EET St. George, Utah se Lincoln Mine, Kev Mesquite, Kev 4.0 x 1074 1.7 x 197) l 3 1.5 1.0 Groom Mine, ev 3.4 x 107% 7 0.35 Hioche, Hev 2.0 x 10~ 3 0.015 he method used in eatirating doses to the lungs is given im Appendix XK, Ome essurption made was uniform: distribution of radietion whieh, ef course, is not entirely accurate, The criteria previously established by an 4d Hoo Jangle Pearibility Corsittes (kashington, 5.C., duly 13, 1951}, for air coneentrations was “at a point of hunan habitation, the activity of radioactive particles in the atmocphere, averaged over a peried of 24 hours, shall be limited to 100 mlerocuries per cubic meter ef air (correspending approxizately to a ground level gama intensity of 3 xr/br). DOE/NV. "The <4-nour average radioactivity per cubic meter of air, due to suspended particles having jiaseters in the range 0 ricron to $.G microns, shall not exceed 1/100 of the above; nor is it desirable that any individual particle in this sise range have an activity greater than 10-< sicroouries calculated 4 hours after the blast.” In the January 20, 1954 meeting of the 4d Eoc Connittee the basie for recoumending the above air concentratiom was ciscussed. Eseentially, these eriteria were selected by estimating the casa dose that night be delivered by the pessing of a radioactive cloud. ‘ince there are better 55