10,000 a IT TTT} ~~ @ Duplicates overlap within 2 o |- - / © Duplicates fail to overlap within 2 o / = O 1,000 [- x C a i= a = oO y7 100 — - 3 — cS r / 3\ TOT a 7 1.0 —1 y7 4 ~ 5 4 4 7 4 l Liat 4% TTT 10 | 74 10 -7we 4 Lt oO 7 yo a \ fo / 7 YF 4 / $, = 4 7 7 7 7 tis 10 os pil 100 tl 1,000 - po 10,000 Aliquot B (pCi/g) Figure Al0. Acceptable quality control results for duplicate pairs analyzed for 241am in soil by Environmental Analysis Laboratory. Results depicted are for concentrations between | and 10,000 pCi/g. Broken line represents perfect agreement and is not a fit to the data. 38