11
9
DB
=
Weight (kg)
Me atte ere Re ti ee
60 fF
=z
2 7
®
=
5
10
J.
1
Figure 1.
#3
Joecemmmnfimmnrsmnaniimmnrsssaiines
5
¢
dinate
9
4
11 13
mt
15
3
ail.
17
i.
0
Age(y)
3
he
AL.
wien
wih
6
A
a
9
ail
12
Age (months)
Body weight as a function of age,
Figure 2. Body weight as a function of age,
‘development and Ca/Sr metabolism as a
(ICRP, 1972; Cristy et al., 1984; Leggett et al.,
function of age, the readeris directed to papers
1982, 1984; Papworth and Vennart, 1973, 1984;
by the authors of the various age-dependent
Spiers, 1968; Bennett, 1973, 1977, 1978).
1 to 18 y.
0 to 12 mo.
90Sr dose models and their associated references
Dosimetry
Cesium-137
and that no energy is transferred to any other
organ, ie., target (T) organ. In other words, for
The conversion from the intake of !37Cs to
the dose-equivalent rate and integral dose
charged particles, the source organ is also the
target organ. Asa result, the specific effective
energy, SEE, (Te S$), in meV/g_ per
transformation, changes proportionally with
mass for the standard adult; the relationship as
a function of age is
equivalent is based upon the ICRP methods
described in ICRP Publication 30 (ICRP, 1979).
For charged-particle emission, the basic ICRP
methodology is adjusted for age dependence by
using body weights (and organ weights) for
various ages determined by methods described in
the "Retention" section of this paper. It is
assumed for charged-particle emissions that all
of the energy is deposited in the organ that
(SEE) = 20 (SEE)aautt ,
M:
where (SEE),au, is the ICRP value for standard
man, 70 kg is the mass of standard man, and M;is
contains the activity, i.e., the source (S) organ,
S0001b4
the body or organ massat age t. This is the basis
15