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.

Nearby words

  1. decay,
  2. decay chain,
  3. decay constant,
  4. decay series,
  5. decay theory,
  6. decca,
  7. deccan,
  8. deccan hemp,
  9. decd,
  10. decd.

Also called mean life. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019