~19The 1.17 and 1.33 MEV peaks are identical with those of 650° and the fraction was tentatively identified as containing Co98, 151, .81 MEV; several cobalt isotopes (Co?’, .12 MEV; 60°; and an unknown with a Y peak of 1.0 MEV). The emis- B sion from the fraction had a maximum energy of .35 MEV and approx PB 4mates the maximum B energies of Coo! » 58, 60 (co? .26 MEV + 1008; Co>8 .48 MEV B * 15%; Co .3: MEV P ~ 100%). 60%, which might be confused with C028 with regard to half life and its .84 7 56 emission, was not present. its higher energy 7Y The 1.5 MEV BP + (100%) of Co? ana peaks were not detected. Further tests were run on the so-called cobalt fraction to determine if the 7 peaks identified as Co?! , 6058 , and 9°? could be separated by chemical or further resin column treatment. The cobalt fraction was divided into two samples -- pH 3.3 c-h | and pH 3.3 1-p -- so that both the leading edge and the trailing edge of the peak could be examined independently. Confirmatory chemical separations for cobalt were made on the pH 3.3 c-h fraction by two different techniques in which duplicate samples were used for each method. 5,330 c/n PB A total count of (counted in the methane gas-flow chamber) was pres- ent in each sample, (1) Separation of cobalt by the a@-nitroso- B-naphthol precipitate technique (Hillebrand and Lundell, 1953). original 5,330 c/m B c/m B From an in the samples, totals of 1,390 and 1,510 were counted in the cobalt separations. Gamma spectrum curves made from the separations were essentially the same as those of the original sample except the peaks were steeper and 2 rn vid