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Bruenner, S.; Cichon, D.; Eurin, G.; Gómez, P. Herrero; Jörg, F.; Undagoitia, T. Marrodán; Simgen, H.; Rupp, N.
The European physical journal. C, Particles and fields, 04/2021, Letnik: 81, Številka: 4Journal Article
Long-lived radon daughters are a critical background source in experiments searching for low-energy rare events. Originating from radon in ambient air, radioactive polonium, bismuth and lead isotopes plate-out on materials that are later employed in the experiment. In this paper, we examine cleaning procedures for their capability to remove radon daughters from PTFE surfaces, a material often used in liquid xenon TPCs. We find a large difference between the removal efficiency obtained for the decay chains of 222 Rn and 220 Rn. This indicates that the plate-out mechanism has an effect on the cleaning success. While the long-lived 222 Rn daughters can be reduced by a factor of 2, the removal of 220 Rn daughters is up to 10 times more efficient depending on the treatment. Furthermore, the impact of a nitric acid based PTFE cleaning on the liquid xenon purity is investigated in a small-scale liquid xenon TPC.
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in: SICRIS
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