‘80
EFFECTS OF IONIZING RADIATION
of the 24 day value. These data indicate that
most of the activity is associated with shortlived isotopes. The initial drop in activity is
very rapid, and after 45 days the decay curve
is essentially that of Sr®, the most abundant
of the longer-lived elements deposited.
Theresidual total beta activity found in the
two larger fish at 4 months post detonation averaged 2.5 pc (Table 5.10). There was, at the
same time, about twice as much gammaactivity.
The tish were collected 56 days post detonation, and the drop in activity between that time
Table 5.10.—Beta and Gamma Activity of Fish From Rongelap Three Months Post Detonation
Fis #1 (802 Gm)
|
|
i
|
Groas Actrviry,
ac
Ba, Sr
| RaDIOCHEMICAL ANALYSIS (PERAND RARE
CENT} iN Ba, Se and
Re
ora
FRACTION
!
Bata
GQaMMa
(Pancest) |
Head._...--2.-.--2--.---- |
Scales + Fins + Tail... ..-_-- ‘
0. 568
0. 500
1. 26
0. 58
9.9
95
Gills. -- 2.2.2.2 222222 eee
Remainder of Body._...-_..
0. 160
0. 596
0. 43
1. 78
Total. ._...--....-2--
2. 724
6. 41
~
Sree
Eagtu
|
Viscera....-.-.--.---- ee | 0900
236
|
=
420 /
7.8
8.3
38. 3
«(174
|
0. 101
0. 23
1. 620
214
Scales + Fins+ Tail. ...__._- |
0. 067
Gilla. 22.22 -- ele
0. 043
0. 09
2.179
3. 58
Viscera_.......-.--2. 22-22. |
Skeleton._.....--.--------.
Muscle._......-..---.-----
0. 197
0. 151
Total. ..--22-- 2-228. |
|
_
|
|
Tota, Beta ACTrVITY—6.4X 108 p/m
RADIOCHEMICAL ANALYSIS
PERCENT
ov TOTAL
ACTIVITY
Zr, eee
24
Other. ....-2.2.2-2.--2---------
114
Samples collected two months post detonation.
0. 045
0. 058
79. 4
43. 6
980
324
0.7
0.7
33. 4
0, 017
0. 084
0. 205
0. 023
0. O11
0. 301
0. 461
0. 030
0. 038
CLam #1
Sree.
Bal@__ 2 eee
Rare Earths....--._.-.--------
6.7
11.2
08
0.115
0. 35
0. 53
Rui ee.
52. 1
72.7
Gross ACTIVITY, uc
Beta
GaMMa
0. 23
RaDIOELEMENT
9.6
9.9
Fisk #3 (168 Gu)
GRoss ACTIVITY, uc
Bata
CAMMA
Head. __-.--..----..-----
14
13. 9
45, 2
Fisu #2 (SOT GM)
-
Rare
Bassé
0. 070
0. O74