Helium Isotopes in Geothermal Waters from Northwest Hungary: Chapter 20

3He/4He ratios and helium concentrations have been measured for 15 thermal waters from northwest Hungary. All show a large enrichment in helium, relative to equilibrium solubility at recharge. The 3He/4He ratios (0.22 > R/Ra < 1.07) show an appreciable component of mantle-derived helium in all samples.