6 ’ 100 0 200400 es Meters Pacific ocean Fig. 7. A map of Bikini Island showing specific areas of interest for the dose calculations. Existing houses are situated within area l. Areas 2 and 3 are proposed village sites for future housing units. The interior portion of the island is denoted by area 4. the radioactivity from those islands. Since the islanders spend a Gamma exposure rate data considerable fraction of their time reported by Bennett and Beck,> He1d,° in the immediate vicinity of’ their Lynch etal.,’ Gustafson, ° Smith and homes, it may be feasible to take Moore,” and Robison et al.~? were certain remedial actions to reduce used for this purpose. the exposure rates in this area. Their results, in conjunction with a For instance, placing 5 cm of clean simplified area weighting scheme, coral gravel around the houses out yielded the values presented in to a distance of 10 m, a common Table 3. Note that these are rough estimates since the data are scarce practice in the Marshall Islands, . will reduce the exposure rates by a and were collected over a span of factor of two. almost 10 years. with clean soil the top 20 cm of soil The exposure rate over the lagoon was estimated to be 3.3 uR/h due to the cosmic ray Removing and replacing out to a distance of 10 m from the - houses will reduce the exposure contribution and an additional 0.2 rates by a factor of eight. UR/h due to naturally occurring addition, the shielding provided by radionuclides in the sea water. the houses themselves will reduce the -18- In