a Oem ae . ae aay Hen from 127Cs for Bikini Island was found typical of other nonblast areas of the atoll. In blast areas, however, °°Co was the dominant contributor to the exposure rate levels with | .225Sb also quite prominant. ver ae The relatively minor contribution of *37Cs compared to ®°Co and +*5Sb in blast areas is quite significant and may be related to the types of weapons tests. ~ ae conducted nearby. Many or these tests were conducted on ......-- - barges and the resulting activation of 5®°Co and ®°Ni in the..- steel of the barges account for the large amount of ®°Co activity. The maximum exposure rates measured on Bikini Atoll in 1967, somewhat over 300 pr/hr, were in blast areas very near the ground zeros of tests. At one isolated area on West i. Eneman near the crouncd zero for two surface tests we -- measured an exposure rate just over 500 ur/hr. Since vegetation in that area was generally sparse and the organic - ” ~ some significance in reducing the radiation levels in these y the ~ a oN ee “ a“ ok % . £ . i Also the greater proportional contribution of the shorter- . . . i kes areas more rapidly. than in the more densely vegetated areas. “ _ &. content of the soils was quite low, weathering may be of ~ ; + a & 5005141 a , . Sr eee Oe Ee Sp, fof cra i. —_ mes % t i =} “