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decay time

noun, Physics.
the time required for a collection of atoms of a particular radionuclide to decay to a fraction of the initial number equal to 1/e, where e = 2.7182818 …, used as the base of natural logarithms.
Also called mean life. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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  • The free-carrier decay time is frequently, if not almost always, nonexponential and is injection-level dependent.

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