A single soil sample from Bokdrolul showed approximately 85% 137Cs and 15% °°Co. No edible plants were found on any of these islands. Since the maximum exposure rate found for this group was 50 uR/hr, the exposure rate reductions were not projected. CHARLIE (NAM) As indicated by Figure 14, the external radiation levels on Nam, located in the northwest corner of the atoll, are slightly higher than those on Bikini with one “hot spot" of 500 yR/hr found near the northwest side of the island. A single soil sample taken in a background area of approximately 200 .R/hr showed the concentration of gamma emitting nuclides to be composed of about 50% 137Cs, 33% 6° Co, and 17% 125sp, The exposure rate reduction as a function of time for this composition is given in Figure 15. Radioactive scrap was found at several locations on the island. maximum reading obtained on any piece of scrap was 500 ,R/hr. The All radioactive scrap reading in excess of 100 y,R/hr (gamma) was buried at sea. Less radioactive material was buried on land with the non- radioactive debris. Although this is the third largest island and one which had been previously utilized as a source of food materials by the Bikinians, there are at present no edible land plants or coconut crabs on the island. A sample of fresh water from Nam, taken in 1964 and supplied to SWRHL by the Laboratory for Radiation Ecology, contained 15 pCi of 3H/ml1. Tritium levels in all other water samples from various islands were Tess than 0.4 pCi/ml. A sample from a Portulaca plant (high water content) taken in June 1969 contained 1.5 pCi of 2H/ml] of extracted water. The concentration of 137¢s in the plant material was 210 pCi/g and of ©9Co was 3.8 pCi/g wet weight. 25