8 100 0 200400 foO Pacific ocean Fig. 7. Meters <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 a.?° were certain remedial actions used for this purpose. the exposure rates in this area. Their to reduce 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. practice in the Marshall Islands, Note that these are rough estimates since the data are scarce 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 Removing and replacing over the lagoon was estimated to be out to a distance of 10 m from the 3.3 uR/h due to the cosmic ray 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