Table 5 Total Body Equilibrium Dose Equivalent Rate per Unit Total Body Burden I, Ox mRem yu yci7l Be 2x 10° 600, 6x 10° Oo7 4 lx 102 905, 38 3 x 10° 1370, 2x 107 26 27 30 55 Figure 15 illustrates the relative contribution to the composite dose equivalent rate for each dosimetrically significant internally deposited nuclide. For the average Rongelap adult, the residence interval begins June 1, 1957; however, many adults were reported to have resettled during the next 3 to 6 months (Co80b). The composite dose equivalent rate indicated that a broad maximum of approximately several hundred millirem per year persisted for several hundred days. Most of the dose rate is-eftributable to the 1370, component. Ce- sium 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. Figure 16 illustrates two possibilities for the Utirik dose equivalent rate resulting from the O70 body-burden history during the first three years Lm 65 Zn The higher body-burden resulted from use of the two measured post~return. 31