We believe our most significant findings are: l. The dependence of radicstrontium uptake on soil calciun, 2. The remarkable uniformity in the radiostrontium activity 18 biological 3, Our inability to account for the bulk of the debris from MIKE. 4, The absence of grossa fractionation of either $r89 or Sr9O In samples naterials when the concentration is expressed as d/min/gm Ca. analysed, The data provide a tentative measure of the significance of muclear detonations to date. What would we find a few years there were no intervening detonations? Milk being the princ of human Ca, we have estimated the rate at which Sr90 would from soil, assuming the availability remains as it is. © Ap depleted F discusses half life from soil can vary widely in pastures that feed mi Conet 1.5 to this question for two extreme situations and concludes that U.5 years for fields from which cowpees are cropped continuoy bdological to cows that feed elsewhere, and 170 years for pastures in w feed. The bulk of the Sr7O in Case I is transferred to fi cows fed by cowpeas grown elsewhere. Here is an example of oe provles obt ained, 6 a/ Ca is @ representative figore for $r99-9% of which aout 1.5 d/s is Sr, This compares with 870 d/m/gm Ca at tolerance (1 pcolin a 7 Kg skeleton containing Ca). The ratio of the observed activity to the tolerance activity thus approximate - Potential deposition of material now stored in the atmosphere TER eas Thus, we can tentatively conclude that if the Sr’ in soil isinot depleted by biological and/or physical processes in a decade or two, formed biological calcium in Eastern United States is now at with the soil (as seems to be the case), a skeleton which beggns to develop at this tine would be expected to contain .1 of the tolerancp burden will diminish slowly with radiosct AW'decay reduced by a shift in the equilibrius between soil but can burden. This ami biological calcium, 00131986.043 1091012