Subsequent to the return of Rougelsp people to their home island, the 1237 c body burdens of 13765, 6575 and 9°sr yose to lov levels, but these reached equilibriua with environmental sources by 1961. No effects from these iso- topes have been datected?s9, Populations Under Study A total of 64 men, women and children were present on Rongelap Island. The 18 who were exposed to fallout on Ailingnae were Rongelap inhabitants who had gone to the edjacent atoll for fishing. Shallese people received fallout radiation. On Utirik Island, 157 Maz- In addition, 28 American ser- vicemen on Rongerik Island and 23 Japanese fishermen on the boat, “Lucky Dragon," were subjected to sublethal doses of radiation from the fallout (Table II). In the Rongelap group, 12 of the 64 were under 5 years of age, 18 were between 5 and 16 ycars, and 34 were over 16 years of age. children, 19 were under the age of 10 years. utero on Rongelap. Four fetuses were exposed in In the Ailingnze group, 6 of the 18 were children, all under the age of 10 years. of age and younser. Among these On Utirik, 63 of the 157 were children 15 years Fifty-four of the 63 were under 10 years of age. Rongelap was considered to be habitable in 1957. people were transferred back to their home island. At that time the When repatriation toox place, a group of about 200 unexposed people also moved to Rongelap.: This non-exposed group, rostly relatives and former inhabitants of the islend, has served as the comparison population for the continuing studies of the exposed people, Awong ‘the non-exposed group, 48 wore under 10 years o £ ave in Morch 1954 and 8 were between 10 end 15 years of agel®, 5001338 , . -