It was discovered in 1935 by Arthur Jeffrey Dempster.

does radioactive dating with isotopes of uranium and thorium provide-37does radioactive dating with isotopes of uranium and thorium provide-16

It is the only fissile isotope that is a primordial nuclide or found in significant quantity in nature.

Uranium-235 has a half-life of 703.8 million years.

Uranium-233 was investigated for use in nuclear weapons and as a reactor fuel; however, it was never deployed in nuclear weapons or used commercially as a nuclear fuel.

It has been used successfully in experimental nuclear reactors and has been proposed for much wider use as a nuclear fuel. Uranium-233 is produced by the neutron irradiation of thorium-232.

When thorium-232 absorbs a neutron, it becomes thorium-233, which has a half-life of only 22 minutes.

Thorium-233 decays into protactinium-233 through beta decay.This is because U-234 is not fissile, and tends to absorb slow neutrons in a nuclear reactor—becoming U-235.U-234 has a neutron capture cross-section of about 100 barns for thermal neutrons, and about 700 barns for its resonance integral—the average over neutrons having various intermediate energies.The isotope uranium-238 is also important because it absorbs neutrons to produce a radioactive isotope that subsequently decays to the isotope plutonium-239, which also is fissile.Uranium-233 is a fissile isotope of uranium that is bred from thorium-232 as part of the thorium fuel cycle.Uranium-233 is made from thorium-232 by neutron bombardment.