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Calibration of commercial radon and thoron monitors at stable activtiy concentrations
Institution:1. European Commission, Joint Research Centre, Radionuclide Metrology Sector, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel, BELGIUM;2. ENEA, National Institue Ionizing Radiation Metrology, C.R. Casaccia, Via Anguillarese, 301, 00123 S. Maria di Galeria, Rome, ITALY;3. Federal Office of Metrology and Surveying, Ionising Radiation and Radioactivity, Arltgasse 35, 1160, Vienna, AUSTRIA;1. Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, Zagreb 10000, Croatia;2. Faculty of Textile Technology, University of Zagreb, Prilaz baruna Filipovića 28a, Zagreb 10000, Croatia;3. Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb 10000, Croatia;1. Kyoto University, Kyoto 606-8501, Japan;2. Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan;3. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8567, Japan;4. Research Institute for Humanity and Nature, Kyoto 603-8047, Japan;5. Saijo Municipal Office, Saijo 793-8601, Japan;6. Research Reactor Institute, Kyoto University, Kumatori 590-0494, Japan;7. Department of Environmental Systems, School of Frontier Sciences, University of Tokyo, Kashiwa 277-8563, Japan;1. Unité de recherche de Nanomatériaux et Environnement (UR15ES01), IPEIT, Université de Tunis, 2 Rue Jawaher Lel Nahru, 1089 Montfleury, Tunisia;2. Faculté des Sciences de Tunis, Université Tunis El Manar, 2092 El Manar, Tunis, Tunisia;1. School of Nuclear Science and Engineering, North China Electric Power University, Beijing, 102206, China;2. Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Beijing, 100084, China;3. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China
Abstract:The upcoming revision of Council Directive 96/29/Euratom in the form of the proposed basic safety standards for protection against the dangers arising from exposure to ionizing radiation (BSS) evokes new challenges for the metrology institutes. In the case of the two radon isotopes, the corresponding public exposure will be part of legal metrology for the first time. Since the levels of activity concentration that are laid down in the draft of the BSS cover the range from 200 Bq/m3 to 300 Bq/m3 in general (with an exceptional top level of 1000 Bq/m3), new calibration procedures for existing commercial monitors with their limited counting statistic have to be developed. This paper gives an overview how this metrological challenge can be overcome.
Keywords:Radon  Thoron  Emanation  Calibration  Reference atmospheres  Metrology
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