Example
The highest measured concentration of fallout activity in air in a popu-
lated offsite area was at Saint George, Utah on May 19, 1953.
event, sample calculations are made below.
Midpoint of
Sampling Period
Air Concentrations
Duration of
(Hours after
Sampling
detonation)
4.0
Using this
Infinit
Lung
Dose
“Gnen)
4.5
5
us
0.62
12.0
h
19
0.3
16.0
4
18 .
0.01L
2h.0
12
2.6
2.3
8.5
3
5
~ 230
a.
Based on 10 M3/8 hours
b.
Based on 10 M3/16 hours
Doo = (1.28) (h.5) (4.0) (5) = 115 mrem
at
Evaluation of Lung Dcse
i
The sb9.e@ estimate
are based on infinity doses.
The actual dose will be
less then this but the e:cact value is difficult to estimate.
It is probable
that sem= 02 of the mazerial (and activity) will be cleared from the lungs with
a half-time cf about one lay.
1
ahont SOT
it¢
3 aeen
cars.
The remainder may have a half-time of removal of
Tha Awad
n
.
s
-T
Fallout LES
that oceums
one hour after
a detonation
will
exmend
ue
enon?
.
a4
ln
Syl
“Bhs f4ye kh clase
i ee ee
about oat
225 Ls
cf
the
potentisl
intinite
dsse
@eooing
the first day. wile
faileut
that cccurr Lo hours after detiration requires about 15 days to deliver one:
7
halfrc) of 7
the 2infinity
cose.
bat
t4-—.
The uncerte
inties
+
.
ans
,
Ine ny
ane!
in these
and
other
eStimates
anc
shows
7
assuiotions so not justify attemuting an exact calculation of actual radiation
<
4
lung dose.
However, it seems reasonable to assume the actual dose is less
than the infinity dose and mcre than one-half of the maximum value.
* Langham, Wright H. "Determination of Internally Deposited Radioactive
Isoteves From Excretion Anclvses."
American Industrial Hyciene Association
Quarterly, 17:3, 302-315, Septeuber Iyso.
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