10-12 April 2013
INFN - Laboratori Nazionali del Gran Sasso
Europe/Rome timezone

Radiopurity measurement of acrylic for DEAP-3600

11 Apr 2013, 15:00
1h 20m
E. Fermi auditorium (INFN - Laboratori Nazionali del Gran Sasso)

E. Fermi auditorium

INFN - Laboratori Nazionali del Gran Sasso

SS 17 bis, km 18 + 910, 67100 Assergi (AQ), Italy
poster Cosmogenic activation and low background techniques in experiments Poster session

Speaker

Ms Corina Nantais (Queen's University)

Description

The spherical acrylic vessel that contains the liquid argon target is the most critical component in the DEAP-3600 dark matter experiment. Alpha decays near the inner surface of the acrylic vessel are one of the main sources of background in the detector. A fraction of the alpha energy, or the recoiling nucleus from the alpha decay, could misreconstruct in the fiducial volume and result in a false candidate dark matter event. Acrylic has some inherent contamination, including U-238 and Th-232. Another background of particular concern is diffusion of Rn-222 during manufacturing. The maximum acceptable concentrations in the DEAP-3600 acrylic vessel are ppt levels of U-238, Th-232, and 10^-8 ppt of Pb-210.The impurities in the bulk acrylic will be measured by vaporizing a large quantity of acrylic and counting the concentrated residue with an ultra-low background HPGe well detector and a low background alpha spectrometer. First results from the acrylic assay system at SNOLAB will be presented.

Primary author

Ms Corina Nantais (Queen's University)

Presentation Materials

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