Tritium

A radioisotope of hydrogen with two neutrons and one proton in its nucleus. It is radioactive to beta decay with a half life of 12.5 years. In a nuclear fusion device, lithium is important as a source of tritium and serves as a booster for the fusion reaction in the secondary component of a nuclear weapon.

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Mass number	3		Clip
Atomic / Molecular Weight	3.016049	gmol-1	Clip

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See also: Deuterium, Hydrogen, Lithium, Triton.