SPECIFICATIONS FOR TOTAL BETA ACTIVITY MEASURENENTS Determination of mixed fission products (total teta activity in samples of soil, water, vegetation and bons} = the following requirements are suggested: Ie Analyses to be made on dried aliquots of soluticns prepared fremthe above samples by ashing or other suitable treatment. The weight of sample in the aliquot may: te selected by the analyst to give suitabls activity. #- The originall sample dissolved should be a minimm of 10 grams of ash or other solid, or the complete sample. 3» <A correction should be mde for self-absorption by standard techniques but a self-abserption curve on each sample is not required. lh. The beta activity should be determined by standardization against the K-40 in natural potassium salts, the standard also being corrected for self-absorption. - Choco ot ok san on PRA Re oa a ee ag 5s 9002341 Wo chemical separations are required and any natural activity may be included as part of the tetal beta activity.