Because of the difference in the amount and kind of food eaten, the dose to some individuals in the population may be two times that shown in the table above. The Federal standard for dose to individuals in the population is 500 mRem/Yr. Calculated 30-Year Dose A. People live 100% of the time on Eneu Island. With Food Whole Body Imports Without Food 2,700 mRem B. 4,700 mRem People live 80% of the time on Eneu Island and visit Bikini Island 20% of the time, but assumes no food from Bikini With Food Imports Whole Body Island is eaten. Without Food Imports 3,700 mRem If people who recently on Eneu, Imports 5,700 mRem lived on Bikini Island return to live the 30-year dose should be increased by 1,000 mRem. DISCUSSION The doses calculated above exceed the provisions in the Federal standard for the 30-year dose of 5,000 mRem depending upon the amount and kind of local or imported foods that are eaten and whether people live all the time on Eneu or spent time else- where in the Atoll. Because of differences in the kinds and amounts of food eaten, some individuals would be expected to exceed the annual whole body and bone marrow standards for individuals of 500 mRem/Yr. The question has been raised how the levels of external radiation and radioactivity in foods on Eneu Island are changing with time. The radioactivity of the two radioelements, Cesium-137 and Strontium-90, that contribute principally to whole body and bone marrow exposures decays to 50% in 30 years, crease again by 50% in another 30 years, etc. and will de- Enclosures 2 and 3 present estimates of the maximum annual whole body and bone marrow doses if, starting with 1979 as the zero time, the return to live on Eneu Island is delayed. Iinclosure 3 indicates that if return to Eneu Island is delayed for about ls 90049861