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decay time

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noun Physics.
  1. 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018