tritium

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tritium

 [trit´e-um, trish´e-um]
the mass 3 isotope of hydrogen, symbol 3H, with a half-life of 12.26 years and used as an indicator or tracer in metabolic studies.

hy·dro·gen 3

(3H) (hī'drō-jen)
A hydrogen isotope of atomic weight 3; weakly radioactive, emitting beta particles to become the stable helium-3; half-life, 12.32 years.
Synonym(s): tritium.

tritium

a radioactive isotope of hydrogen with an atomic mass of three (H3).