time required for the activity of a radionuclide to decrease to half of its initial value
Note 1 to entry: The radioactive half-life is related to the decay constant λ by the expression: T˝= ln2/λ ≈ 0,693/λ. This quantity is expressed in seconds (s). Note 2 to entry: This entry was numbered 393-14-19 in IEC 60050-393:2003.
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