| 120 + NUMBER IN CLASS 2-00-48 100 + 80 + 4 60 + 40 + 20 + 0 + 0.25 — t t + t +— 1.25 2.25 3.25 CLASS CENTERS, STANDARD DEVIATIONSIN pCi/g FIGURE B-20-3 ERRORS ON Am-241 VALUE FROM JANET IMP DATA we poe wa + 4.25

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