The 15N:14N ratio is commonly used in stable isotope analysis in the fields of geochemistry, hydrology, paleoclimatology and paleoceanography, where it is called δ15N.
Rasio 15N:14N umum digunakan dalam analisis isotop stabil di bidang geokimia, hidrologi, paleoklimatologi dan paleoseanografi, yang disebut δ15N.