Module 101 Properties of Uranium
An unwanted byprodu ct of 233U
production in a breeder reactor. Due
to its much shorter half-life, 232U
contributes most of the radioactivity
in samples of 233U.
Manufactured by irrad iating 232Th
1.6 x 10 5 y
with neutrons. It is a criticality
hazard because it is fissile.
A decay product of
U. It is
concentrated with 235U during
enrichment. Highly enriched uranium
2.5 x 105 y
contains about 1% 234U. Most of the
radioactivity of enriched uranium is
from the 234U.
Fissile with slow neutrons; therefore,
it is of primary interest for reactors
7.1 x 108 y
and weap ons. If not ha ndled safely,
an accumulation of
Some 235U is converted to 236U in
2.3 x 107 y
reactors. It is also present in
reprocessed reactor fuel.
The most abundant uranium isotope.
It is fissionable with fast neutrons;
4.5 x 109 y
however, it is not fissile (i.e., with
thermal neutrons) so it is not a