Tritiated water

Tritiated water, also known as tritium oxide (chemical formula \( \text{H}_2^{3}\text{O} \) or \( \text{T}_2\text{O} \)), is water in which the hydrogen atoms are replaced with tritium, a radioactive isotope of hydrogen. Tritium is a beta-emitting isotope with a half-life of about 12.3 years.