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Ar-40/Ar-39  search
BTisotopes
 .radioactive isotopes
 ..Ar-40/Ar-39
BTisotopes
 .stable isotopes
 ..Ar-40/Ar-39
BTnoble gases
 .argon
 ..Ar-40/Ar-39
UFAr-39/Ar-40
RTisotope ratios
 Ar-39
 Ar-40
SNThis term has multiple hierarchies.