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
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