Tritium is produced naturally by interaction of cosmic rays with nitrogen and oxygen mainly in the upper atmosphere, and, after oxidation to HTO, takes part in the hydrological cycle.
Shortly after the discovery of natural tritium in the environment (von Faltings and Harteck, 1950; Grosse et al., 1951), the potential of tritium as a tracer of water movement in natural water systems, including the ocean was recognized (e.g.
The concentrations of atmospheric noble gases in the groundwater were used to calculate the excess air component and the water temperature at recharge.
Martin Stute, Professor of Environmental Science, began teaching at Barnard in 1993 and became a full-time faculty member in 1995.
He serves as Co-Chair of Barnard's Department of Environmental Science.
Generally, the contribution of the mantle He is greater than the radiogenic, because the mantle He has 1.05-1.25×10-5 for the ratio of 3He/4He and 1-10×10-9 is for the radiogenic 3He/4He ratio. The recharged zone is located at a high mountain area with an altitude of more than 1800 m, formed by the Median Tectonic Line as an active fault, rising at the back of Saijo Basin as like a wall. We estimated groundwater residence time by 3H 3He, which were the conventional methods and the proposed method that takes into consideration of accumulation effect from the mantle 3He.
We collected 10 groundwater samples at the Saijo Basin.