Table 2.
This ratio is in good agreement with the ratio of the mean potassium
concentration in human milk and the mean adult femaie potassium body burden at
- es
age 30 of 5.5 « 10
Dose Calculations
The
137
“~‘Cs
ee
“6
ml
-1
,,
(ICRP 75).
oo,
.
oe,is
daily ingestion rate of the infant
i,
.
ais
tivity concentration in human milk (which
body burden),
related to:
the
,.
dependence on the motcher's
the milk uptake rate and mass of
the
infant.
137 Cs
137 Cs
acm
Milk uptake for
breast fed infants is assumed to equal the milk secretion rate of the lactating
female (Me 55).
Table 3 lists the mean value and ranges of anatomical and
radiological parameters (ICRP75, Ki75) used in the computation of 1376, body
burdens and dose equivalents.
Dose equivalents for the infant were based on dose equivalent per unit
cumulated activity for an average infant (mass 7,000 gm, trunk length 23 em).
The absorbed dose per unit cumulated activity was determined from a total body
source and target absorbed fraction, 9, of .17 (Table 3) for the .662 “eV photon (Ya 75) and was calculated for 13765 as follows
$= 51.2 (LF,ii
£, + £6.ii
a, J.)
‘i
mn
where
(1)
E. ™ average energy of the ith particulate radiation MeV,
F. = average number of ith particulate radiation with
energy Ey per disintegration,
G. = discrete energy of the ith photon, MeV,
H. = average number of ith photons with discrete energy
G. per disintegration,
m * mass of the target, g.