the greatest likelihood of the presence of plutonium. The values given in Table 14, therefore, probably are maximum values for each type of sample. The ratios of 239,240 Pu 238 to Pu. approach 2:1 at Eniman I. and are about 15:1 in Bravo Crater. Bikini I. soils contained no detectable 2385 although they . . . 239,240 contained the highest concentration of Pu of the samples analyzed. The presence of 239,240, and 20755 in goatfish viscera is consistent and probably results : . ._. from direct ingestion of fine . particles of sediment during feeding. The absence of 238 ~— . Pu in goatfish viscera as compared with the sediment merely reflects a low concentration of this radionuclide, below the limits of detection. Although none of the 1969 samples were analyzed for the X-ray emitter 6345, this radionuclide was found in concentrations of 80 d/m/g dry weight in Bravo Crater sediment collected in 1967 (Beasley and Held, 1969). Nickel-63 is of particular interest as a tracer since it has a half-life of 92 years. . the clam kidney accumulates 63__, Ni, ' as it does 60 r organism for the presence of fore an indicato Another long-lived radionuclide, 108m Ag, Co, In addition, : and is there- cegy fier stor meiantn’sof OfEn tnrt 63 Ni. Depa ARCHIVES with a half-life of approximately 100 years, has been identified for the first time among the radionuclides at Bikini. This radionuclide was detected from the gamma-ray spectrum of the hepatopancreas of 9001392