Low-level gamma-spectrometry by using Compton suppression — testing the performance of two systems at the ANSTO low level radiochemistry laboratory

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dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorZawadzki, Aen_AU
dc.contributor.authorFierro, Den_AU
dc.date.accessioned2022-11-14T23:31:28Zen_AU
dc.date.available2022-11-14T23:31:28Zen_AU
dc.date.issued2008-11-25en_AU
dc.date.statistics2022-02-01en_AU
dc.description.abstractThe successful use of gamma-spectrometry to measure very low level radioactivity relies on several factors, including the actual system and shielding, as well as environmental factors. A low-level laboratory needs to be in a geographic location with low back ground radiation, built with low background materials. The laboratory should ideally be built underground to minimize the interference from cosmic radiation. Compton suppressed systems have been designed to reduce background caused by Compton scattering. The background can be reduced by the use of Compton Suppression. This is achieved by introducing a second detection system. This second detection system, consisting of a large single crystal Nal annulus, detects the escaping energy from partial absorbed photons in the primary detector, the High purity Germanium detector. As set of standards tests to check the performance of the Compton suppression systems has b n devised by the Monaco Laboratory ( J-F Commanducci, 2003). These tests have been carried out on both ANSTO systems and show a considerable improvement in Compton to peak ratios in the testing and an overall decrease in background due to the shipping of incomplete photon absorption in the primary detector. The two systems allow small environmental samples to be analysed for isotopes such as Pb-210, Cs-137 and Be-7, without compromising the detection limit too much. J-F Commanducci, 2003: Construction du Laboratoire Souterrain et des Spectrometres a coincindences “faibre bruit” destines a la surveillance de L’Environrnent Marin. IAEA-MEL Document. PP 69.en_AU
dc.identifier.citationHeijnis, H., Zawadzki, A, W., & Fierro, D. (2008). Low-level gamma-spectrometry by using Compton suppression — testing the performance of two systems at the ANSTO low level radiochemistry laboratory. Paper presented to SPERA 08, South Pacific Environmental Radioactivity Association Conference, University of Canterbury, Christchurch, New Zealand, 23-27 November 2008. (pp. 52).en_AU
dc.identifier.conferenceenddate27 November 2008en_AU
dc.identifier.conferencenameSPERA 08, South Pacific Environmental Radioactivity Association Conferenceen_AU
dc.identifier.conferenceplaceChristchurch, New Zealanden_AU
dc.identifier.conferencestartdate23 November 2008en_AU
dc.identifier.pagination52en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14039en_AU
dc.language.isoenen_AU
dc.publisherSouth Pacific Radioactivity Associationen_AU
dc.subjectSpectroscopyen_AU
dc.subjectGamma spectrometersen_AU
dc.subjectInhibitionen_AU
dc.subjectRadioactivityen_AU
dc.subjectShieldingen_AU
dc.subjectANSTOen_AU
dc.subjectTestingen_AU
dc.subjectGE semiconductor detectorsen_AU
dc.titleLow-level gamma-spectrometry by using Compton suppression — testing the performance of two systems at the ANSTO low level radiochemistry laboratoryen_AU
dc.typeConference Abstracten_AU
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