OFFICIAL USE ONLY 1 "Tissues of a few marine specimen were analyzed for Cs st (37-year helf-life) since this nuclide was present in high concentrations in water and coconut milk from this area. The tissues of the roosterand 1 of the coconut crab contain significant amounts of Cs oe A very high 1 fraction of Cs 3t activity was noted in the muscle of the rooster (40 Further radioanalysis of marine specimen percent of the total beta). * indicated that the rare earth group constituted a few percent of the total beta activity. put_ey 106 : : | and Zr?°-Nb?” contributed the largest percentage of the total beta activity." The AFL reports: 0 "---The sr’ values for food plants, except coconuts, collected in October 1955 approximate theoretical porportion of mixed fission products activityapt 1.7 years, 4 percent. Coconuts contained 0.1 percent Sr7~ with appropriate correction for time of collection.--- "ee-In contrast to the strictly marine forms, eocorut crab, which feeds principally on land plants, had Sr” levels « of 3 percent in the muscle and 12 percent in the hepato-pancreas or liver, where calcium salts are stored.. The radioisotopes in salts geached from the carapace were found to consist entirely of sr?) = y”,... : "—-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 for more thanhalf of the total activity in some fish. Zn’ contributes one-fourth or more of the total activity in shark muscle as determined by radiochemical analysis and confirmed by following the decay.” (zn®5 is not a fission product.) The two year survey byNRDL continues to indicate the high * See Section IV OFFICIAL USE ONLY 5002119