= e= 
ClomSicanic railed ely, 
6. The ratio of Co57/zn65 at Bikini and Eniwetok Atolls was 
0.06:1.0. Similar ratios occurred 200 miles south and west 
of Eniwetok Atoll. Slightly higher ratios occurred to the 
north. The center of high Co57/zn65 ratio (5.5:1.0) was 
found approximately 480 miles west and slightly north of 
Eniwetok Atoll and did not coincide with the center of high 
total radioactivity in plankton, which was located 110 miles 
north of Eniwetok Atoll. 
7. The changes in ratio of Co>//Fe°5 with change in geo- 
graphical location were similar to those of Co57/zn®5. 
