Uranium isotopes as a tracer of groundwater transport studies

The activity concentrations of (234)U and (238)U in thermal groundwater, deep well water and river water samples from Central Poland were determined. Concentration of (234)U and (238)U in the examined waters varied from <0.013 (LLD) to 16.8 mBq/dm(3) and from <0.013 (LLD) to 45.5 mBq/dm(3) respectively. The highest uranium activity concentrations were measured in the thermal groundwater from Mszczonow and Cieplice, while the lowest were observed in thermal ground water from Uniejow and Poddebice. In thermal groundwater from Skierniewice, uranium activity concentrations were below lower limit of detection (0.013 mBq/dm(3)). The (234)U/(238)U activity ratio varied from 0.37 (Cieplice) to 1.30 (Poddebice well water).