Methods of Dose Calculation
The external dose measurements and
model calculates the dose with a qual-
calculations from gamma-emitting
dry factor (QF) of 1 without the use
radionuclides, primarily 37 C5 and
60
Co, distributed in the soil on
of an m factor for nonuniform distribution in the bone.->
Bikini and Eneu Islands has been
conditions the bone marrow doses
described in detail.”
should be compared to the 0,5 rem/yr
Previous studies of the aged fall-
Under these
guideline for members of the public
out? in the Marshall Islands and the
rather than the 3 rem/yr criteria’ +8
analytical data reported here indicate
used if mineral bone doses are cal-
that only
culated using an m factor of 5,249
60,
>
906)
>
137A,
,
241
An,
239,240 Pu
and plutonium isotopes contribute to
The bone liver doses of
the internal dose.
calculated using the ICRP lung
The doses resulting
were
from the inhalation and ingestion of
model 19,20 and the most recent param-
these nuclides have been calculated
eters for transfer from the lung,
using the most recent models, transfer
across the gut wall, and for retention
coefficients, and turnover times avail-
time in the critical organs, 1777+
The dose from
able.
I
summary description of this model and
96, was based
upon a single-exponential model with a
associated transfer and retention
biological half time of 10 da.’
coefficients is given in a recent
The
transfer across the gut to.whole body
13/7
was taken as 0.3.
For
paper by Martin and Bloom. “-
Cs a two-
component exponential function was
used.
Table 4,
All of the 13766 ingested is
assumed to reach the whole body.
Of
the total 13765 reaching the body,
Disintegration energy (E) and
fractional deposition (F) in
reference organ of five major
radionuclides,
15%
has a biological half time of 1 da
Bone
Radionuclide
and 85% has a biological half time of
115 days, 1°
The critical organ for 0c) dose
calculation is bone marrow.
from
90
The doses
.
.
.
Sr in this report are given for
F
B
13765
0.59
=
_
1.0
206,
1.1
0.3
_
_
600,
0.87
—
-
0.3
used in the UNSCEAR reports. 4
of 10, i.e.,
53°
a
1.35(-5) 1.20(-5)
“Numbers in parentheses
-1l1-
Whole
Body
F
239,240,
This
Liver
E,
MeV
bone marrow and are calculated by the
11-13
method developed by Spiers
and
Mmm gs |
A
—
indicate powers
(-5) indicates x 10
“>