The isotopes 233U and 235U are fissile with thermal neutrons and the isotope 238U is fissile with fast neutrons.
Uranium-238 is fissionable. Its just not what we call fissile, which has the added definition of, when fissioned, producing neutrons that can go on to fission more atoms. Uranium-238 is more correctly called fertile, which means that a neutron can transmute it into another isotope, such as plutonium-239, which is fissionable and fissile.Uranium-235, on the other hand, is both fissionable and fissile.
Depleted Uranium
Uranium (especialy the fissile isotope) 235U is fissionable by bombardments with thermal neutrons.
Uranium 235 is a fissile material under thermal neutrons: - uranium 235 is used as a nuclear fuel in nuclear energetic reactors - uranium 235 can be used in nuclear bombs
HEU (Highly Enriched Uranium)
Uranium-235 is the fissile isotope
Uranium atoms are split during nuclear fission. Uranium-235 and uranium-233 are fissile with thermal neutrons and uranium-238 is fissile with fast neutrons.
Uranium 235 is 0.7 percent of natural uranium and is fissile
The fission of uranium atomic nucleus (especially the isotope uranium-235 which is fissile with low energy neutrons) release a huge energy: 202,5 MeV/fission or 1,68.10ex.8 kJ/mol. The nuclear fission is the source of this energy.
This means the breeding of fissile material from non-fissile. Thus for example Pu239 results from irradiating U238 which is not fissile. Thorium can also be used to breed fissile uranium.
Uranium-238 is fissionable. Its just not what we call fissile, which has the added definition of, when fissioned, producing neutrons that can go on to fission more atoms. Uranium-238 is more correctly called fertile, which means that a neutron can transmute it into another isotope, such as plutonium-239, which is fissionable and fissile.Uranium-235, on the other hand, is both fissionable and fissile.
Nuclear power stations receive their fuel (which may not necessarily be uranium) from refineries which process natural uranium into fissile uranium.
Breeder reactors were developed to allow use of non-fissile or fertile fuel, such as uranium-238 and thorium-232, instead of fissile fuel, such as uranium-235 and plutonium-239. They do have fissile fuel in them, but they use its neutron flux to convert the non-fissile (fertile) fuel into fissile form, extending the lifespan of the core.
Depleted Uranium
Uranium (especialy the fissile isotope) 235U is fissionable by bombardments with thermal neutrons.
The fission energy of the fissile isotope uranium-235 is 1,68.10e8 kJ/mol.
Fuel used in a nuclear reactor is uranium, the active isotope is uranium 235 which is fissile.