subgroup at a constant level in prior years. Because this level is at or near the system MDL it is a conservative estimate of the mean body burden of the population. The nuclide 297B1 has been detected in the Enewetak people in 1981 and again in 1982 at levels that substantially exceed the system MDL. In 1981, one individual was determined to have a 207 Ry body burden of 12 nCi. year the highest value was 6.3 nCi. This In the adult male population 15 individuals had body burdens in excess of 1 nCi while in adult females 6 individuals had body burdens exceeding 1 nCi. These data indicate that 20731 is being incorporated into the diet of the population in increasingly larger quantities each year. ‘ Discussions with Bill Robison and Vic Noshkin on January 22, 1982 indicate that the 297Bi and possibly 60co result are reasonable estimates of the population mean body burden. According to Dr. Noshkin, activity concentrations in Enewetak fish for 2075; 60¢9 and 137¢g are 1 pCi/g, 1 pCi/g and 0.8 pCi/g respectively. Using an average residence interval of two years, these activity concentrations, the Robison diet (UCRL 53066 p 40) and the retention functions for 2°7B1 (NUREG/CR-0150-V-2) and ®9Co CORNL/NUREG/TM-190), the predicted body burden for 20781 falls into the - range of 0.24-0.70 nCi and the predicted body burden for 69¢o falls into the range of 3.5 - 10.4 nCi. These estimates are highly dependent on the retention function and the assumed dietary patterns. Further discussions with Drs. Robison and Noshkin revealed that the presence of 20733 and 60¢o may also be enhanced for the Marshallese if they eat the entire fish since 20754 and 6%are present at higher concentrations in the fish intestinal content and liver. Drg. Noskin and Robison also stated that there were detectable quantities of transuranic elements in the non-edible parts of the fish and that LLNL dose projections do not assume that the entire fish is ingested. This dietary question will be investigated on the next field trip to Enewetak Atoll. The rise in the adult male !37¢g body burdens was investigated while the field team was at Enewetak Atoll. Comparison of the first 20 adult male results with past body-burden histories indicated that some individuals were exceeding prior levels. Individuals whose current 137¢g body burden exceeded 75% of the maximum }37¢g body burden observed in their population subgroup during 1981 were interviewed privately following the whole-body count in an effort to determine recent changes in living pattern or dietary habits.