Accelerator mass spectrometry in hydrology

Jean-Charles Fontes, University de Paris-Sud

John N. Andrews, University of Reading

Nuclear Instruments and Methods B92 (1994) 367-375.

Applications of 14C, 36Cl and 129 I in hydrology using the AMS technique are reviewed. The small amounts of carbon needed for AMS measurement of 14C have facilitated new areas of hydrological research. Uncertainties in the natural fall-out of 36Cl and the dissolution of 36Cl-labelled chloride during groundwater migration are limitations for groundwater dating with this nuclide. Estimation of recharge by measurements of the advance of the 36Cl bomb peak through the unsaturated zone is of increasing importance in hydrology. AMS measurements of 129 I will provide an environmental monitor for nuclear pollution plumes. Some directions for future studies are suggested.