\
|
As a result, the Sr/Ca ratio in the Fetus and newoorn is approximately
1/8 to 1/10 that of the adult, and the resulting dose to the fetus is less
than that to adults.
The dose to a young infant being breast fed will of course also be less
than that calculated for adults.
The OR body /diet Tor young infants is
0.9;2?4 that is, the young infant nearly equilibrates with his diet.
However, the mothers’ milk, as discussed previously, has a Sr/Ca ratio
~ 0.1 that of the adult diet.
The OR body/diet + en decreases to 0.5 for
a l-year-old and by arproximately 30r4 years of age has reached the adult
2
value of 0.25, 77498
’
3
Similar data are available for 3To5,
Cesium-1327 is metabolized and
turned over more rapidly in presnant women than in nonpre:
AS a result,
isin.
oe
Cs incorroration in
5
are less than would be expected from
adults.
.
was
the fetus and the resulting exposure
normal retention tires cbserved for
mExtrerimental data further indicate that fcr the fetus and for
breast-fed infants the cconcentraticn of
Cs and the resulting dose never
exceeds that of the mother or of other adults.
.
9 -.
in reports by Runco,”
Linume et
3
=
calculated >
for an adult
for
1
al.,
LO
A
.
il
5
and Cook and Snyder,
the dese
5
*
.
Cs is
a conservative
estimate
for +the Pat
fetus
and the newborn.
3.
Dose to Children Relative to Adults
137 Cs
— A considerable body of evidence is available which indicates
that the half-time for
137 Cs in the body is a function of age, with a more
.
11-14
rapid turnover for younger ages.
.
.
.
The biological half-time appears to