The results were presented at several international scientific conferences (5th Int. Symposium on the Natural Radiation Environment, Badgastein, 1991, 8th Int. Congress of I.R.P.A., Montreal, 1992, 2nd Int. Colloquium on Gas Geochemistry, Besancon, 1993, 6th Int. Symposium on the Natural Radiation Environment, Montreal, 1995, 9th Int. Congress of I.R.P.A., Wien, 1996, 4thInt. Colloquium on Gas Geochemistry, Roma, 1997, European Conference on Protection against Radon at Home and at Work, Prague, 1997, Int. Workshop on Radon in the Living Environment, Athens, 1999, 7th Int. Symposium on the Natural Radiation Environment, Rhodes, 2002, 7th Int. Conference on Gas Geochemistry, Freiberg, 2003, 4th European Conference on Protection against Radon at Home and at Work, Prague, 2004, International Workshop on Radon Data: Valorisation, Analysis and Mapping, Lausanne, 2005, 2nd European IRPA Congress on Radiation Protection, Paris, 2006, Conference Radon Risk – Time for More Effective Action, London, 2007, 5th Conference on Protection against Radon at Home and at Work, Prague, 2007, 33rd International Geological Congress, Oslo, 2008, International Radon Symposium - American Association of Radon Scientists and Technologists, Las Vegas NV, 2008, Radon Education Day, Illinois State University, 2008,  Radon/Thoron Measurement and Mitigation Workshop, Ottawa, 2008, Conference Radon in Environment, Zakopane, 2009, Radon Education Day, Ciudad Rodrigo, Spain, 2010. ).