The external dose received by the retunned Bikinians will depend upon where various people are located, and for what periods of time, within the island complex. or children. Location in turn depends upon whether they are men, women, The returnees (see Age Distribution table) will probably . consist of about equal numbers of men and women. The amount of. time likely ‘to be spent in the four radiation domains (village area, beach, interior, and lagoon) by the various groups within the population are shown in Table 1. Probably the most time will be spentin the village area, where the dose rate is intermediate between beach and interior levels. The dose rate may be reduced one half by covering the ground ‘with an inch of clean sand or soil. This in essence will ‘be done in the village area through the custom of covering the dirt floor and the yard with several inches of polished coral pebbles. The expected integral dose to the population over various time intervals starting in 1970 is shown in Table 2. The actual internal dose derived from eating native foods is somewhat more difficult to assess. (1) However, three points should be borne in mind. As in the past, the natives will doubtless take much of their sus- . tenance from the lagoon and ocean. (2) Edible land plants will be severely limited, at least at first, due to the sparcity of fruit-bearing coconut, pandanus, etc. (3) The Bikinians have become accustomed to eating new foods, and will probably continue to eat such things as rice, flour, canned meat, and powdered milk. The only radionuclides of biological importance | found in foodstuffs collected at Bikini were 90cy, 137¢, and 55Fe. Other