168
THE SHORTER-TERM BIOLOGICAL HAZARDS OF A FALLOUT FIELD
withits 22-hour half-life in some of the samples.
This suggests that an appreciable amount of
a
tion rather than proceeding through the food
cycle.
Wl
In looking for strontium-90 in these samples,
we found a maximum value for any one sample
of 2.3 disintegrations per minute. However,
the everage value of strontivm-90 in the speci-
'
i
mens collected prior to the test period was 0.09
i
disintegrations per minute per 24-hour urine
specimen.
an
£
234
i160
a
3 120
x=
%; 100
& so
a
% 60
4
= 40
a
il
265
iso
> 140
activity measurably increased during the inter-
bie
2
Ze
S 20
z 0
wk #
—
10,000} _,
wi
|
t 1
it
SHOT#
3
4
6,7 8
(
8
Oo
o
T
T
*>40,000L.
=
Ge tso00lL. x
bz
a= 30000]
60
40
20
0
z
=
5
a°
wee
|
2
38
SHOT# |
2
3
4
4
5
§&§
6
67
89
z
F
IO)
8
9
t2
0
iH
13
13
14
14
12
Qo
22
FEB.
x
5
1
1S
1.
220
«29
|
FEB.
MAR.
APR,
Fraure 3.—-Camp Mercury, Nevada.
MAY
Ht
5
2
APR.
MAR.
Fraurs 4.—- Tinker Air Force Base.
val between Operations Teapot and Redwing.
This increase is in part due to foreign weapon
tests. In the United States, the average level
of iodine-131 excretion during Operation Red-
|
169
=
3
AV. DPM L'5! PER 24 HOUR URINE SPECIMEN
1
F
4
o
fo]
f
the samples, Theiodine activity here was corrected to shot time rather than to collection
time as is the case for the other graphs.
The strontium data could only be obtained by
pooling mauy individual specimens.
The
yttrium-90 daughter separation and counting
procedures used were identical with those of the
Chicago Sunshine Laboratory.
in conclusion we can report that strontium-90
iodme-131 with the strontium-90 activity in
the radioiodine enters the body through inhala-
pot,
=
aa
o
i
EXCRETION OF RADIOACTIVE FISSION FRAGMENTS BY MAN
Figure 7 shows an attempt to correlate the
off
Lh]
26
3
19
MAY
7
24
wing is not. markedly different from the level
observed during Teapot. Specific data from
the Redwing period will be available in a forthcoming report.