Hydrogen-3 3H
Hydrogen-3, or 3H, is a rare and highly unstable isotope of hydrogen. It is often referred to as "tritium" and is known for its radioactive properties. 3H has a half-life of 12.32 years, which means that after that time, half of its atoms will have decayed into helium-3. This decay process releases a small amount of energy in the form of gamma rays, making 3H a useful source of radiation for various applications, such as nuclear power generation and medical imaging.