Long-term environmental monitoring and application of low-level 3H, 7Be, 137Cs and 210Pb activity concentrations in the non-biotic compartments of the Danube in Austria

The aim, methods, and results of long-term low-level measurements of 3H, 7Be, 137Cs and 210Pb in water and sediment of the Austrian part of the Danube are presented. The results are discussed focused on recent and obvious future applications in applied radioecology and environmental research. The long-term radiometric data supported by the low-level monitoring program act as basis for ecological modelling and environmental assessment.