2. Birth Defects Risks Table 3 gives the calculations B. for the estimates of birth defects. Risk Estimates Based on BEIR-111 Table 4 gives risk estimates based on were calculated for comparison Bikini book. BEIR-111 risk coefficients. These purposes(’only and were not used in the The highest estimates for cancer risk result from using the linear relative risk model and are about the same as those given in Table 2 for the relative risk model. the linear-quadratic absolute risk model and are slightly less than those for the absolute model in Table 2. risk are concerned, Thus, as far as estimates of cancer those obtained using risk coefficients are in the same general from The lowest estimates result from from BEIR-I range as those obtained using risk coefficients BEIR-111. Risk estimates for birth defects obtained using the risk factor from BEIR-I gives values about three times those obtained using the upper value of the range of risk factors given in BEIR-111. If BEIR-111 risk factors for birth defects represent a more enlightened assessment of this potential consequence of radiation exposure than the factor taken from BEIR-I for overall health defects, then the estimates in the Bikini book may be conservative by a factor of three.