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Abstract

XENON1T is currently the most sensitive experiment for direct dark
matter search. In order to detect a dark matter particle scattering
off a xenon nucleus, the background has to be diminished. Thence,
the detector is surrounded by a water tank suppressing radiation and
cosmic rays. For the upgrade XENONnT, the sensitivity will be further improved by enriching the water with gadolinium. It will allow to
capture and detect neutrons created within the detector materials. In
order to check whether the trigger rate of the neutron veto system is
sufficiently low a radon background study is necessary. This work focuses on the development of a gas drying and purifying method which
supports the well established technique of radon measurements with
proportional counters. After introducing the radon measurement system at the MPIK, the performance of different gas drying techniques
will be analysed. Finally the extended measurement procedure is presented and characterized.