Abstract
Large amounts of mining waters are discharged into waterstreams in the region of Ostrava-Karviná Mining District. This paper deals with discharged mine water from the Žofie watershaft , which is located in Petrvald basin in Czech part of Upper Silesian coal basin. Mine water may affect surface watercourses, especially their sediments, which may have increased activity of radium 226Ra. The aim of this work was to evaluate geochemical evolution of the Rychvald creek with regard to the mobility of radium 226Ra and estimate the degree of influence. From the results, it is evident that the mine waters significantly affect the composition of Rychvald creek. Increased equivalent dose was measured only up to the wastewater treatment plant, which probably considerably diluted the water, consequently diminishing migration abilities of radium. From the result of physicochemical parameters it is evident that discharged mine water from the Žofie watershaft affects mainly conductivity, due to high mineralization of discharged mine water. Increased doses of the gamma radiation equivalent, which are related to the increased mass activity of radium 226Ra, were found in the sediment of the first 1 200 m of the Rychvaldské creek. However the determined increased activities of radium 226Ra do not represent neither substantial risk for human health nor important risk for the environment.
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