be the order oF 10-15 days for 1l- to e-year-old children and increases to
~ 100 days by age 20.
adult life.
It then remains reasonably constant throughcut
The body mass is less for the younger azé ercups, and these
two factors tend to offset each other in dose calculeticns.
Doses to
children are generally less than for ejults as a resuit of the corbination
when the relative adistary intake is
Therefore,
estimates Yor adults are usually a conservative estimat
go
Sr — Reports by. Loutit,
15
16
:
(D
included, children receive a lesser dose than aculis.
dose
14)
of these two offsetting factors.
17
e
.
.
9 NdSr/g Ca in
human bone is greater’
than 6 yr, including: adults.
90
“
-_
nm
4
am
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ct
However, the turnover rete is much more
rapid and the retention time mach shorter for “Sr in aces 1-5.
dose, and the dose
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acpendent urcn the relative interaction of these two Tactcrs.”
Any
of these factors. as well as the difference in dietary intaxe.
The mocel
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226
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ingested 7 Sr are considered to be age invariant.”
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Dose Models ena Diet
Os
4.
5
& recent model Irom
ol,
model the child serarately from the adult. and this model is
applied for estimating the bone doses te children.
AWOS