4 i of the study indicate chat. /?7cs and 40% body burdens which exceed the minimum sensitivity of both systems are in agreement to within pius or minus 5h. RESULTS Persons listed in Tables 9 through i2 have been identified as medically registered residents. This terminology means these individuals reported to 3NL doctors for sick call during the April 1978 field survey and were assigned a registration number. For continuity, these numbers were retained by SEP for radiochemical analysis of urine identification. Individuals who donated urine for analysis of 995, and 1370, in 1979 and did not report for sick call during the April 1978 survey at Bikini Atoll have been termed non-medically registered. Persons who had not resided at Bikini Atoil for more than three years as of January 1979 or had never resided at Bikini Atoll are Labeled as comparisons. Tables 9 and 10 present a list of adult individuals who were counted in 1974 (CO 75), 1977 (CO 77), bedy burdens of adult males 1978, 1979 and 1980. from 1974 to to 1978 by a factor of 1.8. There is a general increase in 1977 by a factor of 13.3, and from 1977 The general increase for adult females from 1977 to 1978 was slightly higher than that for males over the same period. In most cases, the January 1979 data are significantly lower than the 1978 with an averaged reduction in the 137 Cs body burden by a factor of 2.9. The May 1979 and August 1980 data follow the expected decreasing trend. Tables 11 and 12 summarize the 1376, body burden data collected for adolescents and children. [It must be noted that data reported here are uncorrected for height and weight differences between subjects and the standard, up to 15% deviations have been reported for adult data (MI 76). Body burdens of adoles-