The achievement, or the process of achieving, an equilibrium distribution of
isotopes within a specified set of atoms in a chemical species or group of chemical species
(for an example, see diagram).
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1132
See also:
PAC, 1991, 63, 1541
(Recommendations for nomenclature and symbolism for mass spectroscopy (including an
appendix of terms used in vacuum technology). (Recommendations 1991))
on page 1556