Table 4, Estimated integral whole-body external gamma doses for first year and for 30 years. Values due radiation of about 0.027 rem for first-year dose and 0.80 rem for 30-year dose. For comparison, Federal Radiation Guide values (total of external and internal doses) for individuals are 0.5 rem for first year and 5 rem for 30 years. Estimated doses (rem) Case , Description ‘First-year 1 Village on Eneu Island 2 Residencé in houses already constructed along 3 «Residence in houses already constructed along 0.12.6 22 9432.67—. = /,: . lagoon road on Bikini Island. ¢ 0.20-,92 72 434.16 ~ ¢ =>, 5 lagoon road on Bikini Island with’ following remedial actions taken: 40 a. Placing 5 cm of gravel around houses 0.20 4.04 b. Removing and replacing top 20 cm of soil around houses 0.19 3.87 0.22. 4.47 ~0.21 4.29 Residence in Phase II houses constructed along lagoon road within area 2 of Fig. 4 with following remedial actions taken: a. Placing 5 cm of gravel around houses b. -Removing and replacing top 20'cm of soil around houses 5 6 30 year ‘ . Residence in Phase II houses constructed within the interior of Bikini Island —-—s 0. 287-30274,2535 59 — St Residence in1 Phase II houses constructed within the interior of Bikini Island ; Dy TL op bintion Ext Tat, . topes. Ext. = 0.28 5.59 4,79 ~ 3.34 ah 3 Kan aiyyrs -, 4 = 6259 ~ 2172 = 08 OA one yen The results of these calculatioris and a comparison with appropriate recommended guide values are given in Table 4 for each case under consideration. Of course, one should Keep in mind that these cases are only approximations of the expected living patterns and should regard the results accordingly. . The minimum external doses, as one might: expect, may be realized by living on Eneu Island. ‘ a ao Estimated values, including natural. background, are 0.12 rem during the first year and 2.7 rem over 30 years. , A significant fraction of these values is due to exposure received while visiting other . islands having higher contamination levels. Future inhabitants of the existing houses ey constructed along the lagoon road on Bikini Island, case 2, may expect to receive first- year and 30-year integral doses of 0.2 and 4.2 rem respectively. . Remedial actions, cases 3a and 3b, reduce the 30-year values by a few tenths of arem., These values would increase somewhat if the Phase II houses were constructed within area 2 of Fig. 4, cases 4a and 4b, due to the higher gamma exposure rates measured in this area. If, on the other hand, the Phase II houses were built within the interior of. Bikini Island instead of along the shores, cases 5 and 6, one would expect the external dose levels to increase a 8 Te GisPa‘ n Tyteriy 4 cd a wh 0. ° © | yr M43 Roms .. Gwinmel ty Brea