DEAP-3600 is a dark matter experiment using 3.6 tons of liquid argon to search for Weakly Interacting Massive Particles (WIMPs), with a target sensitivity to the spin-independent WIMP-nucleon cross-section of 10 -46 cm2. The detector is designed to allow for a three year background-free run with a 1-ton fiducial volume. We identify in this paper the potential sources of surface contamination. We require 238U and 232Th contaminations on the order of 10-12 g/g or less, a level achieved by the SNO experiment, and 210Pb not significantly out of equilibrium with 238U, i.e., 10-20 g/g or less 210Pb in the acrylic vessel or TPB wavelength shifter, which should be achievable with appropriate control of exposure to radon.

Additional Metadata
Keywords Backgrounds, Dark matter, Liquid argon, WIMP
Persistent URL dx.doi.org/10.1063/1.3579572
Conference Topical Workshop on Low Radioactivity Techniques, LRT 2010
Citation
Cai, B. (B.), Boulay, M.G, Cleveland, B. (B.), & Pollmann, T. (T.). (2011). Surface backgrounds in the DEAP-3600 dark matter experiment. In AIP Conference Proceedings (pp. 137–146). doi:10.1063/1.3579572