Hydrogen-3 (Tritium)[edit]
3H (atomic mass 3.016049281320(81) Da) is known as tritium and contains one proton and two neutrons in its nucleus. It is radioactive, decaying into helium-3 through β− decay with a half-life of 12.32(2) years.[12] Trace amounts of tritium occur naturally because of the interaction of cosmic rays with atmospheric gases. Tritium has also been released during nuclear weapons tests. It is used in thermonuclear fusion weapons, as a tracer in isotope geochemistry, and specialized in self-powered lightingdevices.
The most common method of producing tritium is by bombarding a natural isotope of lithium, lithium-6, with neutrons in a nuclear reactor.
Tritium was once used routinely in chemical and biological labeling experiments as a radiolabel. This has become less common, but still happens.[13] D-T nuclear fusionuses tritium as its main reactant, along with deuterium, liberating energy through the loss of mass when the two nuclei collide and fuse at high temperatures.
Reference from: https://en.wikipedia.org/wiki/Isotopes_of_hydrogen#Hydrogen-1_(Protium)
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