The bone-marrow dose-rates to children are calculated ty combining
Bennett's model for children with the approach developed by Sriers
and used in the UNSCEAR report
22
.
.
for estimating bone-marrow dcse from
the mineral or matrix bone dose.
The values used for converting De
doses, to bone-marrow and endosteal cell dcses, are 0.314 and 0.434
respectively.
Bennett's model also extrapolates to the adult case and
°
0a
is combined with the Srtiers approach Tor predicting
the bone-marrow
doses to adults.
The tone mass is assumed to correlate directly with bdocy mass, and
:
>
.
:
these Gata as a function of age are taxen from Srliers.
masses are based upon average data from the U.S.
21
These bedy
rorulation and a factor
of 0.55 was incorrorated to account for the smaller size of the
Enewetekese.
.
The calcium concentration in bone (sCa/g bone) as a
_
function of age is taken from Bennett.
16
In calculating the mineral bone dose (D, dose) in NVO-15C, the
was followed, using
-
z
>
18
so
approach of ICHP
calculated from this mcdel are compared to the 3-rern,yr suide (ICHE
for bone for general cublic.
However,
S)
in assessing the annual dose
both children and aduits, the bone marrow is taken as the critical organ,
.
.
~
and the recormendations in ICRP 11
24
.
are used.
In this model the quality factor is still one (4F = 1), and the “n”
factor is no longer epplicable.
The bone marrow is considered in the
category of sensitive blocd-forming organs, and the corresponding dese
guide for such organs is 0.5 rem/yr rather than the 3 rem/yr for
mineral bone.