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dc.contributor.authorNantais, Corinaen
dc.date2014-01-14 19:27:47.533
dc.date.accessioned2014-01-16T18:12:57Z
dc.date.available2014-01-16T18:12:57Z
dc.date.issued2014-01-16
dc.identifier.urihttp://hdl.handle.net/1974/8554
dc.descriptionThesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2014-01-14 19:27:47.533en
dc.description.abstractThe liquid argon target of the DEAP-3600 dark matter detector is contained by an extremely radiopure acrylic vessel. Alpha decays from the inner surface of the acrylic vessel are a source of background. If a fraction of the alpha energy is observed, or if the recoiling nucleus from the alpha decay is observed, the event will not be separated from a dark matter candidate event. In addition to the low level of inherent contamination from uranium and thorium, the Pb-210 from Rn-222 diffusion during manufacturing must be measured. The limit for the DEAP-3600 acrylic vessel is 1.1 × 10^−20 g/g Pb-210. By vaporizing a large quantity of acrylic and counting the concentrated residue with an ultralow background HPGe well detector and a low background alpha spectrometer, the bulk acrylic was found to have an upper limit of 10^−19 g/g Pb-210. The design, installation, commissioning, operation, and analysis for various aspects of the acrylic assay are described.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectpoly(methyl methacrylate)en
dc.subjectPb-210en
dc.titleRadiopurity measurement of acrylic for the DEAP-3600 dark matter experimenten
dc.typethesisen
dc.description.degreeM.Sc.en
dc.contributor.supervisorBoulay, Mark Guyen
dc.contributor.departmentPhysics, Engineering Physics and Astronomyen
dc.degree.grantorQueen's University at Kingstonen


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