DETERMINATION OF THE TOTAL TRANSURANICS TO AMERICIUM RATIO ON ISLAND JANET DOE/ERSP TECH NOTE NO. 2.4 DATED: 25 January 1978 AUTHOR: M. Barnes, DRI Soil samples from 25 locations on Janet were analyzed in the laboratory for 238, 239, 240 pu and 241a4m and used to compute ratios. The ratios of total transuranics to americium came from two distinct populations, one corresponding to the Easy/Xray ground zero, and the other to the remainder of the island. The abrupt boundary between these two regions had been located on the basis of aerial survey and IMP surveyresults. Simple mean ratios and standard deviations were computed* for each area; the ratios are listed in Table B-2-4. The range in ratios for the Easy/X-ray area is from 4.63 to 6.67, with mean 5.34 and standard deviation 0.69. The range for the rest of the island is from 2.48 to 4.46, with mean 3.32 and standard deviation 0.42. These values were used to derive estimates and upper bounds of quarter hectare average concentrations of total transuranics. TABLE B-2-4. TRU/AM RATIOS ON ISLAND JANET Location NW 29, 7 NW 21, 7 WB 22, 0 SW 14, 2 NW 14, 8 EB 10, 0 EB 2, 0 WB 6, 0 NE 14, 2 NE 14, 10 SW 2, 8 SW 4,14 SE 4, 22 SE 6,1 SE 6, 8 SE 6, 14 NW 2, 14 NW 6,8 NE 2, 8 NE 6, 16 NE 6, 24 NE 10, 8 NE 10, 22 SE 12, 14 SE 14, 6 "A" Composite 5.13 4.63 5.30 3.67 3.66 3.12 2.91 2.98 2.71 3.20 3.86 3.06 3.04 3.26 2.85 2.90 3.48 4,24 3.72 3.80 3.86 3.22 3.08 3.28 3.43 "B" Composite 5.25 5.06 6.67 3.49 4,01 3.43 3.08 3.15 2.62 3.87 2.97 3.69 2.48 3.09 2.89 3.02 3.80 3.81 3.99 3.46 3.81 2.79 3.10 3.32 4.46 *This method of estimating the ratio and error was later replaced by a method based on more accurate assumptions as described in Tech Note 2.2-A, B-2-13