A new low-level γ-ray spectrometry system for environmental radioactivity at the underground laboratory Felsenkeller |
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| Institution: | 1. Verein für Kernverfahrenstechnik und Analytik Rossendorf e.V. (VKTA), P.O. Box 510119, D-01314 Dresden, Germany;2. Laboratori Nazionali del Gran Sasso, INFN, S.S. 17/bis km 18+910, I-67010 Assergi (AQ), Italy;3. CANBERRA France, 1, chemin de la Roseraie, B.P. 311, F-67834 Tanneries Cedex, France;4. European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (EC-JRC-IRMM), Retieseweg 111, B-2440 Geel, Belgium;5. Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany;6. LSCE/Vallée, Centre des Faibles Radioactivités, Domaine du CNRS, Avenue de la Terrasse, F-91198 Gif-sur-Yvette Cedex, France;1. AWE, Aldermaston, Reading, Berkshire, RG7 4PR, UK;2. University of Surrey, Guildford, GU2 7XH, UK;1. Laboratorio Subterráneo de Canfranc, Paseo de los Ayerbe S/N 22880 Canfranc Estación, Huesca, Spain;2. Laboratorio de Bajas Actividades (LABAC), Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain;1. IPHC, UPL, CNRS/IN2P3, F-67037 Strasbourg, France;2. LAL, Univ Paris-Sud, CNRS/IN2P3, F-91405 Orsay, France;3. ITEP, Institute of Theoretical and Experimental Physics, 117218 Moscow, Russia;4. University College London, London WC1E 6BT, United Kingdom;5. University of Manchester, Manchester M13 9PL, United Kingdom;6. JINR, Joint Institute for Nuclear Research, 141980 Dubna, Russia;7. CPPM, Université de Marseille, CNRS/IN2P3, F-13288 Marseille, France;8. Idaho National Laboratory, Idaho Falls, ID 83415, USA;9. IEAP, Czech Technical University in Prague, CZ-12800 Prague, Czech Republic;10. CENBG, Université Bordeaux, CNRS/IN2P3, F-33175 Gradignan, France;11. LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, F-14050 Caen, France;12. National Radiation Protection Institute, CZ-14000 Prague, Czech Republic;13. LAPP, Université de Savoie, CNRS/IN2P3, F-74941 Annecy-le-Vieux, France;14. University of Texas at Austin, Austin, TX 78712, USA;15. Laboratoire Souterrain de Modane, CNRS/CEA, F-73500 Modane, France;p. University of Warwick, Coventry CV4 7AL, United Kingdom;q. Osaka University, 1-1 Machikaney arna Toyonaka, Osaka 560-0043, Japan;r. Saga University, Saga 840-8502, Japan;s. FMFI, Comenius University, SK-842 48 Bratislava, Slovakia;t. LSCE, CNRS, F-91190 Gif-sur-Yvette, France;u. Imperial College London, London SW7 2AZ, United Kingdom;v. Institut Universitaire de France, F-75005 Paris, France;w. Jyväskylä University, FIN-40351 Jyväskylä, Finland;x. MHC, South Hadley, MA 01075, USA;y. Institute for Nuclear Research, MSP 03680, Kyiv, Ukraine;z. Charles University in Prague, Faculty of Mathematics and Physics, CZ-12116 Prague, Czech Republic |
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| Abstract: | A low-level γ-ray spectrometry system, based on an HPGe-detector with 92% relative efficiency recently installed in the underground laboratory Felsenkeller at 110 m water equivalent (w.e.) depth, is described. The integral background count rate normalised to the Ge-crystal mass in the energy range from 40 keV until 2.7 MeV of 0.034 s−1 kg−1 has been achieved by careful material selection of the detector construction material, a graded shielding construction and effective radon suppression. The detector is highly suitable for the effective surveillance of water for human consumption with decision thresholds for 226Ra and 228Ra in the order of some mBq L−1. |
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