Table 5. External 30-year doses for each age group. Infants and small children Children and adolescents i 2.52 2.52 2.85 2.88 - 2.80 4.09 4.74 4.59 3a 3.62 3.96 4.30 4.26 3b 3.35 3.79 4.19 4.09 ta 4.16 4.39 4.05 4.0 4b 3.39 4.21 4.53 4.51 5 5.69 §.53 5.37 $.83 6 5.69 5.83 5.37 5.83 Case Women Men to about 0.28 rem during the first year and 5.6 rem over 30 years. vetween the various age groups for each are given in Table 5. The dose variations Since the adults are expected to spend a considerable fraction of their time within the interior of Bikini island as well as on other islands, their dose levels are slightly higher than those for the children. These differences, however, are expected to be somewhat overestimated because aging is not considered in the calculations. These doses may be compared with the appropriate guide values, given in the title cf Table 4, which are those set forth by the International Commission on Radiological Protection. While these guidance values for exposures of individuals and of population groups are not a dividing line between safety and danger, any exposures approaching these guides are cause for careful evaluation of the situation, and exposures exceeding the guides would require consideration of remedial measures to reduce exposures and bring them within the guidelines. Inhabitants in the existing houses on Bikini Island are expected to receive external whole-body radiation exposures that are approximately 40% ot the annual guide value and about 70% of the 30-year guide value. This leaves little margin for additional radiation doses that may potentially be received by intake of radionuclides via groundwater and various food chains. From the data of Table 4, it is clear that residents in houses built within the interior of Bikini Island will receive 30-year external radiation doses exceeding the guide value.