,. . ties of approximately t 40% of the mean was observed in adult oubgroups. Internal dose equivalent d;~tributi.~ii~ in figures one thro”ugh three vcre con:;tructcd by first calculating mean daily activity ingestion rates for di.ffcrcnt subgroups of the Bikini Island population based on the individual measurement data from which Tables 1, 2, and 4 were derived. Secondly, the~e 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. The models describe various re- gimes for the uptake, retention and excretion of internally deposited radionuclides. Finallyj dosimetric models which allow for constant continuous uptake of 90 Sr and stepwise increasing uptake for 137c~ were chosen to determine the internal dose equivalent and dose equivalent commitment for all inhabitants.