- 37 - 10 Tompkins, E. R., J. X. Khym, and W. E. Cohn. Ionexchange as a separation method. I. The separation of fission~produced radioisotopes, including individual rare earths, by complexing elution from Amberlite resin. Jour. Amer. Chem. Soc. 69: 2769-2777 (1947). ll. Weiss, H. V., and W. Shipman. Biological concentration by killer clams of cobalt-60 from radioactive fallout. Seience 125: 695 12. H. (1957). Yamada, K, et al. Studies on the radioactivity in certain pelagic fishes III. Separation and confirmation of 65 Zn in the muscle tissue of skipjack. Bull. Jap. Sei. Fish. 20: 921-926 (1955). (In Japanese with English summary) . Also in Research in the Effects and Influences of the Nuclear Bomb Test Explosions Vol. II: 855-860. Japan Society for Promotion of Science, Tokyo (1956).