Table 4. Estimated integral whole-body external gamma doses for the first year and for 30 years. Values include contributions due to natural background radiation of about 0.027 rem for a first-year dose and 0.80 rem for a 30-year dose. For comparison, the federal radiation guide (total of external and internal doses) is 0.5 rem per year for individuals and 5 rem for 30 years for a population average. These guides are in excess of natural background. Estimated doses Case Description (rem) First year 30 year 1 Village on Eneu Island 0.12 2.9 2 Residence in houses already constructed 0.20 4.3 3 4 5 6 along lagoon road on Bikini Island. Residence in houses already constructed along lagoon road on Bikini Island with following remedial actions taken: se ~ a. Placing 5 cm of gravel around houses 0.187 4.13 b. Removing and replacing top 20 cm of soil around houses 0.18 4.07 . 0.227 4.87 0.20° 4.47 0.28 5.9 0.28 5.9 Residence in Phase II houses constructed along lagoon road within area 2 of Fig. 7 with following remedial actions taken: a. Placing 5 cm of gravel around houses b. Removing and replacing top 20 om of soil around houses Residence in Phase II houses constructed within the interior of Bikini Island . ; Residence in Phase II houses constructed within the interior of Bikini Island “The exposure rates in the immediate vicinity-.of the houses have been reduced by a factor of two and eight for remedial actions a and b, respectively. However, we have estimated that only 35 to 40% of the Bikinian's time will be spent in the vicinity of his house; therefore, the reduction in total dose is relatively small because the total dose includes the exposure received from the areas where he spends the other 60 to 65% of his time. -20-