ties of approximately + 40% of the mean was observed in adult subgroups. Internal dose equivalent distributions in figures one through three were constructed by first calculating mean daily activity ingestion rates for different subgroups of the Bikini Island population based on the individual measurement data from which Tables 1, 2, and 4 were derived. Secondly, these mean activity ingestion rates and individual residence interal values we used as input data to mathematical models applied to inhabitants who did not participate in our personnel monitoring programs. gimes for the uptake, radionuclides. The models describe various re- retention and excretion of internally deposited Finally, dosimetric models which allow for constant continuous uptake of 906, and stepwise increasing uptake for 13765 were chosen to determine the internal dose equivalent and dose equiva~ lent commitment for all inhabitants. tween the years 1969 and 1978, Thus for residence periods be- these figures evince a maximally ex- posed person receiving a whole body dose equivalent and commitment of 3 rem, and a population average dose equivalent and commitment of 1.2 rem from man-made radioactivity on Bikini Island. N. Greenhouse R. Miltenberger E. Safety and Environmental Protection Division Brookhaven National Laboratory Upton, New York 11973 Wa 50k Lessard