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Mean annual (222)Rn concentration in homes located in different geological regions of Poland: first approach to whole country area |
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| Authors: | Przylibski Tadeusz A Zebrowski Adam Karpińska Maria Kapa?a Jacek Kozak Krzysztof Mazur Jadwiga Grz?dziel Dominik Mamont-Cie?la Kalina Stawarz Olga Koz?owska Beata K?os Barbara Dorda Jerzy Wysocka Ma?gorzata Olszewski Jerzy Dohojda Marek |
| Institution: | a Wroc?aw University of Technology, Faculty of Geoengineering, Mining and Geology, Institute of Mining, Division of Geology and Mineral Waters, Wybrze?e S. Wyspiańskiego 27, 50-370 Wroc?aw, Poland b Wroc?aw University of Technology, Wybrze?e S. Wyspiańskiego 27, 50-370 Wroc?aw, Poland c Medical University of Bia?ystok, Department of Biophysics, ul. Mickiewicza 2A, 15-089 Bia?ystok, Poland d The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Science, Laboratory of Radiometric Expertise, ul. W. E. Radzikowskiego 152, 31-342 Kraków, Poland e Central Laboratory for Radiological Protection, ul. Konwaliowa 7, 03-194 Warsaw, Poland f University of Silesia, Institute of Physics, Department of Nuclear Physics and Its Applications, ul. Uniwersytecka 4, 40-007 Katowice, Poland g Central Mining Institute, Department of Technical Acoustics, Laser Technique and Radiometry, Laboratory of Radiometry, Plac Gwarków 1, 40-166 Katowice, Poland h The Nofer Institute of Occupational Medicine, Radiation Protection Department, ul. ?w. Teresy 8, 91-348 ?ód?, Poland i Building Research Institute, Department of Structures and Building Elements, ul. Filtrowa 1, 00-611 Warsaw, Poland |
| Abstract: | The paper presents the results of year-long measurements of radon (222Rn) concentration inside 129 buildings in Poland in relation to the geological conditions of their foundation. The authors took into account the division of the country into tectonic units, as well as the lithology of the rocks forming the bedrock of these buildings. As expected, the highest value of mean annual 222Rn concentration (845 Bq/m3) was recorded in a building situated in the area of the Sudetes, while the highest geometric mean (characteristic of the expected log-normal data distribution) was calculated based on measurements from buildings located within the East-European craton, in the area of Mazury-Podlasie monocline, where it reached 231 Bq/m3. Such results reflect geological conditions - the occurrence of crystalline rocks (especially U- and Ra-enriched granites and orthogneisses) on the surface in the Sudetes, and of young post-glacial sediments containing fragments of Scandinavian crystalline rocks, also enriched with U and Ra, in the area of Mazury-Podlasie monocline. However, the least expected result of the investigations was finding out that, contrary to the hitherto widespread belief, none of the major tectonic units of Poland can be excluded from the list of those containing buildings with mean annual 222Rn concentration exceeding 200 Bq/m3. The mean annual concentration of radon for all the buildings were much higher than the mean concentration value (49.1 Bq/m3) of indoor radon in Poland quoted so far. These results cast a completely new light on the necessity to perform measurements of radon concentration in residential buildings in Poland, no more with reference to small areas with outcrops of crystalline rocks (especially the Sudetes, being the Polish fragment of the European Variscan belt), but for all the major tectonic units within Poland. |
| Keywords: | Radon Building West-European platform East-European craton The Carpathians The Sudetes |
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