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We report measurements of radon daughters in liquid argon within theMicroBooNE time projection chamber (LArTPC). The presence of radon inMicroBooNE's 85 metric tons of active liquid argon bulk is probed with newlydeveloped charge-based low-energy reconstruction tools and analysis techniquesto detect correlated $^{214}$Bi-$^{214}$Po radioactive decays. Special datasetstaken during periods of active radon doping enable new demonstrations of thecalorimetric capabilities of single-phase neutrino LArTPCs for $\beta$ and$\alpha$ particles with electron-equivalent energies ranging from 0.1 to 3.0MeV. By applying $^{214}$Bi-$^{214}$Po detection algorithms to beam-externalphysics data recorded over a 46-day period, no statistically significantpresence of radon is detected, corresponding to a limit of $<0.38$ mBq/kg atthe 95\% confidence level. The obtained radon radiopurity limit -- the firstever reported for a noble element detector incorporating liquid-phasepurification -- is well below the target value of the future DUNE neutrinodetector.

Measurement of ambient radon daughter decay rates and energy spectra in liquid argon using the MicroBooNE detector