Determination of alpha-emitting isotopes in radioactive wastes |
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Authors: | S Tölgyesi I Gresits T Past L Szabó G Volent T Pintér |
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Institution: | (1) Department of Chemical Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary;(2) Medical Faculty, First Department of Medicine, University of Pécs, H-7643 Pécs, Hungary;(3) Nuclear Power Plant Paks, P.O. Box 71, H-7031 Paks, Hungary |
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Abstract: | An analytical procedure was developed for the alpha-spectrometric determination of uranium (238U, 235U, 234U) and transuranium isotopes (239+240Pu, 244Cm) in liquid radioactive wastes (sludges, evaporation residues) of low and medium activity from the VVER-440 reactor of the nuclear power plant in Paks, and in waste waters to be released into the environment. Radioactive sludge samples were separated to a liquid phase and a wet suspension (solid) phase by centrifuging, and the two phases were treated and analyzed separately, in different ways. A sample preparation procedure based on chemical separation was worked out for the isolation of the alpha-emitting components of radioactive evaporation residues which were saturated with boric acid. To the separate determination of the low activity alpha-emitting isotopes appearing in waste waters to be released into the environment, a microvawe concentration technique was applied. The accuracy of the results obtained using the above chemical separation and alpha-spectrometry was tested in the framework of the international U. S. DOE EML Quality Assessment Program. |
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