bee C P- t mm t po q q : 4 r bee 4 ijooOr 4 a _ J A! a GAMMA Lt a activity |! n qs : “\ 100F : FC ’ : “ = 1———= PLANKTON STATIONS 50,5!,52,53 2 r i $ L \ 5 \ PLANKTON STATIONS 43,44,45,46 ——— a lok ~ PLANKTON STATION 42 - — Co/Zn = 5.5/1.0 Co P ~ ~ 58 87 +> I2MEV SIMEV nd l 02 04 Fig. 2 “ . A p= Co 2 Co/ Zn0.9/1.0 S765 -~ . Co'/ Zn” =0.19/ 1.0 i] x MEV t_ 06 08 MEV j WW cg” A [MEV Co | [3 MEV a 12 + Co. SPIKE 4 DOE ARCHIVES | 14 Gamma spectrum curves from three areas west of Eniwetok Atoll showing the variation in ratio of Co?/en®5, The gamma peaks of mn>4 C058, and Co©° are also indicated. The gamma peaks of a Co°? spike are shown for comparison. 3