TABLE B-20-1: RANGES OF STANDARD DEVIATION ESTIMATES Ranges Source of Values Location Propagated error on TRU, pCi/g Janet 0.6 - 51.6 Propagated error on TRU, percent Janet 27 - 398 Counting error-IMP 241m, pCi/g Janet 0.1 - 4.6 Standard deviation of TRU/Am ratio* Northern Islands 0.12 - 2.72 Computed brush correction factor Pearl 105 - 1.42 IMP 2414m-reproducibility study, Pearl 7.6 - 9.0 Standard deviation of detector Lojwa 0.07 - 0.58 Standard deviations of kriging error, pCi/g Northern Islands 0.6 - Counting error-lab gamma data, pCi/g Janet 0.17 - 1.66 Counting error-lab alpha Spectroscopy data, pCi/g Janet 0.19 - 6.39 pCi/g effective area measurements, em2 *Due to a programming error the standard deviations reported here are overestimated. B-20-18 16.2