Teta helak Le we tet ibidknack blieB eee Be -21- 10° TTT Tt em Co c 12 MEV q : 4 : | RE 3.3 e-h =~ im * : -p- OF - 4a C = co 58 cf cc = MEV . i fi a ry) MEV : = | : | e ~ to” - boo =i GAMMA ACTIVITY x-NITROSO- “ ~NAPHTHOL—» COBALT SEPARA- 2 10 & TION ON I RE 3.3 - . 2] ws ; "| bm aw iotltp | tf pt 41.2 4 & 8 MEV Fig. 4 tty f tt 1.0 t2 1@ . Gamma spectrum curves of the pH 3.3 e-h ammo- nium citrate fraction from clam kidney sample I eluted on Dowex 50 and of an @-nitroso-A naphthol cobalt separation done on the PH 3.3 ¢-h fraction.