1000 
GAMMA 
ACTIVITY 
100 
——PLANKTON STATIONS 50,51,52,53 
Co’ / Zn = 0.19/ 1.0 
10 J] PLANKTON STATION 42 
57 _ 65 
Co/Zn = 5.5/1.0 
60 
Co SPIKE 
OZ) O04 O68 10:8 LOC rl4. 
MEV 
Fig. 2 Gamma spectrum curves from three areas west of 
Eniwetok Atoll showing the variation in ratio 
of Co>T /2n®, The gamma peaks of Mn 54 C098, 
and Co°9 are also indicated. The gamma peaks 
of a Co? spike are shown for comparison. 
