TWELVE MULTIPLE ADDRESSEES H. TO THE CONBINED IN HC1 ADD 30ML OF iIIHOH. ADD NH40H LIROPhJISETO PH 9, ALLO!I/PPT TO FORi~ CENTRIFUGE, DISCARD SIJPERNATE. ADD 2-4 HL 11!HC1 TO CENTRIFUGE IUBE AGITATE UNTIL PPT DISSOLVES. REPEAT THREE PWRE TIRES. I. AFTER LAST PPT DISSOLVE PPT IN IN HC1. ADD 30ML OF DI HOH AiiD WARN IN WATER BATH @ 80 DEGREES C FOR 15 MINUTES. J. ADD 3-4 ML OF SATURATED (NH4)2C204 AND DIGEST FOR TEN MIi~UTES. K. FILTER SAMPLE \,/ITHMILL~poRE GLASS ;4E!IBRA!1E FILTER. App,4RATus THRoUGH TARED CAREFULLY REF40VE FILTERED sw:lpLE AND DRY FOR 30 MINUTES AT 1000DEGREES C. ALLO!4 TO COOL IN A DESICCATOR. L. WEIGH SAMPLE AND RECORD WEIGHT. PI. COUNT SAMPLE IN LOW BETA BACKGROUND COUNTER. CALCULATION: COUIITS MINUTES EFFICIENCY -BACKGROUND CPN (X) INGRO’ATH (1.O)(X) Y-90 DECAY (X)Y RECOVERY(X) VOLUME (2.22) = PCI/UNIT VOLUME