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The PandaX-4T distillation system, designed for the removal of krypton andradon from xenon, was evaluated for its radon removal efficiency using a$^{222}$Rn source during the online distillation process. The PandaX-4T darkmatter detector was employed to monitor the temporal evolution of radonactivity. To determine the radon reduction factor, the experimental data ofradon atoms introduced into and bypassed the distillation system was compared.The results indicate that, the PandaX-4T distillation system achieved a radonreduction factor exceeding 190 at a flow rate of 10 slpm and a reflux ratio of1.44. Gas-only online distillation process of a flow rate of 20 slpm was alsoconducted, without observing significant reduction of radon levels in thedetector. This observation suggests that the migration flow of radon atoms fromthe liquid phase to the gas phase is limited, and the flow rate and duration ofthe process may be insignificant compared to the total xenon mass of 6 tons.This study provides the evidence supporting the efficient removal of radonusing cryogenic distillation systems. Furthermore, it demonstrates that thedistillation method could control radon background levels effectively in liquidxenon-based experiments.

Radon Removal Commissioning of the PandaX-4T Cryogenic Distillation System