Title: Ultra-Low Background Measurements of Decayed Aerosol Filters
Authors: AALSETH C.ANDREOTTI E.ARNOLD D.SANCHEZ CABEZA J.-A.DEGERING D.GIULIANI AndreaGONZALEZ DE ORDUNA RaquelGURRIARAN R.HULT MikaelKEILLOR M.LAUBENSTEIN M.LE PETIT G.MARGINEANU R. M.MATTHEWS M.MILEY H.OSVATH IolandePELLICCIARI M.PLASTINO W.SIMGEN H.WEBER M.WERZI R.
Citation: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY vol. 282 no. 3 p. 731-735
Publisher: SPRINGER
Publication Year: 2009
JRC N°: JRC55122
ISSN: 0236-5731
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC55122
DOI: 10.1007/s10967-009-0307-0
Type: Contributions to Conferences
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 lBq/m3 of air for 140Ba, which would imply approximately 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.
JRC Institute:Institute for Reference Materials and Measurements

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