Emilian Roşu

Ioan Seghedi

Institute of Geodynamics, Romanian Academy 19-21, Jean-Luis Calderon str., RO-020032 Bucharest, Romania

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Alexandru Szakács

Institute of Geodynamics, Romanian Academy 19-21, Jean-Luis Calderon str., RO-020032 Bucharest, Romania; Sapienţia University, Dept. of Environmental Sciences, Matei Corvin str., 4, RO-400112 Cluj-Napoca, Romania

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Emilian Roşu

Geological Institute of Romania, 1, Caransebeş str., RO-78344 Bucharest, 32, Romania

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Zoltán Pécskay

Institute of Nuclear Research of the Hungarian Academy of Sciences, P.O. Box 51, Bem ter 18/c, H-4001 Debrecen, Hungary

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Katalin Gméling

Nuclear Research Department, Institute of Isotopes, Chemical Research Centre, Hungarian Academy of Sciences, Budapest, Hungary