~ ht (surface burste to air burst retie) comparable to that which has per~ tained in weapons teste to date, Caution showld be emphasized in such extrapolations because our figures have been baged on the United States exposures which are two or more times higher than for Seuthearn Headeshere countries. Further~ more, a ruolear war would be cs a single event, not a continued rate. For inetanse, the genetic effects from gene matations induced would not bulid up to an equilibria, but would gradeally fall off after the first genergtion to that consistent with the then existing “residual background” exposure, Likewise any postulated ries in the mober of leukemia cases resulting fraa external whole body exposure would be limited to a wingle generation except as the "background" exposure was to a leaser extent raised by the Oo~137 of half life about 28 years, Gn the other hand, any Sx-90 effecte would involve several conerations but in diminishing degree, STRMARY The biologioal effects wich may be incurred if past atomic texts or their equivalent are repeated by 1965 may be summarized as follow: 1. Genetic Effects The estimate for the genetic effects in teras of gene mutations ie based on a wealth of setentific data and while not absolutely proven, the burden of proof should lie with those who question it. The esti- mates indicate an increase in the present incidence of "tangible"

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