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Characterization and long-term performance of the Radon Trapping Facility operating at the Modane Underground Laboratory
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SYSNO ASEP 0517495 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Characterization and long-term performance of the Radon Trapping Facility operating at the Modane Underground Laboratory Author(s) Hodák, R. (CZ)
Perrot, F. (FR)
Brudanin, V. (RU)
Busto, J. (FR)
Havelcová, M. (CZ)
Hůlka, J. (CZ)
Jullian, S. (FR)
Kochetov, O. (RU)
Lalanne, D. (FR)
Loaiza, P. (FR)
Macl, J. (CZ)
Mamedov, F. (CZ)
Mizera, Jiří (UJF-V) RID, ORCID, SAI
Noel, R. (FR)
Piquemal, F. (FR)
Rukhadze, E. (CZ)
Rulík, P. (CZ)
Smolek, K. (CZ)
Soulé, B. (FR)
Suchá, T. (CZ)
Světlík, Ivo (UJF-V) RID, ORCID, SAI
Stekl, I. (CZ)
Warot, G. (FR)
Zampaolo, M. (FR)
Žaloudková, M. (CZ)Number of authors 25 Article number 115105 Source Title Journal of Physics G-Nuclear and Particle Physics. - : Institute of Physics Publishing - ISSN 0954-3899
Roč. 46, č. 11 (2019)Number of pages 17 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords radon ; charcoal ; spectrometry ; beta beta-decay Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders OECD category Nuclear physics Method of publishing Limited access Institutional support UJF-V - RVO:61389005 UT WOS 000488088100002 DOI 10.1088/1361-6471/ab368e Annotation Radon is one of the main potential sources of background radiation for any rare event experiments like neutrinoless double beta decay or dark matter experiments. The Radon Trapping Facility (RTF) installed in 2004 at the Modane Underground Laboratory (LSM) has been running for nine years providing radon-purified air at a level of 10 mBq m(-3) for several experiments. The radon suppression principle is based on a radon physical adsorption using cooled compressed air at -55 degrees C pumped through a column filled with the K48 activated charcoal. After disassembling of the RTF, the 2.6 m high charcoal column has been divided into several layers in order to study with different techniques the dynamic adsorption coefficient (the K-factor) as a function of the depth and the radon spatial trapping profile by measuring the Pb-210 activity. It has been demonstrated that after almost a decade of running, the K-factor of the activated charcoal remains constant except for the first few cm of the column. Furthermore, it has been demonstrated that the mass activity of Pb-210 as a function of the depth of the charcoal column exhibits an exponential decay profile. The radon mean retention time tau(R) of (47.6 +/- 1.2) days and the radon mean free path of (28.9 +/- 0.4) cm have been derived and found to be consistent at 1 sigma with the ones obtained from the K-factor study, i.e. from a total independent measurement. The radon suppression factor of the RTF of 6790(-1720)(+/- 2370) has been also estimated with a value consistent at 2 sigma with the suppression factor measured during the RTF operation. Thus, this study has proven the capacity of the RTF to purify the LSM air from radon by more than three orders of magnitude during nine years of operation. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2020 Electronic address https://doi.org/10.1088/1361-6471/ab368e
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