1.0 SL rT F @ Duplicates overlap within 2 o 7 |. © Duplicates fail to overlap within 2 o a L ; @ 0.1L P 0.01 a C ° L < y 7 °# = a < 5 4 a £ r SB T rs ost!© 0.001 C a E E - 7 = / / ° ere ow yo — a @ ® 0.0001 -- _ O bee [- 1 7 4 7 e — e =z 4 ° 7 — / — LO 7 _ 7 0.00001 Wt 0.00001 tt ii 0.0001 ceettt 0.001 op pl 0.01 yp pl 0.1 1.0 Aliquot B (pCi/g) Figure All. Acceptable quality contro! results for duplicate pairs analyzed for 241 Am in soil by Environmental Analysis Laboratory. Results depicted are for concentrations between | x 10> and | pCi/g. Broken line represents perfect agreement and is not a fit to the data. Five pairs (four acceptable) involving zero or negative concentrations are not shown. 39