-13II IIt IV 1d V Bonito liver, Fox Island, Bikini Atoll, collected September 22, 1956. Fish liver homogenate, How Island, Bikini Atoll, collected September 22, 1956. Fish liver homogenate, Belle Island, Eniwetok Atoll, collected May-June, 1954. Soil, Belle Isiand, Eniwetok Atoll, collected September 19, 1956, The results for the first two separations -- clam kidney and bonito liver -- are described in detail. The summarized results of these and the other three samples are shown in Table 4, Sample I Tati cogentARsehr's MaREHyae as sueay Clam kidney sample I (Belle Island, Sept. 22, 1956) was passed through a Dowex 50 cationic resin column (Fig. 1). ‘The anions were not adsorbed onto the resin bed and were washed out of the column with a .2.N HCl. This fraction consisted of Ru?6RnLOS and Zr??-Nb?° in the anion form. The disintegration rates of the Rut°6_pyt°© (13,000 afm) and 2r95-Nb95 (2,430 d/m) in the fraction were determined from the 7 spectrum curve (Pig. 2). On the basis of the disintegration rate calculated from the spectrum the c/m. B count for the fraction should have been 2,190 The observed B Zr??-Np??, oxalate sample. count was 2,300 c/n. in the cation form, and Fe? were present in the Based on calculations from the 7 cationic Zr?°-Nb?° accounted for 280 d/m and Fe??, (Fig. 2). 7 spectrum curve, 2,680 d/m Fe?° was detected at a very low efficiency in the frac- tion because an end window geiger tube was used for the measurement. ; nt L me ” o eo 44 \N