-4OThe terns, or sea swallows, at the Pacific Proving Ground also contain gn©> in their organs and tissues. Except during the time interval shortly after detonation, almost a11 of the radioactivity in these animals is due to an©>, 7 curves for tern muscle, lected in 1954 at Bikini, gn°> splke. total ZY lung, liver, kidney, In Fig. 14 the and gut, col- are compared with the curve for a In each case n°? contributes almost all of the activity. In tern liver samples collected in Septem~ ber 1956 at Bikini, however, Co?! C078, and a0°° were also present although almost all of the radicactivity was contributed by zn°> (Pig. 15). In the corresponding 1954 Bikini tern liver sam- ple shown in Fig. 15 all of the Y activity was due to zn©?, A pattern of distribution of the radioactive lsotopes of the transition elements manganese, iron, cobalt and zine in the plants and animals at the Pacific Proving Ground is evident even from the limited number of In general, 7 spectrum curves made thus far, these fsotopes are found in the sea and not on the land, in the marine animals and not in the marine plants. Table 5 shows the samples, on which 7 spectra have been made, in which none of the above named transition elements could be detected. Table 6 shows the samples in which the isotopes in question have been observed by JY spectrometry. On the land few or none of the non-fission products were detected in the soil, in the Plants growing i: the soil, nor in the herbivorous rats. In the water surrounding the islands few or none of the non-fission products were present in the algae nor in the sea