High radon concentration in work and living places are caused by a high geological radon potentialof the soil , by technological processes, the use of building materials with high uranium, thoriumand radium content and the building construction. Further the influence of the working and living conditions on the dose estimation is very important. Especially the equilibrium factor and the unattached fraction are influenced by the working and living conditions.
After more than 35 years operation the uranium mining and milling facilities near Pécs city in Hungary were finally shut down in 1997. One of the most important and most complicated tasks is the remediation of tailings ponds because of the complexity of c
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