-15- observed at station 42 approximately 480 miles west and slightly north of Eniwetok Atoll and did not coincide with the center of greatest total radioactivity which occurred approximately 110 miles due north of Eniwetok Atoll (21). The C057 /zn©5 ratios decreased with increasing distance in all directions from station 42. The ratios of Co-!/Fe5> for the five plankton samples are shown in Figure 4c. Co57/zn®5. The ratios are similar to those of The values are as follows: C057 Coot 7,8,9 0.6 0.5 13,14,15 0.6 0.4 43,44,45,46 0.9 1.2 590,51,52,53 0.2 0.2 57,58,59 0.1 0.1 Station — zn©5 Pe55 DOE ARCHIVES