DASA 2019-2 208 DONALDSON: The ucean fish are essentially carnivores, and the lagoon fish are herbivceres, You immediately fractionate on this basis alone, that is, the food chain is different. As you move up the food chain to the carnivores the radioactivity is less. FREMONT-SMITH: DONALDSON: CONARD: So it was the herbivore that was responsible. The herbivores are obviously the best concentrators. Figure 4] is a spectrograph of what you get from the whole-body count, showing the comparisan of the count in 1957 before, and in 1959 after, moving back to Rongelap. In March 1958, shortly after they had come back, they showed an increase, the first peak being cesium-137 and the second peak zinc-65,. We carried out these whole-body counts over the years since they've been back on the island and [ can now review very briefly what's happened in the way of the body burden of these isotopes. Figure 42 is a histogram which shows the changes over the years. The first 1954 data there show the higher levels, of course, connected with the initial contarrination, and then up until 1957? their body burdens 000 T 5 TTT C82. C r r Z Tt NET IN VIVO GAMMA-RAY 3 SPECTRA OF MARSHALLESE”] SUBJECT (NO.79)MALE, J AGE 44 za** , . z 'OOF- marcy 1959 E £ 4 3Z F CHANNEL WIOTH yo Lo r 3 20 hev 4 ~~ os ws r J 3 = ~ na e gs 3° 8 be 10 L— > . MARCH 1957 CHANNEL WIOTH 4 4 50 hev 4 4 be 4 fF 34 +f x Lo 4 Lt 20.40 i 4 660 BO Mev to 10 2 1.20 140 16 Figure 41. Typical gommo spectrograph of Marshallese subject before (March 1957) and after (March 1959) moving back to Rongelap Island. From R. Conard. °