Table 5 Total Body Equilibrium Dose Equivalent Rate per Unit Body Burden tT, “Ne mRem y~! ucim! 25 F6 2x 10° 6005 6 x 107 655, 30 lx 107 90... 3 x 107 13706 55 2x 10° 26 27 38 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 l, 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 attributable to the 1376, 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 post-return. 65 Zn body burden history during the first three years . The higher body burden resulted from use of the Cwo measured 31 65 zn