A kind of quantitative analysis based on the isotope exchange between isotopes of the element to be determined and other isotopes of this element in different valency states or in different molecules.
Source:
PAC, 1994, 66, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2521 (https://doi.org/10.1351/pac199466122513)