TABLE 3. #1
SOURCES OF FALLOUT RADIATION
Radionuclide
Halflife*/
Principal
Radiations*®/
b/
Years
cf
eed/
MeV
MV
A ff FF
MeV
Cesium-137 *
30
-
Strontiur9
2
~-
Plutcniun? +
Fraction
absorbed
0.187
.
1.13
-239
; 24,065
5.23
-
-240
6,537
5.24
-
432
5.57
from gut
in
ultse’
.66
1.0
-
3
-
001
-
01
-
.001
.
Annual dose (rem)
per pCi/g in tissuef/
soft
tissue
bone
marrow
.010
.009
-
-005
1.93
0.63
1.93
0.63
2.06
0.68
(muscle)
(liver)j
(liver)
Americium * 4
241
a/ ICRP Publication 38.
b/ Quality factor, 2.
¢/ Quality factor, 1.
-
(liver)
(Radionuclide transformations)
4/ X and gamma rays are amitted whose total contribution to dose would be less than 14.
*/ ICRP Publication 30. Supplement to Part 1. (1980), and ICRP Publications 48 and 51 for
transuranics.
transuranics.
The half-retention time in liver is 20 years, in skeleton 50 years for the
Kr
*/ 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 */.)
* The half-life in the body is about 110 days in males, 85 days in female, and much less
in pregnant women and children.
** The half-life in bone marrow and liver together averages about 35 years.
21
9000528