_ 3) oo. — 1m res Estimates of Theoretically Fossible Vpyrcid Doses Due_to Short-Rance Foellout From the Nevada Test site ‘AS Bhown above it ifs possible to calculate, from local méasurecents of ganna and deta ratiation, what radiation exposure to a child's thyréid night theoretically result from a givén deposit of fallout. Since the AEC has reported numerous measurements of gamma and beta radiation, together with the times of measurement, and their relation to a | particular nuclear explosion (the time of which is also given), these data can be converted to estimates of nossible iodine 131 exposures to the thyroid according to the procedures outlinedabove, and given in detail in the Appendix. suca calculations have been made for 189 different readings at various locations following 31 different nuclear test shots condueted at the Nevada Test Site during the period 19521958. ~The overall results are presented in Tables I-V. _ In each case, two estimates of the possiblethyroid dose have been calculated, using the two different observations Cvindscale and Garner) described above. ‘The lower of the two” a estimates yields thyroid dosages which range from 0.6 rad to 555rads. The higher of the two estimates yields thyroid dosages which range fron 4 rads to 2760 rads. accor ing to the higher’ estimate, of ‘the separate locations, 50 received - sufficient fallout toresult in a possible dose of 100 rads or more to the thyroid. In 1S cases even the lower estimate yielded'a thyroid dose over 100 rads. It is evident from this summary that the Nevada tests have produced instances of