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[en] An evaluation is made of the effects of nuclear power plants in the FRG, Austria and Slovakia on the current radiological state of the waters of the Danube river. Contents of ⁶⁰Co, ¹³⁷Cs and certain other radionuclides were found in comparative measurements carried out in the respective countries; the effects of the radioactivity of the Danube waters were studied on the quality of the ground water of the Rye Island (Zitny ostrov) which is the source of drinking water for the city of Bratislava; the results of monitoring the waters, fauna and flora of the river are given. In the radiological analysis of the Danube river waters the total alpha and beta activity and the content of tritium, ⁹⁰Sr, ¹³⁷Cs, ²²⁶Ra and uranium were determined. In the analysis of biological material the total alpha and beta activity and the content of radio-potassium were determined. The method of large-scale separation of radionuclides is described. Current analyses of the radioactivity of the Danube river waters have shown that along the banks of the water course considerable changes occur namely in the accumulation of radionuclides in water substrates, especially owing to hydrological, hydroecological and geochemical processes characteristic of the water course. These aspects should be investigated, namely with regard to the future use of the Danube waters and the control of the discharge of radioactive waste waters into the river. This is important because all Danube states have sited or are planning to site their nuclear power plants in the river basin. Also very important is the synergic effect of other chemical and biological pollutants which are extensively being discharged into the river from industrial and agricultural production. (B.S./J.O.)