s~ i]
TABLE an INFORMATION FOR CALCULATING MAXIMUM INTERNAL ANNUAL DOSES
a
Radionuclide
1
:
Tnex
Critical Organ
90,
b
Tex +8 yr
(yrs)
Bone
Whole Body
1.83
VES
weeee ee ee
° ee
Lung
19.00
-
Factor
L/K
22
30
23.10
18,22
25. 65
0.0433
30
2keui
0.0474
0.0397
-
22
30
25.17
-
30
28.01
10
,
K
30
13
Pu
(yrs)
-
«
137...
Dose Period r
{yrs}
4.82
Dose Conversion
17, 75
0.0549
0.0390
0.0563
0.0357
“rhe time at which the internal exposure rate becomes maximum for a particular radionuclide and target organ
is denoted by Tnax’ and is calculated from the formula
T
max
=
fn ()_/_)
r
m
h
m
=X
r
’
.
—_
‘
where yy is the biological decay constant for man, and A, is the radioactive decay constant for the radionuclide.
bassumed 8-year maturation periods for pandanus, breadfruit, and coconut seedling trees.
“rhe period of time over which the dose rate is integrated is denoted by T.
'
|
Gan empirical factor used to relate the maximum annual dose to an integrated dose for a longer period is denoted
by K. The relation is given by
D
.
T
max’
Dr
K°
" The factor K is determined from equations given in NVO-140, pp, 537-38.
+ seen