total estimates of 0.0084 g 234u, 0.48 g 235u, 0.0025 g 236u, and 3.0 g 238y for Area ll, Site A. Comparison of the vegetation and soil inventory of the 235y source material (Table 6, last column) indicates that a greater portion of the activity deposited farther out from ground zero is on the vegetation. Here again, as mentioned above for plutonium data in Table 3, we apparently are still seeing evidence, at this point in time, of the original partitioning which occurred during fallout deposition, wherein the mean fallout particle size decreased with increasing distance from ground zero. The resuspendable source material consists of a limited size range; consequently, these small particles contribute less activity in proportion to the total amount of contamination present in the soil at points nearer to ground zero. Based upon the data now available for 235y and 2381, a comparison of the vegetation and soil inventory estimates for Area 11, Site A (Table 6, last column), shows that the contamination attributable to vegetation represents an insignificant portion of that which is present in surface (0-5 em) soil. Again we may conclude that less than one-thousandth of the uranium activity present is potentially available to on-site grazing animals via the vegetation transport route. ACKNOWLEDGEMENTS Work was conducted under Contract E(04-1) GEN-12 between the United States Energy Research and Development Administration and the University of California. Supplemental support for sample preparation and analysis was funded by the Nevada Applied Ecology Group, USERDA Nevada Operations Office. 49