Assertion: tritium | /r/HasAspect | half-life of 12.5 years
Facets:
Source sentences:
text: Tritium is radioactive; it has a half-life of 12.5 years, decaying to a very soft (low energy) negative beta particle (electron; the positive beta particle is called a positron) and a helium-3 nucleus.
text: Tritium is radioactive and has a half-life of about 12.5 years.