radioactive equilibrium

https://doi.org/10.1351/goldbook.R05084
Among the members of a @D01537@, the state which prevails when the ratios between the @A00114@ of successive members remain constant. (This is not an equilibrium in the strict sense since @R05083@ is an irreversible process).
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2519 [Terms] [Paper]