cal
cula
tion
0.
1 pC
i/L w
ith d
augh
ters
10
pCi/L
with
outd
augh
ters
10 p
Ci/L
with
out d
augh
ters
“n
et”,
i.e.
, abo
ve b
ackg
roun
d
Cha
lleng
ing
(per
haps
not
pos
sibl
e) to
mea
sure
ann
ual
incr
emen
ts o
f ord
er o
f 0.1
pC
i/L g
iven
nat
ural
var
iatio
n an
d m
easu
rem
ent l
imita
tions
14
Mai
nO
bser
vatio
nsM
ain
Obs
erva
tions
B
ackg
roun
d le
vels
of a
mbi
ent R
n-22
2 ar
e qu
ite
gq
varia
ble
Va
riatio
n in
bac
kgro
und
leve
ls o
f Rn-
222>
0.1
pC
i/L
The
dete
ctio
n le
vel
of tr
ack
etch
det
ecto
rs >
0.1
pC
i/L
Cha
lleng
ing,
per
haps
not
pos
sibl
e, to
mea
sure
suc
h sm
alli
ncre
men
tsw
ithan
ypr
ecis
ion
smal
l inc
rem
ents
with
any
pre
cisi
on
A b
right
-line
app
roac
h do
omed
to fa
ilure
C
onsi
der c
ombi
natio
n of
mod
ellin
g (M
ILD
OS)
with
g
()
“app
ropr
iate
” co
nfirm
atio
n by
mea
sure
men
t (a
ckno
wle
dgin
g lim
itatio
ns a
nd u
se o
f sta
tistic
al te
st)
15