expect to receive first-year and exposure rates by a factor of two. 30-year integral doses of 0.2 and ery On the basis of these data, 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 a rem. 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) because of the the calculation; however, the higher gamma exposure rates additional reduction in exposure rates measured in this area. due to possible weathering, leaching, other hand, 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 If, on the 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, Table 5 lists the dose variations these cases are only approximations of between the various age groups for the expected living patterns, and each case. the results should be regarded expected to spend a considerable accordingly. fraction of their time within the doses, The minimum external Because the adults are interior of Bikini Island as well as we might expect, may be realized by living on Eneu Island. as on other islands, their dose Estimated values, including natural levels are slightly higher than background, are 0.12 rem during the those of the children. first year and 2.9 rem over 30 differences, however, are expected years. to be somewhat overestimated A significant fraction of The relative these values is due to exposure because aging is not considered in received while visiting other the calculations. These doses may be compared with islands having higher contamination levels. Future inhabitants of the the appropriate guide values, given existing houses along the lagoon in the title of Table 4, which are road on Bikini Island (case 2) may those set forth by the International -19-