Tritium

Tritium is a radioactive isotope of hydrogen, meaning it is a variant of hydrogen with one proton and two neutrons instead of just one neutron. It occurs naturally in small amounts in the atmosphere but can also be produced in nuclear reactors. Tritium is used in various applications, including nuclear fusion research, self-luminous exit signs, and some types of nuclear batteries. Due to its radioactivity, tritium emits low-energy beta radiation, making it relatively safe in small amounts. However, it requires careful handling and storage to prevent contamination and exposure.