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Low-background liquid xenon detectors are utilized in the investigation ofrare events, including dark matter and neutrinoless double beta decay. Fortheir calibration, gaseous $^{220}$Rn can be used. After being introduced intothe xenon, its progeny isotope $^{212}$Pb induces homogeneously distributed,low-energy ($<30$ keV) electronic recoil interactions. We report on thecharacterization of such a source for use in the XENONnT experiment. Itconsists of four commercially available $^{228}$Th sources with an activity of55 kBq. These sources provide a high $^{220}$Rn emanation rate of about 8 kBq.We find no indication for the release of the long-lived $^{228}$Th above 1.7mBq. Though an unexpected $^{222}$Rn emanation rate of about 3.6 mBq isobserved, this source is still in line with the requirements for the XENONnTexperiment.

Characterization of a $^{220}$Rn source for low-energy electronic recoil calibration of the XENONnT detector