goadioh caught at Kabelle [stand The radioactivity in muscle tissue was reneraliy about the same in Kabelle and Enibuk reef fish. Gamma radioactivity in (he muscle averaged about 26 per cent that of the liver with variation of from 7 io 48 per cent. Beta activity was Slightly lower, the muscle to liver ratio averaging about 1° with a range of from 5 to 27 per cent. er cent, The greatest difference in the arounts of both gamma and beta radioactivity between liver and muscle was found in the zoatfish. Gamma Spectra Gamma spectra were made on dried samples of tissue to determine if gamma peaks other than those from expected fission products were present. The gamma spectrum curves obtained from various fiah tissues are compared with spikes of radioactive cobalt and radioactive zinc in Figure 3 (top, center panel) The gamma spectra (made in October 1957) on whole exhibited certain common characteristics with peaka positions as follows: 0.12 MEV considered to be from Co?? Le 0.51 MEV " mom " 7n85 0.84 MEV " mos " Mns4 1.12 MEV " mos " 7n85 1 33 MEV " moe '" €o60 at samples several