Definition: | for a radionuclide, time elapsed when the number of atoms or atomic nuclei in the considered state has decreased by a factor 1/e from its initial value
Note 1 to entry: For a radionuclide the radioactive mean life is the reciprocal of the decay constant λ, (τ = 1/ λ). Note 2 to entry: This entry was numbered 393-14-20 in IEC 60050-393:2003.
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