München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Astroparticle Physics I

HK 23.6: Talk

Tuesday, March 19, 2019, 15:45–16:00, HS 18

Plate-out and removal of radon daughters from material surfaces — •Stefan Bruenner — Max-Planck-Institut für Kernphysik, Heidelberg

Surface contaminations with long lived Rn-222 daughters crucially contribute to the background in many rare event search experiments. In this talk we discuss different plate-out mechanisms of radon daughters on materials with a main focus on PTFE. Several cleaning procedures have been investigated by means of alpha-spectroscopy for their capability to remove Pb-210 and Po-210 from surfaces and the results will be presented. The goal of this study is to identify dedicated cleaning methods matched with the different materials and contaminations.