7 SS Table 1. Allowable counting errors accorgng to the _ . total activity in the sample received by <1e contracz 73 laboratories. Radionuclide pCi 239,240py l-g error “%) <0.1 50 to 1G 0.25 to 1 <20 0.1 to 0.25 >I 238,241py <40 «10 ¥ «2 50 to 166 2 to 5 <A0 5 to 20 <20 <0.1 50 to 100 >20 241 Am 0.1 «10 to 0.25 <40 0.25 to | <20 >I 137¢5 <10 ral 50 to 100 1 to 5 <30 >8 «10 5 to 8 90Sr <20 <] 50 to 100 1 to 5 <30 8 «10 5 to 8 80% of all duplicate pairs mo included <20 in each OCD, Duplicate samples are prepared and distributed by LLNL. 3. The third ‘criterion requires that the laboratories accurately determine the radionuclide concentrations of blind standards. Although all three of the criteria are important, perhaps this is the most significant because it includes accuracy of measurement as well as precision (reproducibility): therefore, any systematic errors in the measurement would appear. Responsibility for preparing, standardizing, and distributing the. standard samples was assigned to Dr. Oavid Jennings of Western Oregon State — College (WOSC). In this way, the primary responsibility for evaluating the analytical integrity of the data was vested in a aisinterested party. 5000315