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dc.contributor.authorBonatt, Joshua
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date.accessioned2017-07-07T19:22:01Z
dc.date.available2017-07-07T19:22:01Z
dc.identifier.urihttp://hdl.handle.net/1974/15940
dc.description.abstractThe DEAP-3600 experiment is a single-phase liquid argon dark matter detector employing pulse discrimination to mitigate background-like events and isolate WIMP-like events. The vessel that holds 3600~kg of target, and the flowguide that guides convective flow, are made of ultrapure acrylic plastic. Diffusion of radioactive radon and radon progeny within air into the acrylic post-fabrication result in a surface layer that is orders of magnitude more radioactive than the bulk material. The robotic sanding of the vessel and the manual sanding of the flowguides, to reduce surface contamination to that of the bulk, are discussed: the Resurfacer removed 360 ± 30 μm of acrylic from the vessel surface as a rate of 10.5 ± 2.3 g/hr, and a minimum of 37 μm was manually removed from the argon-exposed flowguide surfaces. The empirical assay of acrylic bulk contamination is also discussed: a content of (2 ± 2) × 10^-19 grams of Pb-210 per gram of acrylic was measured, with a procedural Pb-210 recovery efficiency of 47 ± 13%.en_US
dc.language.isoenen_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
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.subjectDEAPen_US
dc.subjectLead-210en_US
dc.subjectRadon-222en_US
dc.subjectAcrylicen_US
dc.subjectResurfaceren_US
dc.titleRadioreduction and Radiopurity of Acrylic in the DEAP-3600 Dark Matter Experimenten_US
dc.typethesisen_US
dc.description.degreeMaster of Scienceen_US
dc.contributor.supervisorBoulay, Mark Guyen
dc.contributor.departmentPhysics, Engineering Physics and Astronomyen


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