ISOTOPIC COMPOSITION OF GROUNDWATER FROM MIXED URANIUM MILL TAILINGS IN SAXONY GERMANY/

Groundwaters in the area of a mixed landfill (domestic waste above ura nium mill tailings) in the Erzgebirge (Saxony, Germany) were investiga ted for their isotope signatures to distinguish between different grou ndwater types. The seepage water from the landfill shows higher delta( 34)S values as the inflow whereas the parameters tritium and delta(18) O do not significantly vary. Uranium values are lower than at other co mparable sites, The maximum of 0.7 mg/l U-nat was measured in the geol ogical underground of the landfill. Significant radium concentrations occur in the geological background and are due to former mining activi ties. The landfill does not produce increased radium values in the wat er.