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 BEIR-111 r’ sk coefficients. were calculated Bikini book. for comparison purposes~only These and were not used in the The highest estimates for cancer r“ sk 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 The lowest estimates result from absolute risk model and for the absolute model in Table 2. are slightly less than those Thus, as far as estimates of cancer risk are concerned, those obtained using risk coefficients are in.the same general range as those obtained from BEIR-1 using risk coefficients from 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.