TAM] 3
Principal Fission Produete
a.
Half-life
- Nuclide
Fission yield from
fission of “35U by
thermal neutrons
Strontium-89
Strontium-90
50.4 days |
28 years
Yttriu-91
58.0 days
- Zirconium-95
63.3 days
Ruthenium-103 °°,
41.0 days
Tellurium-129m
33.0 days
-
Promethium-147
6.3
Niobium-95
35 days
0.4
Rhodium-106
30 seconiis
Bériun-137m
2.6 minutes
6.0
6.0
5.7
2.4
2.52 years
of daughter
-64.4 hours
0.9
OS
32.5 days
290 days
product
Half-life
-Yttrium-90
3.0
30 years
Cesium-137
Cerium-141
Cerium-1h4
|
daughter
4.8
5.8
5.8
~~}
1.0 years
Ruthenium-106
;
%
Radioactive
ae nee rege ES| Ee
--
Rhodium-103m
--
54 minuten
Tellurium-129 74 minutes
1.6 x 10
Todine-129
years
--Praseodymium144 17.5 minutes
Neodymium-144.-2.5 x 101?
Samarium-147 1.3°x 1011
. years
The two major radionuclides with half-lives greater than a year are
strontium~-90 and cesium-137.
Both are soluble in sea water, and tend to remain
in the water, rather than sink to the bottom.
they would sink slowly until dissolved.
Introduced as fallout particles,
Measurements show that most of the
strontium-90 and cesium-137 that has fallen on the oceans still resides above
»
1.
Burton, J. D. "Radioactive Nuclides," Chapter 22,
In Chemical Oceanography,
Vol. 2, Edited by Riley and Skirrow, Academic Press, N.Y. 1965.