-31-
large plankton and Mo
99 99m
were higher in small plankton; other-
wise the radioisotopic compositions were similar.
Analysis of sea water collected shortly after another underwater
detonation (Umbrella), inthe lagoon at Eniwetok, showed that Np?
Tel32_1132
Ggl43_p,143 ,
39
,
and Mo®9-'7c99™ were the predominant
radioisotopes in the particulate matter (>0.45u) present in the surface
water near target zero (Table 8}.
Table 8.
Percentage of gamma emitting radioisotopes in the
particulate (> 0.454) and soluble (<0. 454) form in
sea water collected 75 minutes after the Umbrella
event (8)
Radioisotope
Np229
Particulate
106 d/m/1
Per cent of
particulate
activity
Per cent of
soluble
Soluble
106 d/m/1 activity
5.2
62.5
30.0
75.6
0.02
0.2
4.0
10.1
Tel32_1132
1.9
22.3
1.9
4.7
Mo29--T.99™
0.48
5.8
3.1
7.8
Cel4l_p,14l
0.028
0.3
Cel43_py}43
0. 66
7.9.
Cel44_py!44
0. 0028
Ba!40_1,,140
0.076
237
Some of these isotopes also
the <0.45yu fraction (Table 8),
0
:
£0.1
0.9
were present
0
0
0.7
in high
1.8
amounts in
which could include materials
VJ ES,
Oe
no