noted; wi81. 165 Contributed the ™@&)Or portion of the radio-~- activity in gogevola leaves from Kusaie and in Messerschmidia and scaevola leaves from Ujelang (Lowman et aj. 1959), and 2n°> was predominant in fish tissues Co?’ was present ugual:y in from Ponape anu Utirik. jeseer amounts, and co38 and Co°? were found enly in a sample cf clam kidney from Ujelang and a fish liver sample from CUtirix. other radioisotopes were present only in a few samples. cst3°, an plants a from Kapinodamarargi an. few samples from Kusa:2, fish sir. and gut for exampl», was found Utirik, Cel4i, 144_5,144 Pr nupe and Uj:lang, and mn? t |, - in from Ponape and clam kidney from U;elang. Pp: 34 wos detected once only. in ¢ caaple of sk -p:ack muscle f: 4m Ponape. The quantitative results of the gamma spectrum analyses shown 1n Table 3 are Lased or. analyses made approximeteiy eighteen months after the samples werc collected; the shorter-lived radioisotopes 7599 =Kp?9 consequently (nalf€ life 65 days), co93 (71 days) Rut93-pnt43 (40 days) and cet4! (32 days) had decayed to insignificant or non-detectadle cram sample cf yellow-fin tuna from Ponape, were found in low amounts levels. however, Ina 161l- Zr ?>-Nb99 (0.12 puc/g at tame of counting): at time of collection the level of 7r95=Nb95 would have been 40 wyce/g. K40 was present im all samples analyzed. -|s- In some