Online $^{222}$Rn removal by cryogenic distillation in the XENON100 experiment
Abstract: We describe the purification of xenon from traces of the radioactive noble gas radon using a cryogenic distillation column. The distillation column is 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% C.L.) for the distillation column by monitoring the ${222}$Rn activity concentration inside the XENON100 detector.
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