~(15)N isotopic pool dilution
~(233)U isotopic target
~(39)Ar~-~(40)Ar isotopic age
15N isotopic pool dilution
40Ar-39Ar isotopic age
40Ar-39Ar同位素年龄
~(40)Ar/~(39)Ar同位素年龄
absolute isotopic abundance
absolute isotopic abundance of samarium
acidolysis hydrocarbon isotopic compositions
Ar-~(39)Ar isotopic ages
argon isotopic composition
Argon isotopic fractionation
carbon and strontium isotopic effect
carbon isotopic chemostratigraphy
carbon isotopic composition
Carbon Isotopic Compositions