or sickness ang ather factors,Regardlesg.of the, gouge of individua),4iffer~ ences from the mean, a smoothdegcription, of the body burden and activity inges: tion rate for the population could be adopted. 4 On this besis a declining contin - uous uptake model was used, a Internal Dose Equivalent Rates= a a . . 4 The approximate instantaneous dose equivalent rates for the total body were determined from the body, burden data illustrated in Figures 7 and 8 and from the following equation b where = ql, (4) | ; 3 ¥ H = the total body dose equivalent rate, mRep yt, a I 2 equilibrium dose equivalent rate to the total body per unit body 4 burden, mRem y7! ucim!, q = instanteous body burden, wCi. 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 fol: lowing constant continuous uptake for periods of time much greater than the mein 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 ted ia of 1.2 was needed to adjust for differences in body mags relative to a 70 kil« gram adult, Table 5 lists values of I which were determined from information given in ICRP59 and corrected for body mass differences. 30 wer oi 2 ie * fon 1 Ot Wem 1 wee h sw bh gt tees “e 4 3