17
TABLE 3 #1
Radionuclide
SOURCES OF FALLOUT RADIATION AT RONGELAP
Half-
life a/
years
Principal radiations#/
A__ b/ - c/
MeV
MeV
7c,d/
MeV
ICRP-derived
limit on dai}y
oral intake
raction
sorbed
from gut in
adults /
pci/d*/
Cesium-137
30
-
0.187
- 66
9860 *
5920 **
Strontium-90
29
-
1.13
-
2470 *
1.0
°
1480 **
°
3
Plutonium-239
24,065
5.23
-
-
30 ** (60)
-001
-240
6,537
5.24
-
-
30 ** (60)
001
Americium-241
432
§.57
-
-
37 ** (67)
001
a/ ICRP Publication 38.
(Radionuclide transformations)
b/ Quality factor, 20
c/ Quality factor, 1
d/ X and gamma rays are omitted whose total contribution to dose wogld
be less than 10%.
Derived from ICRP Publications 30 and 48. The ICRP limit on intake for
workers was divided by 30 (*) to bring the annual committed effective
dose-equivalient to 170 mrem, or by 50 (**) for 100 mren. The
RP linit
includes a factor of 2 to prevent any one tissue receiving nora than 50
rem. That factor is unnecessary in the present low-dosage cas
The
numbers in parentheses give the applicable guide without such
correction.*
£/
ICRP Publication 30.
Supplement to Part 1. (Annals, Vol. 3),
Publication 48 for transuranics.
d ICRP
*John Dunster adds: The intake limits apply to adults. For clildren,
the strontium limit should be divided by a factor of about 3,
ad those
for plutonium and americium by about 2. (National Radiation Pr tection
Board G 87, hug 87.)