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Ultra-low background measurements of decayed aerosol filters |
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| Authors: | Craig Aalseth Erica Andreotti Dirk Arnold Joan-Albert Sanchez Cabeza Detlev Degering Andrea Giuliani Raquel Gonzales de Orduña Rodolfo Gurriaran Mikael Hult Martin Keillor Matthias Laubenstein Gilbert le Petit Romul Mircea Margineanu Murray Matthews Harry Miley Iolanda Osvath Monica Pellicciari Wolfango Plastino Hardy Simgen Marc Weber Robert Werzi |
| Institution: | 1. Pacific Northwest National Laboratory (PNNL), MS P8-01, 902 Battelle Blvd, Richland, WA, 99352, USA 2. Dipartimento di Fisica e Matematica, Università dell’Insubria, via Valleggio 11, 22100, Como, Italy 3. Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany 4. IAEA Marine Environment Laboratory, 4 Quai Antoine 1er, 98000, Monaco, Monaco 5. Verein für Kernverfahrenstechnikund Analytik Rossendorf e.V., Postfach 510119, 01314, Dresden, Germany 6. EC-JRC Institute for Reference Materials and Measurements, Retieseweg 111, 2440, Geel, Belgium 7. IRSN/DEI/STEME/Environmental Radioactivity Measurement Laboratory, Bat. 501, Bois des Rames, 91400, Orsay, France 8. Laboratori Nazionali del Gran Sasso, S.S.17/bis km 18+910, 67010, Assergi, AQ, Italy 9. CEA/DAM Ile-de-France, Bruyères-le-Chatel, 91297, Arpajon Cedex, France 10. National Institute of Research and Development for Physics and Nuclear Engineering, PO Box MG-6, 077125, Magurele, Ilfov, Romania 11. Radioactivity Specialists Ltd, 108 Victoria Street, PO Box 25-099, Christchurch, New Zealand 12. Department of Physics, University of Roma Tre, Via della Vasca Navale, 84, 00146, Rome, Italy 13. National Institute of Nuclear Physics, Section of Roma Tre, Via della Vasca Navale, 84, 00146, Rome, Italy 14. Max-Planck-Institut für Kernphysik, PO Box 103980, 69029, Heidelberg, Germany 15. CTBTO/IMS Division, PO Box 1200, 1400, Vienna, Austria |
| Abstract: | Aerosol samples collected on filter media were analyzed using HPGe detectors employing varying background-reduction techniques in order to experimentally evaluate the opportunity to apply ultra-low background measurement methods to samples collected, for instance, by the Comprehensive Test Ban Treaty International Monitoring System (IMS). In this way, realistic estimates of the impact of low-background methodology on the sensitivity obtained in systems such as the IMS were assessed. The current detectability requirement of stations in the IMS is 30 μBq/m3 of air for 140Ba, which would imply ~106 fissions per daily sample. Importantly, this is for a fresh aerosol filter. One week of decay reduces the intrinsic background from radon daughters in the sample allowing much higher sensitivity measurement of relevant isotopes, including 131I. An experiment was conducted in which decayed filter samples were measured at a variety of underground locations using Ultra-Low Background (ULB) gamma spectroscopy technology. The impacts of the decay and ULB are discussed. |
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