“lL It will be noted that no evaluation has been made of the dose due to P24 » or other radionuclides mown to be present in vireo even very brisfly as ceeuwrs in the case of nor-essimilated elements peseing through the GI tract. As far es whole bheGy irradiatioa is eoncerned these radioisoteres are of secondary importance compared with gromd fallout aad internal cs’ ana gp, Ths mwethcdology deseribed and utilized in this work hes made it possible to obtain a measure of the dose arising from gaume-emitting Liesion ectivity on the ground. Evaluation of the whole body dose to man from such sources kas been made through the use of shielding fectors applied to this gamma radiation. Ths pressnt situation in which nuclear weapons testing is no longer being carried ont vill lesd to a genetic dose of 52 murads and a jifetbime dose of 62 mrads to roughly one~half of the population of the tnited States, an increase of approximately 1% over that arising from natural radiation. The continuous testing of nuclear weapons at the rate ocewring between 1954 and 1959 would reevlt in an inereese of the vhole body dose of some 62 over thet occurring naturally. y st afse

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