-16- samples from Wotho, Tarawa, Ponape, and Kapingamarangi, «49 contributed the major portion of the radioactivity. gamples collected at the same time Other contained wi8l, 185, radioisotopes identified with the 1958 fallout. Some samples, Such as coconut crab abdomen and whole fish from Wotho, tained zn°>, whereas others, none. such as land plants, Some of the land plants contained contained measurable amounts of the long-lived fission products cst37 ana gr?°, est level of Sr pace from Wotho isotope by the con- The high- 90 was found in a sample of coconut crab cara(18 pyc/g dry). The concentration of this carapace of land crabs at Eniwetok has been reported by Held (1957). The relatively rapid decay of beta radioactivity in some of the samples collected in 1956 at Tarawa, Wotho (Fig. 2 A-E) isotopes. Ponape and indicates the presence of short-lived A gamma spectrum analysis of one of the samples (leaves and stems of a Messerschmidia plant from Wotho) showed that Zr 95 p95 were the predominant radioisotopes in this sample. Thomas et al. DOE ARCHIVES (1958) found that these isotopes contributed approximately 84 per cent of the total radioactivity in a duplicate sample. The presence of short-lived isotopes in the 1956 samples indicated recent fallout at these islands. ‘7?