ICRP model for 137Cs referred to in the text (Figure D1). For large n; and
r tj
distributed randomly throughout each year, it follows that total int
ted
whole-body dose Q(#) in Bq kg" after t years may be approximated by the
quantity
hs
,
ra\cbas} «rex,
where X is here defined as the braced quantity and where the variafe T,
subsumed in S, is here—in contrast to Eq. (2) above—uniformly distriquted
between 0 and?.
Based on Eq. (4) and the preceding analysis, interindividual vari
ility
in expected dose (D(t)) by time t was characterized by evaluating
(D(t)) = [(0.36 + Y)D,(#) 1+ D,,(t) + (F) {et(R){S)} ,
A6)
in which Y was defined in the text and (S) , the expectation of S with respect
to both T and 8,is given by
iS)=1+
AB +e“[Ei(b,) -Ei(b,)]-Ei(c,)+Ei(c,)+Ln(c,/ cy)
ABKAt
b, =-BKt, i=0,1,
C;
=b.-At,
i=0,1,
and
AB = (B, — By) = (1.107 — 0.9) = 0.207
‘in which Ei is the exponential integral. As such, variability in (D(t))
from uniform variability in F and lognormal variability in both (R)
ises
nd H
(see text). Uncertainty in population-average dose D(t) was characteriged by
evaluating
(A7)
DW =D,@)+D,()+ FBX ,
D-5