Comprehensive Study of Radon Progeny Attachment to Surfaces

Abstract

Low energy, low rate experiments, such as searches for neutrinoless double beta decay and dark matter, require unprecedentedly low levels of background in order to deliver their full science potential. ${}^{210}$Po driven, neutron induced background, caused by nuclear $(\alpha ,n)$-reactions on low-Z materials, direct background contributions of the ${}^{210}$Po $\alpha$-radiation and desorption of the ${}^{210}$Pb progeny ${}^{210}$Bi from surfaces into the detector medium are of particular of concern. These backgrounds depend on details of the components' exposure to radon-loaded lab air and, thus, their handling history. The attachment rates of airborne radon progeny to surfaces, needed for the estimation of these background rates, are poorly understood. This article reports the results of a campaign comprising of more than 1200 attachment measurements, performed for 9 different materials. Correlations of the attachment with environmental parameters such as air exchange rate, electrical surface potential, temperature, atmospheric pressure, and relative humidity have been studied and found to be significant only in case of the first two. Attachment modelling, using the Jacobi model, is compared to data.

References in corpus (9)

• Neutrino Physics with JUNO
• DarkSide-20k: A 20 Tonne Two-Phase LAr TPC for Direct Dark Matter Detection at LNGS
• DARWIN: towards the ultimate dark matter detector
• NEXO: Neutrinoless double beta decay search beyond $10^{28}$ year half-life sensitivity
• 7Be Solar Neutrino Measurement with KamLAND
• Neutron production induced by $\alpha$-decay with Geant4
• A Radon Progeny Deposition Model
• Radon Daughter Plate-out Measurements at SNOLAB for Polyethylene and Copper
• Radon Daughter Plate-out onto Teflon

Cited by in corpus (1)

• Removal of radon progeny from delicate surfaces