An average sixty kilogram adult body mass was chosen based on the values observed for male and female adult body weights in the study populations (Con56, Co58, 59, 60, 62, 63, 67, 70, 75 and Le80b). An estimate of body burden for 2395, and 905, was based on use of both Eqs. 1 and 2. The average dietary removal rate constant, k, was first deter- mined using Eq. 1 and sequential urine activity concentration data. Once the av- erage k was determined, Eqs. 1 and 2 were set equal to each other and the body burden was calculated for each urine measurement. After the body burden was de- termined, an estimate of P° was made using Eq. 1 and the average value for k. In this way an average value for P° was obtained from all the urine data. In order to obtain the fifty-year cumulated intake, Eq. 2 was solved for q and the right hand side of the equation was integrated over an ingestion interval of fifty years. Total intakes were related to committed effective dose equivalents by using conversion factors “committed effective dose equivalent per unit activity ingested" given by the International Commission on Radiological Protection (ICRP79). Committed effective dose equivalent per unit activity ingested given by ICRP was mltiplied by 1.17 to correct for body mass differences to yield committed effective dose equivalent per unit activity ingested by a Marshallese adult. Statistical Analysis of Data The adult average standard deviation for 13766, 8575 or 905, atom ingestion rate on the day of return, P°, and the dietary removal rate constant, k, were determined from a set of calculated values derived from a set of adult body~burden measurements and Eq. 2. The standard deviation for the adult aver- age fifty-year cumulated intake was determined by propagation of error techniques involving first and second order partial derivatives and partial cross de10