摘要：Noble gas isotopes dissolved in groundwater providevaluable information about climatic conditionsduring recharge, as well as the residence time ofgroundwater and its renewal rate. The isotope compositionof noble gases can also serve as a geochemical fingerprintto decipher the origin of groundwater and its flow patterns.The Isotope Hydrology Laboratory (IHL) of the IAEA isfully equipped with the equipment required to measurewith high precision noble gas concentrations and stableisotopes of noble gases from groundwater samples (such as3He, 4He, 20Ar, 22Ar, etc.).
