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half-life (US DoD Definition)


Definition of the term 'half-life ' per official documentation of the United States Department of Defense.

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half-life



(*) The time required for the activity of a given radioactive species to decrease to half of its initial value due to radioactive decay. The half-life is a characteristic property of each radioactive species and is independent of its amount or condition. The effective half-life of a given isotope is the time in which the quantity in the body will decrease to half as a result of both radioactive decay and biological elimination. (US DoD)
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