average life

in nuclear chemistry
Defined for an @[email protected] or nuclear system in a specified state. For an exponentially decaying system, it is the average time for the number of atoms or @[email protected] in a specified state to decrease by a factor e. Synonymous with @[email protected]
PAC, 1982, 54, 1533. (Glossary of terms used in nuclear analytical chemistry (Provisional)) on page 1536 [Terms] [Paper]