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The 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. / Thesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2014-01-14 19:27:47.533

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2008. / Includes bibliographical references (leaves 128-152). Also available in electronic version.

Thesis (Ph. D.)--University of Chicago, 1918. / "Private edition, distributed by the University of Chicago libraries." "References": p. 13. Also available on the Internet.

Thesis (Ph.D.) - University of St Andrews, May 2007. / Restricted until 3rd May 2012.

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 165-177). Also available via the Internet.

Thesis (Ph.D.)--Texas Christian University, 2009. / Title from dissertation title page (viewed Oct. 30, 2009). Includes abstract. Includes bibliographical references.

Thesis (Ph. D.)--University of Chicago, 1918. / "Private edition, distributed by the University of Chicago libraries." eContent provider-neutral record in process. Description based on print version record. "References": p. 13.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1965. / Typescript. Abstracted in Dissertation abstracts, v. 25 (1965) no. 10, p. 5575-76. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliography.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1966. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.