Online ^222 Rn removal by cryogenic distillation in the XENON100 experiment

European Physical Journal C(2017)

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摘要
We describe the purification of xenon from traces of the radioactive noble gas radon using a cryogenic distillation column. The distillation column was integrated into the gas purification loop of the XENON100 detector for online radon removal. This enabled us to significantly reduce the constant ^222 Rn background originating from radon emanation. After inserting an auxiliary ^222 Rn emanation source in the gas loop, we determined a radon reduction factor of R > 27 (95
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