Table B-2-3. Post-Cleanup TRU/Am Ratios on Irene Location TRU/Am 13-N-2 12-N-2 9-5-3 12-N-1 14-N-1 8.48 6.57 7.70 7.34 9.36 10-N-1 7-8-3 10.23 11.39 §-S-2 6.06 DETERMINATION OF THE PLUTONIUM TO AMERICIUM RATIO IN SOIL SAMPLES FROM ISLAND VERA DOE/ERSP TECH NOTE NO. 2.2 DATED: 21 November 1977 AUTHOR: B. Friesen, DRI Reference Tech Note 2.0 for introductory remarks. Determination of one mean ratio for Vera was made including 238,239,240py and 24lam, Laboratory results of eight soil samples taken from four locations on the island were used to compute a ratio for each sample. The weighted mean of these eight numbers was 1.55 with a coefficient of variation of 17.7%. The range in values was 1.26 to 2.09. Determination of the error term to associate with the mean ratio was accomplished as described in Tech Note 2.0. The Vera data has a weighted mean ratio and error term of 1.572+0.415, as presented below, and these were used in the computations to derive total plutonium estimates and upper bounds. "A" Samples Ratio No. 1 3 5 7 Simple Mean Weighted Mean Weighted Mean (all samples) "B" Samples Ratio Ratio No. Ratio 2.09 1.73 1.62 1.60 2 4 6 8 1.26 1.32 1.33 1.45 1.76 1.34 1.77 1.34 1.572 B-2-11