Michael Pöschl is associate professor of special animal husbandry in the Department of Radiobiology of Faculty of Agronomy at the Mendel University of Agriculture and Forestry (MUAF) in Brno, Czech Republic. His mean research interests are situated in the domain of radioecology, radio-spectrometry, and radiocontamination of foodstuffs. Dr. Pöschl is author or co-author of numerous scientific articles, abstracts, and presentations. He received the RNDr. (Degree of Doctor of Natural Sciences, Charles University in Prague, Czech Republic, 1976) and Ph.D. (1986) degrees in biology from the MUAF. Leo M. L. Nollet is a professor of biochemistry, aquatic ecology, and ecotoxicology in the Department of Engineering Sciences, Hogeschool Gent, Ghent, Belgium. His main research interests are in the areas of food analysis, chromatography, and analysis of environmental parameters. He is the author or coauthor of numerous articles, abstracts, and presentations, and is the editor of Handbook of Food Analysis , 2nd ed. (three volumes), Food Analysis by HPLC , 2nd ed., and Handbook of Water Analysis (all titles, Marcel Dekker, Inc.). He received his M.S. (1973) and Ph.D. (1978) degrees in biology from the Katholieke Universiteit Leuven, Leuven, Belgium.