The values of Kp were similar for males and females and for residents of Rongelap and Utirik. For 906, on Rongelap a factor of 2 difference between Ke values was observed for males and females. The female parameter for Rongelap Atoll compares with that obtained from the Utirik data. A paired t-test of the Ronge lap male and female data indicates that the male/female difference was highly probable and therefore not significant. This difference leads to a bimodal activity ingestion rate distribution for 90. in the Rongelap population. Data for 6005 and 6525 was not sufficient for analysis for the Utirik Atoll residents. Values for K, observed at Rongelap were assigned to Utirik males and females and body burden histories for population subgroups were reconstructed using equation 1 or 2. Figures 7 and 8 illustrate the derived mean adult body burdens for all significant nuclides studied on Rongelap and Utirik. This method provides a best fit of the data shown in figures 2 through 6, and provides a body burden history during the early years post return at Utirik, a time when body burden measurements were not made. Actual data points are also plotted to demonstrate the fit. The curves shown for Fe in figures 7 and 8 were obtained by setting Ky equal to zero. ture ones. This underestimated the initial body burdens and overestimated fu- Since 53 Fe contributed less than 1.0% to the total dose equivalent an arbitrary assignment of K, based on observed values for the other nuclides was not attempted. During 1974, another series of blood samples was obtained from Rongelap and Utirik (Co75). Analysis for Fe was to be performed; how- ever, no records have been located. of 55 . Once these records are found, a reanalysis . Fe and its impact on early dose equivalent rates will be conducted. A sub- stantial change in dose equivalent is not to be expected. Aes