U-235 is commonly used in nuclear fission since it is
What scientists call “Fissile”; which means it is capable
of sustaining a nuclear fission chain reaction. To explain,
U-235 has a very high probability to undergo fission by
a low-energy thermal neutron, that is because there
resulting binding energy from the absorption of
neutron is greater than the critical energy required for
Fission. Uranium-235 has isotopes as Uranium-238 and
Uranium-233.Uranium-238 is fissionable but not fissile,
what It means that it can undergo fission reaction by
high-energy thermal neutron with a low
probability. it cannot sustain a neutron chain
reaction.While Uranium-233 is not found naturally but
it can be made by neutron irradiation of Thorium-232.
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