decay time
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.
Compare
e (symbol)
(def 1).
Also called
mean life
.
Examples from the web for
decay time
The free-carrier
decay time
is frequently, if not almost always, nonexponential and is injection-level dependent.