SQ
EFFECTS OF IONIZING RADIATION
Theresidual total beta activity found in the
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 +5 days the decay curve
is essentially that of Sr, the most abundant
of the longer-lived elements deposited.
two larger fish at 4 months post detonation av-
eraged 2.5 we (Table 5.10). There was, at the
sametime, about twice as much gammaactivity.
The fish were collected 56 days post detonation, and the dropinactivity between that time
Table 5.10.—Beta and GammaActivity of Fish From Rongelap Three Months Post Detonation
FisH #1 (802 GM)
Ba, Sr
AND RARE
EARTH
TOTAL
ACTIVITY
(PERCENT)
Gross ACTIVITY,
ne
BETA
Head___..-.-----...------
Scales+ Fins+ Tail_.______Viseera______ wee eee eee eee
Gills___.__._._-..--____--Remainder of Body______.-Total____________-_-
GAMMA
0. 568
0.
0.
0.
0.
1. 26
500
900
160
596
0.
2.
0.
1.
2, 724
RADIOCHEMICAL ANALYSIS (PERCENT) («N Ba, Sr and
Re
FRACTION
9.9
58
36
43
78
Sréé
38. 3
9.5
48. 0
7.8
8. 3
Total_.__-__________-
52. 1
9.9
0. 6
6.7
11. 2
72.7
98. 0
79. 4
43. 6
6. 41
FisH #3 (168 GM)
GRoss ACTIVITY, uC
BETA
GAMMA
0.
0.
1.
0.
0,
0.
9. 6
17. 4
14
13. 9
45. 2
Fisu #2 (507 Gu)
Head__..______-___----_Scales+ Fins+ Tail________Viseera_____.._---2- ee
Gillg_._._-_-_-._---------- Le
Skeleton_...._-_____-_--_ Lee
Musele__._-..--------_-____-
RARE
EaRTH
Bale
101
067
620
043
197
151
2.179
0.
0.
2.
0.
0.
0.
Gross ACTIVITY, ut
BETA
GaMMA
23
23
14
09
35
53
0. 045
0. 058
0.115
0. 023
0. 030
0. 088
0.
0.
0.
0.
0.
0.
3. 58
0. 301
0. 461
CLAM #1
TotaL BETA ACTIVITY—6.4%18 D/M
RaADIOCHEMICAL ANALYSIS
RADIOELEMENT
Zrs__ ee
Ru, 1060
Other__-_-__-.-.----__-_- ee eee
Bre ee
Bale. oe
Rare Earths_.__.....--2---- 2
Samples collected two months post detonation.
PERCENT
oF TOTAL
ACTIVITY
21. 4
32. 4
11. 4
0.7
0..7
33. 4
017
084
205
011
070
O74