"Let MT = the number of megatons of fission energy released, W sr = the number of grams of available natural strontium per square mile of area, = the number of grams of natural strontium fixed in the human skeleton at maturity, = the number of gram3 of strontium-90 fixed in the skeleton which is considered to be the level of interest (MPC ox any other standard), ‘s the number of grams of strontium-90 produced by the release of 1 Mf of fission energy, = the area of the earth in square miles, then Mr Since there is little chance that m will be changed appreciably by future measurements and A is fixed, this relation can be simplified as follows (taking m = 1000 gm and A = 2 x 108 mi“): 7 MI= 2x10 exw. Taking T to be 5 x 1077 em (1 microcurie, the international Mec), B= 0.7 gm, and W= 1.7 x 107 gm, it is found that MI is 2.5 x 104, assuming uniform world-wide distribution. It is instructive to apply the SUNSHINE model to the data collected thus far. The following table summarizes the situation. TABLE 8 Theoretical Lower Actual Val- Limit of the Thresh- ues Measured old for Injury Amount Fission Yield Detonatea Amount sr90 Deposited Amount sr90 in Bone To Date 4 ho Mr 719 * 10 ME 2002 gm/acre -0084 (0.129 gm/mi® (1) 5.38 x 10 1000 §.U. 0.5(3) 112 Theoreticulation Ratio Actual/ Theoretical 1.0. -6(2) -026 31