»~bea- The zn§5 peak at 1 12 MEV occurrea in every tissue sample teeted, indicating the com:men occurrence of thie isotope compared with other S This Ta tdiGssulupe tas been voserved in iian tissues by many authcrs, as sun:marized by Lowman et al. (1957). Additional data from this Luboratory are given in Table 4. The Co9? peak of 0. 12 MEV was present in the liver tested, however, it appears to be rather omnivorous fish taken at Rongelap Island. of all low in the liver fish tissue of This radioisotope was not detected in goutfish gut or goatfish bone, but occurred in small amounts in goatfish muscle No distinct peak at 0.12 MEV appeared in the muscle tissue of reef fish or tn halfbeaks taken at Kabelle Island. The peak of Mn°4, at 0. 84 MEV, was partially obacured by the Co58 peak at0 8! MEV Oneor both of these radioisotopes present in the muscle and liver of reef fish from muscle and liver of halfbeaks from Kabelle Island, appeared to Enibuk Island, in be the and possibly were present in the muacle of reef fish from Kabelle Island. Verification of the presence of both of these isotopes in Enibuk reef fish liver was later obtained by 1on-exchange resin column analysia (see below) The Co50 peak at 1 17 MEV was obscured by the Zn89 peak at 1.12 MEV; however, the Co®9 peak at 1.33 MEV was observed in the liver and muscle of Kabelle goatfish and in the liver of Rongelap omnivorous fish The presence of CoS9 was also later verified by analysis of Enibuk reef fish liver. ion-exchange