INTERNAL VOSE EQUIVALENT RATES The approximate instantancous dose equivalent rates for the total body were dete mined from the body burden data illustrated in figures 7 and 8 and from the 1ollowing equation H=qtTI, (4) where the t tal body dose equivalent rate, mRem yl, I equilibrium dose equivalent rate to the total body per unit body burden, "iW H mRem y~! pci-!, q = instanteous body burden, UCi. The approximate nature of the estimate was due to the assumption that the radioactive atoms were distributed among the body tissues as they would be following constant continuous uptake for periods of time much greater than the mean residence time for the total body. assumed. In the case of 905, 86% of equilibrium was These assumptions were not used in the estimate of the total dose equivalent. In addition, since mean adult body burdens were computed, a factor of 1.2 was needed to adjust for differences in body mass relative to a 70 kg adult. Table 5 lists values of I which were determined from information given in ICRP59 and corrected for body mass differences. 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 3-6 months (Co80b). The composite dose equivalent rate indicated that a broad 16