isotope ratio

symbol: $R$
synonym: isotope–number ratio
https://doi.org/10.1351/goldbook.12452
Ratio of the number of atoms of one isotope to the number of atoms of another isotope of the same chemical element in the same system.
Note: Usually the minor, less abundant isotope to the major, most abundant isotope, for example, \(\ce{^{13}C}/\ce{^{12}C}\).
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1557 [Terms] [Paper]
Citation: 'isotope ratio' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.12452 RIS BibTex EndNote
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