Function: noun
Date: 1903
: a photon emitted spontaneously by a radioactive substance also : a photon of higher energy than that of an X ray ― usually used in plural
Function: noun
Date: 1903
: a photon emitted spontaneously by a radioactive substance also : a photon of higher energy than that of an X ray ― usually used in plural
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012