Noun
uranium-233 (uncountable)
(physics) A radioactive isotope of uranium, 92U, having a half-life of about 160,000 years; it is fissile.
It further either decays to uranium-233 or captures another neutron and converts into the non-fissile uranium-234. citation 233 Pa has a relatively long half-life of 27 days and high cross section for neutron capture (the so-called " neutron poison "). Source: Internet
The uranium-233 bomb was never deployed since plutonium-239 was becoming plentiful." Source: Internet
Uranium-238 has a small probability for spontaneous fission or even induced fission with fast neutrons; uranium-235 and to a lesser degree uranium-233 have a much higher fission cross-section for slow neutrons. Source: Internet
Uranium is weakly radioactive because all its isotopes are unstable (with half-lives of the six naturally known isotopes, uranium-233 to uranium-238, varying between 69 years and 4.5 billion years). Source: Internet