OFFICIAL USE ONLY 1 "Tissues of a few marine specimen were analyzed for Cs 37 (37-year half-life) since this nuclide was present in high concentrations in water and coconut milk from this area. The tissues of the rooster. and 1 of the coconut crab contain significant amounts of Cs at A very high 13 fraction of Cs 3t activity was noted in the muscle of the rooster (40 percent of the total beta). * Further radioanalysis of marine specimen indicated that the rare earth group constituted a few percent of the total beta activity. rud°6_pn 106 and rr9? -Nb?? contributed the largest percentage of the total beta activity.” The AFL reports: " m=The sr” values for food plants, except coconuts, collected in October 1955 approximate the theoretical porpor- tion of mixed fission products activit cent. Coconuts contained 0.1 percent sr? correction for time of collection.--- t 1.7 years, 4 perwith appropriate "---Jn contrast to the strictly marine forms, ths coconut erab, which feeds principally on land plants, had Sr’~ jJevels of 3 percent in the muscle and 12 percent in the hepato-pancreas or liver, where caicium salts are stored.. The radioisotopes in salts seachgg from the carapace were found to consist entirely of Sr? oree "a--Radionuclides of Sr, Cs, Ce and their daughters did not account for the total activity in most (fish) samples analyzed. Complete fission product analyses of samples collected at Eniwetok and Bikini Atolls indicate that non~-fission-product radionuclides may account ger more than half of the total activity in some fish. %m-~ contributes one-fourth or more of the total activity in shark muscle as determined by radiochemical analysis and confirmed by following the decay." (2n©5 is not a fission product.) The two year survey by "NRDL continues to indicate the high * See Section IV OFFICIAL USE ONLY