-6clearly identifies individuals in the Rongelap population who are not following the recommended dietary restrictions on eating coconut crabs from certain locations. and 241 Body burdens of 99s,, Oy, 239, 240 Bu Am are estimated by the radiochemical analysis of urine samples. Urine sample collections and whole-body counting will be performed every 1 to 2 years at Bikini and Enewetak Atolls when the people return, and every 2 to 3 years at Rongelap Atoll until the results warrant less frequent measurement intervals. SUMMARY _Marshall Islands Radiological Kllowup has consisted of intensive en- vironmental studies at Bikini, Enewetak, and Rongelap Atolls to gather radiological data on the external radiation environment and on radioactivity in food chains. Radiation and radioactivity levels in these atolls are being reduced with time. These changes are monitored in annual or bi-annual environmental surveys. Updated information is used to make conservative estimates of population doses and dose commitments. When people have returned, actual internal doses to individuals are determined for whole-body counting and bioassay data. These results are combined with environmental data on the external radiation environment to complete the total dose assessment picture.