, oes sy tt dy “Et ain RieNI aaaaieri at oreia eth i th ee ARRAScseho ee . . : = aa rirail Organism Date of collection Site of collection Pish gut May, June, 1954 Belle Is., Eniwetok Whole mullet May 19, 1954 Edna Is., Eniwetok Plant leaves Sept. 22, 1956 Bikini Is. Plankton June 1956 West of Eniwetok Plankton Sept. 1956 (Scaevola) PO METGi" Faclig 2 BoWh e. Tie wR ec wear de POE I Meet magia ee ieee scaeeea sesseel asHispa ; ; ; 1 ~37- Coconut crab liver tt uw Coconut crab " " tt it 1% Nan Is., Bikini " Tt i" carapace Bonito liver Sept. 22, 1956 Bikini Is. Bonito muscle " " " " " Fish liver homogenate " " " " " Gamma spectra from the first five samples are shown in Fig. 12. Only in the fish liver sample is the zn7 peak low, in which case it is masked by the 1.17 MEV peak of Co The JY peak for n°? is, however, 60 strong in the curves for the other fish tissues (gut, bone, skin, and muscle) indicating a high level of n> in comparison with the other mn54 4s also present in the fish bone, skin, JY emitters. and muscle samples. ‘ ee Eoie apie bt, abIE IE antesites, The latter sample also exhibits a weak peak for Csl37, an isotope often found in the muscles of many species of animals collected at the Pacific Proving Ground. High levels of zn? are also present in fish collected re- cently (Sept. 1956, Fig. 13) as well as in the 1954 fish samples described above. a