Table 5. Estimated integral whole-body, external gamma doses for the first yr and for 30 yr. Values include contributions resulting from natural background radiation of about 0.027 rem for a first-yr dose and 0.80 rem for a 30-yr dose. For comparison, the Federal radiation guideline (total of external and internal doses) is 0.5 rem/yr for indi- viduals and 5 rem for 30 yr for a population average. lines are in addition to natural background. Pattern® These guide- Estimated doses (rem) First yr 30 yr Description 1 Village on Eneu Island. 0.12 2.9 2 Residence in houses already constructed along lagoon road on Bikini Island. 0.20 4.3 3 Residence in houses already constructed along Placing 5 cm of gravel around houses, o0.18° 4.1° Removing and replacing top 20 cm of soil around houses. o,18° 4.0° lagoon road on Bikini Island with the following remedial actions taken: a. -b. 4 . Residence in Phase II houses constructed along lagoon road within Area 2 of Fig. 2 with the following remedial actions taken: a. Placing 5 cm of gravel around houses, 0.22° 4.8? b. Removing and replacing top 20 cm of soil around houses. 0.20° 4.4 5 Residence in Phase II houses constructed within the interior of Bikini Island. 0.28 5.9 b Residence in Phase II houses constructed within 0.28 5.9 the interior of Bikini Island. “See Table 2. b . . . . 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 remainder of his time. (Patterns 2, 3a, and 3b); the 30-yr Island lead to the lowest external doses (excluding natural background) exposure doses. for these pattems range from 3.2 to 0.093 rem and the integrated 30-yr 3.5 rem. Living patterns on Eneu 5009963 The first-yr dose of dose of 2.1] rem are nearly one-half —-}3-