TABLE 3. #1
SOURCES OF FALLOUT RADIATION
Radionuclide
Halflifes’
Years
Principal
Radiations®/
bs
cf
MeV
MeV
A_f
Cesivm-137
30
-
0.187
Strontium
90
29
-
| 24,065
Plutonium
-239
-240
"
Americium
-241
eds
F
Fraction
absorbed
from gut
in
adults*/
Annual dose (ren)
per pCi/g in tissuef/
soft
tissue
bone
marrow
MeV
.66
1.0
-010
(muscle)
-009
1.13
-
3
-
005
5.23
-
-
-001
1.93
0.63
6,537
5.24
-
-
.001
1.93
(liver)
0.63
432
5.57
-
.001
“/ ICRP Publication 38.
b/ Quality factor, 20.
c/ Quality factor, 1.
-
(liver)|
2.06
(liver)
0.68
(Radionuclide transformations)
4/ X and gamna rays are anitted whose total contribution to dose would be less than 16%.
¢/ ICRP Publication 30. Supplement to Part 1. (1980), and ICRP Publications 48 and 5] for
transuranics.
transuranics.
The half-retention time in liver is 20 years, in skeleton 50 years for the
t/ Dose in 1 year for an activity of 1 pCi/g maintained for that year in the tissues which
receive the highest dose when the radionuclide is ingested. (Reference, See Footnote */.)
21