~5« Sr-90 in any appreciable amount is found only in the land crabs. The level of Sr-90 activity has remained rather constant since May 1954 although there may be considerable individual variation in samples from one place at one time. The radioisotopes present in a July 1957 Kabelle Island soil sample vere as follows: CelS4-prl44, 427; ve55, 41%; Rul06.2n106, 9%; gb125, 3.7%; Eu, 1.4%; sr90-y%, 1.3%; cal37, 412; mn54, 12%; coOS, 12; zr95-mg95, 1%. In land plants most of the gamma activity is due to cs137 but in coconut milk and meat there is a trace of zx95~g95, In the algae most of the activity ia due to cel44.prl44 with & low amount of Buy?06..RH10677-95.47995 and a trace of 2n®5, The only $r90 found in fish tissues have been traces (maximum value 14 s.u.) in the reef fish from the July 1957 collection and one bonito from the 1955 collection. 2085, Co57, Co60and mn54 vere common in all soft tissues. For a fish liver about 40% of the total activity was due to Zn55; 28% to Co%7, Co58, and Co69; 26% to Fe55; and about 6% to unidentified radioisotopes. In the liver of the coconut crab (Birgus) and the kidney of the clam (Tridacna) 2n§5 and Co60 account for a large pert of the total activity. Food samples collected by Dr. Conard have been sent to HASL for analysis and the food samples collected at Rongelap this month (see Page 4) will be analyzed upon arrival at the University of Washington. The reports listed on pages 2 and 4 and the data made reference to on pages 3, 4 and 5 are available if needed. 9002233