Table 5 Total Body Equilibrium Dose Equivalent Rate per Unit Total Body Burden, ox mRem y~! pci-! 9356 26 2 x 10° 600, 27 6 x 102 6508 30 1 x 107 90¢, 3 x 107 137 o6 55 2x 107 38 maximum of approximately several hundred millirem per year persisted for several hundred da’s. component. The majority of the dose rate is attributable to the 137, 8 Cesium dominated over the entire post return period and would be of prime concern for populations returning to a contaminated environment years after a fission-type initiating event. Figuce 16 illustrates two possibilities for the Utirik body burden history during the first three years post return. The higher body burden resulted from use of the two measured 6520 body burden means for adults on Utirik and the observed dietary rate constant from Rongelap. [It was observed on Rongelap that 031% of 6 on was removed from the diet pathway each day in addition to radioaccive decay. Additionally, reduction in dietary radioactivity on Rongelap had been ubserved for 137, S, 90 Sr .and 6005 to be greater than that predicted by radioactive decay alone. Instantaneous reduction fractions very similar to 17