resulting fits were worse than when the original data were used (correlation of logs was 0.77 and 0.11 for tively). 2355 and 238 U, respec- Both 2351 and 2381 concentrations for soil and vegetation increase as one approaches ground zero. The increase in vegetation concentration proceeds at a lower rate, however, than that for soil. This is reflected in the decreasing ratic of vegetation mean to soil mean 2354 and 238i, given in the last column of Table 1 for This same 239-240 Pu in vegetation and soil by phenomenon was reported for Romney et aZ. (1975, Table 2) for the other safety-shot sites. Romney attributes this decreasing ratio in higher activity strata to differential particle size distribution that occurred within the fallout patterns of these events. The ratios themselves are of the same order of magnitude as observed for The average concentrations of 2 239-240 Pu at the other sites. 34U and 236 U (Table 2) for vegetation are approximately 100 times less than the vegetation concentrations for 235y and 238 U (Table 1). There is a modest increase in these concentrations for strata near ground zero. The average vegetation concentrations for total U is about the same for strata 2 and 3, which are about twice the level of stratum 1 (Table 2). The estimated inventories of 235 U an d 238 U in the surface 5 cm of soil for A Site are given in Table 3 as 1,045 + 274 and 10,500 + 1,150 grams, respectively. Using the 10 samples (2.5-cm increments) from a single profile sample in stratum 1 of A Site, which we believe to contain only natural uranium (see the footnote to Table 3 and the discussion in the next paragraph), the total amount of natural 2354 and 238) present in the top 5 cm of A Site soil was estimated to be 61.9 + 3.5 and 8,630 + 47.4 grams, respectively. the strata inventories, By subtraction of the inventory resulting from only the safety shot was found to be 983 + 274 and 1,920 + 1,150 grams for 2354 and 2387 | respectively. Note, however, that the standard errors of these latter estimates are very large, resulting in approximate 95% confidence limits of from 395 to 1,570 grams for 2354 and from -564 (or zero) to 4,400 grams for 2385 More information at other locations in A Site is needed to verify our estimates of mean concentrations 130