Back Isotoopverhouding Afrikaans نسبة النظائر Arabic Isotopenverhältnis German Isótopo trazador Spanish امضای ایزوتوپی Persian Composition isotopique French Jejak isotopik ID Deltawaarde Dutch Assinatura isotópica Portuguese Изотопная подпись Russian
An isotopic signature (also isotopic fingerprint) is a ratio of non-radiogenic 'stable isotopes', stable radiogenic isotopes, or unstable radioactive isotopes of particular elements in an investigated material. The ratios of isotopes in a sample material are measured by isotope-ratio mass spectrometry against an isotopic reference material. This process is called isotope analysis.