—Kg@«6eo-.mTCTCTLTFTTFTeeeNT peeuadure similar to that described by Lowman et a]. (1957}. Tee counts per minute (c/s) for each radioisotope were converted to disintegrations per minute (d/m) b applying the correction factors listed in Table 1. The size of the Sample affects the geometry ,and the correction factors listed @o not include errcr due to the differences itn geometry between the biclogical samples and the raditoisctope standards used to calibrate the efficiency of the counting system. TRis error ranged from 10 per cent for the smellest baclogical samples to 60 per cent for the largest samples. The approp:iate decay-corraction facter was applied also to correct the values to the date of collection. Table 1. Correction factors used to convert gamma counts to ¢:sintegr at tons Radioisotope Correction fay oy x40 609 csi3? 16.5 za65 54 Zn?mp9 ce*7 14.5 3.6 ce44_p,144 wi8s Rub _ 2,106 | oe . : 40 9.6 66.4 eee