ot ate Ay The results of the analysis of the radionuclides in samples from station 42 differ from those at stations 5 and 55 in that the levels of Celt4_pplt4 and C057,58,60 are respectively 2.5 and 10 times higher at 42; Sr 89,90 is absent at 5 and 55, but present at 42 at a level of about 20 percent that expected 10 from the Hunter and Ballou curves. Qn the bests of the gamma spectrum curves, however, tion of Ce LA4y -F rts the apparent radiochemical determina- in sample 42 is too high. In plankton from all three stations the trivalent rare earths are present at about 30 percent and Rut?3 | Rut6_ppy tO at about 50 percent of the expected levels. nand, ar?>, on the other is present at a level about twice that expected. The total recovered activity in the chemical separations is greater than that usually found. This may be due to error in counting the original sample introduced by the presence of appreciable amounts of Co! , Co’, °° and zn°> » @ll of which emit relatively low energy beta particles in comparison to those from mixed fission products. The gamma spectra of plankton from Marsh stations 5, 54 and 55 indicate a low percentage of cobalt isotopes, but a high level of an? (approximately 50 percent of the total gamma emis- sion) along with colt t py ltt ar? -Nb?” and Ry206_pyp,106 (Fig. 11) At station 54, gamma spectra were obtained for sea water after filtration through a Millipore filter, a flying fish liver (Pig. 11}. fish liver are similar. in the water, however, for plankton, and The curves for the plankton and All of the detectable gamma activity was contributed by 2r?°-Nb?>.