3. Ganma count17? >» Standardizing against « 25 foid dilution of the originsi spiking solution, prepared in the same way. Calculate the etrontium recovery. Gravimetric Yield 1. Transfer the remaining solution from step 2 under Strontium-85 Yield into a 150 mi beaker and heat to a gentile boil. 2. With continuous stirring, add approximately 5 ml of a saturated NaaCOz solution. 36 Gently heat for 10 minutes. Cool and fiiter through a weighed 5.5 cm glass fiber filter paper. (When using the Buchner funnel to filter, care must be taken to prevent the precipitate from creeping under the filter paper. This can be done by filtering only through the center portion of the paper. ) | 4, Wash paper and precipitate thoroughly with distilled water. 5. Dry and weight to the nesrest milligren. 6. A 10 ml aliquot of the original strontium carrier solution (20 mg per ml) is standardized as the carbon2te by preparing it in the seme way as described above. ~. Caiculate ths strontium recovery. Correct for total yleid by dividing the above recovery factor by 0.96. (This is to correct for the 2 ml eliquot taken for strontium-85 yield. ) (17) This is carried out using a Beird Atcmle Model 810 A bench type scintillation detector well counter -ritn 2 “oraleco decade scaler. - 31 - & cas me NAS . Sa, ~ = =e “ws . a oes Se p SA = aR A 7 eT wy OS Ta RS ay . ~ Fe Ss - a. 7 | : SN wee eR eS ~ S, i