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The Collaborative International Dictionary of English v.0.48 (gcide)

tritium \trit"i*um\ (tr[i^]t"[i^]*[u^]m), n. (Chem.)
A radioactive isotope of hydrogen having one proton and two
neutrons in the nucleus. It decays spontaneously to Helium-3
by the emission of an electron (beta ray), with a half-life
of 12.3 years. Symbol 1H3. Atomic weight 3.01605 (C-12 =
12.0000). It is one of the radioisotopes commonly used to
label chemical compounds for use as tracers in biochemistry
and chemistry. It is also used as one of the fusionable
components of a hydrogen bomb.
[PJC]

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