10,000 -—"" TTT TT TTT TTT TTT T ma ~—@ Duplicates overlap within 2 o Y a / © Duplicates fail to overlap within 2 o oy , a y 1,000 E- y/ LL / y 4 = 4 / a 7 _ \ Lp pyri) 7 Porerriiy 100 7 7 1 10 ¢ = E 4 _ - Uv Aliquot A (pCi/g) T LY 4 Z e = e : 7 10% pea 1.0 ttl 10 tt tt 100 top iityl 1,000 t 10,000 Aliquot B (pCi/g) Figure A&. Acceptable quality control results for duplicate pairs analyzed for 239+240py 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. One unacceptable pair is not shown. 32