Half-life, Radioactive
Half-life, Radioactive : The time required for half the atoms of a radioactive substance to disintegrate. During one half-life, the number of radioactive atoms in a material is reduced by one-half. Each radionuclide has a unique half-life. Tritium decays with a half-life of 12.3 years, and plutonium-239 decays with a half-life of about 24,000 years. The term half-life can also be used to describe the time required for the amount of a radionuclide or chemical in a biological compartment (e.g., vegetation, sediment, water, human or other animal tissue) to be reduced by one-half.
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