Table 5. External 30-year doses for each age group. Infants and Case small children 1 2.7 2 Children and Men Women 2./ 3.1 3.1 3.9 4.2 4.5 4.5 3a 3.7 4.0 4.4 4.4 3b 3.5 3.9 4.4 4.2 4a 4.6 4.7 4.9 5.1 4b 4.0 4.3 4.7 4.6 5 6.0 5.8 5.6 6.1 6 6.0 5.8 5.6 6.1 a All . units are . in adolescents rem. Commission on Radiological Protection. puide value and about 70% of the While these guidance values 30-year guide value. for This leaves exposures of individuals and of little margin for additional population groups are not a radiation doses that may be poten- dividing line between safety and tially received by intake of danger, radionuclides via groundwater and any exposures approaching these guides are cause for careful various food chains. evaluation of from Table 4 that residents in the situation, and It is clear exposures exceeding the guides would houses built within the interior require consideration of remedial of Bikini Island will receive measures to reduce exposures and 30-year external radiation doses bring them within the guidelines. exceeding the guide value. As mentioned earlier, Inhabitants in the existing houses thé€se on Bikini Island are expected to external doses may be enhanced by the receive external whole-body presence of beta rays emanating from 90 90, radiation exposures that are beta emitters approximately 40% of the annual activities in the soil. F sa -?)\- such as Sr - It appears