[__rvx86]

Tritium is itself short-lived, much like radon; once you contain the release, that which has been released decays quickly to harmless levels.

[stboz]

...once you contain the release, that which has been released decays quickly to harmless levels.

Half-life is 12.3 years. That's quick relative to U-238 but long enough to be a problem in a large and uncontained release.

[TexasGator]

“Tritium is itself short-lived,”

12.32 year half-life.