bimodal activity ingestion rate distribution for 90 7~Sr in the Rongelap popul:: tion. ob Fil E observed at Rongelap were assigned’ to Utiril: males and females and body burden histories for population subgroups were reconstructed using Eq. 1 or'2. Figures 7 and 8 illustrate’ the derived mean adult body burdens for all significant nuclides studied on fonge lap and Utirik. This method provides a best fit of the data shown in Figures 2 through 6, and ia ued cesta kip Siaseene es cal Values for K, + Atoll residents. > ee + . Data for 60 “Co and 65 “Zn were not sufficient for analysis for the Uciri!: provides a body burden history during the early years post return at Utirik, 4 time when body burden measurements were not made. Actual data points are also plotted to demonstrate the fit, The curves shown for 55 “~Fe in Figures 7 and 8 were obtained by setting K r equal to zero. future ones, This underestimated the initial body burdens and overestimated Since 93 p¢ contributed less than 1.0% to the total dose equiv: lent, an arbitrary assignment of Ke based on observed values for the other i - reported. Analysis for 955 has yet to be s obtained from Rongelap and Utirik (Co75). vile, * During 1974, another series of blood samples was A recalculation of 3p, body burden and its impact on early doar equivalent rates will be conducted when the data is made available. A subst-n- tial change in dose equivalent is not to be expected. ; . . . . Figure 4 and Figure 6 illustrate the observed adult histories of I37 66 mean urine activity concentrations. adults were plotted. Figure 7. 90 Sr and Mean values for adult males or a1! Measured values for L376 body burdens were also shovi in A much smoother curve was plotted in Figure 7 and it was determi ind that the callection and analysis technique for urine samples introduced the . . tional variations. 2 yeeRS wdi- . . . 137 : On the basis of this observation for Cs, a smooth b«1: 17 “eet HR: rere re week er hae at aon Bey stem noA ‘2 actos ES clides was not attempted.