given in Table 1 of our 1979 Assessment (page 30) for the linear-quadratic dose-response model become 2.81 and 7.70 for the absolute and relative risk projection models and those for the linear dose response model become 6.58 and 18.19 under the absolute and the relative projections respectively. These are not large changes constitutes a small decrease), (indeed one but the largest is roughly two fold. Genetic Risk Estimates. The dose estimate revisions make very little difference in the numerical genetic effects estimates given in our 1979 Assessment example, (page 25). For the first generation increased risk estimate upper bound estimate is changed from 177 to 218 cases per million live births or, more meanfully perhaps, from about 0.08 to about 0.1 cases among the roughly 49 cases expected from other causes in the next Enewetak generation if the population just replaces itself. Similarly, the absolute upper limit of credible risk of genetic ill health (page 26) for a child born on Enjebi eight years from now who has a child at age 30 is increased only from roughly 3 to 4.5 chances in 10,000, which must still be compared with the roughly one chance in ten normal risk, Cancer Risk Estimates. a very small increment indeed. The effect of the newer dose and cancer risk coefficients is also small. A comparison of the new with the old estimates is shown as Table I. It