or the study indicate that 13705 and 40, body burdens which exceed the minimum sensitivity of both systems are in agreement to within pius or minus 54. RESULTS Persons listed in Tables 9 through 12 have been identified as medically registered residents. This terminology means these individuals reported to BNL 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 90 Sr and 137¢6 in 1979 and did not report for sick call during the April 1978 survey ac 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), 1978, 1979 and 1980. There is a general increase in body burdens of adult males from 1974 to 1977 by a factor of 13.3, and from 1977 to 1978 by a factor of 1.8. The general increase for adult females from 1977 to 1978 was slightly higher than that for males over the same period. cases, In most the January 1979 data are significantly lower than the 1978 with an averaged reduction in the 13765 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 daca 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-