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The BetaCage, an ultra-sensitive screener for surface contamination

Bunker, R. and Ahmed, Z. and Bowles, M. A. and Golwala, S. R. and Grant, D. R. and Kos, M. and Nelson, R. H. and Schnee, R. W. and Rider, A. and Wang, B. and Zahn, A. (2013) The BetaCage, an ultra-sensitive screener for surface contamination. In: Low Radioactivity Techniques 2013 (LRT 2013). AIP Conference Proceedings. No.1549. American Institute of Physics , Melville, NY, pp. 132-135. ISBN 978-0-7354-1188-3.

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Material screening for identifying low-energy electron emitters and alpha-decaying isotopes is now a prerequisite for rare-event searches (e.g., dark-matter direct detection and neutrinoless double-beta decay) for which surface radiocon-tamination has become an increasingly important background. The BetaCage, a gaseous neon time-projection chamber, is a proposed ultra-sensitive (and nondestructive) screener for alpha-and beta-emitting surface contaminants to which existing screening facilities are insufficiently sensitive. Sensitivity goals are 0.1 betas keV^(−1) m^(−2) day^(−1) and 0.1 alphas m^(−2) day^(−1), with the former limited by Compton scattering of photons in the screening samples and (thanks to tracking) the latter expected to be signal-limited; radioassays and simulations indicate backgrounds from detector materials and radon daughters should be subdominant. We report on details of the background simulations and detector design that provide the discrimination, shielding, and radiopurity necessary to reach our sensitivity goals for a chamber with a 95 × 95 cm^2 sample area positioned below a 40 cm drift region and monitored by crisscrossed anode and cathode planes consisting of 151 wires each.

Item Type:Book Section
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URLURL TypeDescription Paper
Golwala, S. R.0000-0002-1098-7174
Additional Information:© 2013 AIP Publishing. Published online 08 August 2013. This work was supported in part by the National Science Foundation (Grants No. PHY-0855525 and PHY-0919278) and the Department of Energy HEP division.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:radiopurity screening, beta decay, alpha decay, dark matter, proportional counter, radon mitigation
Series Name:AIP Conference Proceedings
Issue or Number:1549
Classification Code:PACS: 29.30.Ep, 29.40.Cs, 29.40.Gx, 23.60.+e, 23.40.-s, 95.35.+d, 91.80.Hj, 92.20.Td
Record Number:CaltechAUTHORS:20160419-135528020
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Official Citation:The BetaCage, an ultra-sensitive screener for surface contamination R. Bunker, Z. Ahmed, M. A. Bowles, S. R. Golwala, D. R. Grant, M. Kos, R. H. Nelson, R. W. Schnee, A. Rider, B. Wang and A. Zahn Source: AIP Conf. Proc. 1549, 132 (2013);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66282
Deposited By: Ruth Sustaita
Deposited On:19 Apr 2016 23:35
Last Modified:10 Nov 2021 23:55

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