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Tritium (3H) is the most stable radioisotope of hydrogen. That is, of all radioactive isotopes of hydrogen, tritium is the least radioactive. It has a proton and 2 neutrons in its nucleus. Tritium decays through beta minus decay and changes to helium-3. It has a half-life of 12.32 years.
Best Answer: The definition of half life is the amount of time it takes for half the material to decay. It doesn't matter how much material you start with or the mode by which it decays. In 12 years, half of the hydrogen-3 atoms will become helium-3.