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In a nuclear reactor, such a chain reaction is slowed and controlled by a neutron poison, absorbing some of the free neutrons.
Such neutron absorbent materials are often part of reactor control rods (see nuclear reactor physics for a description of this process of reactor control).
Uranium glass fluoresces green in ultraviolet light.
It was also used for tinting and shading in early photography.
Uranium-235 was the first isotope that was found to be fissile.
Other naturally occurring isotopes are fissionable, but not fissile.
Research by Otto Hahn, Lise Meitner, Enrico Fermi and others, such as J.
However, because of the tiny amounts found in nature, uranium needs to undergo enrichment so that enough uranium-235 is present.
At high impact speed, the density, hardness, and pyrophoricity of the projectile enable the destruction of heavily armored targets.
Tank armor and other removable vehicle armor can also be hardened with depleted uranium plates.
When refined, uranium is a silvery white, weakly radioactive metal.
It has a Mohs hardness of 6, sufficient to scratch glass and approximately equal to that of titanium, rhodium, manganese and niobium.