Math Easy Solutions, tritium’s “radioactivity” just means tritium atoms are unstable and spontaneously decay over time, releasing low-energy beta radiation as they turn into helium-3; tritium’s physical half-life is about 12.3 years, so half of any sample decays in that time CNSC Wikipedia.

That does not mean it’s some magic glowing death juice — its beta particles are weak and can’t travel far, so the bigger concern is if tritium gets inside the body through water, air, or food, where it can cause internal exposure CNSC radioactivity.eu.com.

On InLeo, the only relevant hit was a discussion of radioactive fallout more broadly, not a clean explainer of tritium itself thread.