exposure rates by a factor of two. On the basis of these data, expect to receive first-year and 30-year integral doses of 0.2 and we calculated the integral first-— 4.3 rem respectively. year and 30-year whole body external actions (cases 3a and 3b) reduce the gamma-ray doses for each age group 30-year values by a few tenths of for each living pattern presented in arem. Table 1. somewhat if the Phase II houses The results were then Remedial These values would increase combined by "folding in'' the present (the next group to be built) were population distribution. constructed within area 2 of Fig. 7 The effect of radioactive decay was included in (cases 4a and 4b) the calculation; higher gamma exposure rates however, the because of the additional reduction in exposure rates measured in this area. due to possible weathering, other hand, leaching, If, on the the Phase II houses were or agricultural crop production built within the interior of processes was not included. Bikini Island instead of along the The results of these calculations shores (cases 5 and 6) we would and a comparison with appropriate expect the external dose levels to recommended guide values are given increase to about 0.28 rem during the in Table 4 for each case under first year and 5.9 rem over 30 years. consideration. Of course, these Table 5 lists the dose variations cases are only approximations of between the various age groups for the expected Living patterns, each case. and Because the adults are the results should be regarded expected accordingly. fraction of their time within the doses, The minimum external. as we might expect, may be to spend a considerable interior of Bikini Island as well realized by living on Eneu Island. as on other islands, Estimated values, levels are slightly higher than background, including natural are 0.12 rem during the their dose those of the children. The relative First year and 2.9 rem over 30 differences, years. to be somewhat overestimated A significant fraction of however, are expected these values is due to exposure because aging is not considered in received while visiting other the calculations. islands having higher contamination levels. Future inhabitants of the These doses may be compared with the appropriate guide values, piven existing houses along the lagoon in the title of Table 4, which are road on Bikini Island those set forth by (case 2) may the International,