ee eee Sapee eo, vay : n ii Pa 60 ‘Co and 6525 were not sufficient for analysis for the Utirit Atoll residents. Values for Ke observed at Rongelap were assignedto 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 2 Bieues= Data for ura h fe Dag tion, rr s cag oer lle bimodal activity ingestion rate distribution for 905, in the Rongelap popula-~ Lewed. ee nee ate cigps tars a x os adult body burdens for all significant nuclides studied on Ronge lap 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 99 Fe in Figures 7 and 8 were obtained by setting Ke equal to zero. future ones. This underestimated the initial body burdens and overestimated Since 55 ~““Fe contributed less than 1.0% to the tocal dose equiv: lent, an arbitrary assignment of Ke based on observed values for the other iwclides was not attempted. During 1974, another series of blood samples war obtained from Rongelap and Utirik (Co75). reported. Analysis for 7356 has yet to be A recalculation of Fe body burden and its impact on early dose equivalent rates will be conducted when the data is made available. A substan- ‘i “ g a i g tial change in dose equivalent is not to be expected. Figure 4 and Figure 6 illustrate the observed adult histories of 90. and 137 . coe . Cs mean urine activity concentrations. adults were plotted. Figure 7. Mean values for adult males or «1! Measured values for Lio. body burdens were also shown in t oa ij A much smoother curve was plotted in Pigure 7 and it was determincd that the collection and analysis technique for urine samples introduced the addi- ; ar tional variations. os . . . 137 On the basis of this observation for Cs, a smooth braid. 17 TE at pee “rete + “4, TR: reper: . rae