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The radioactive noble gas $^{222}$Rn, which can be dissolved in water, is animportant background source for JUNO. In this paper, based on the water systemof JUNO prototype, two kinds of high sensitivity radon detectors have beenproposed and developed. The sensitivity of Si-PIN Rn detector, which uses aSi-PIN photodiode to detect the $\alpha$ from $^{214}$Po decay, is$\sim$9.0~mBq/m$^3$. The sensitivity of LS Rn detector, which uses liquidscintillator to detect the coincident signals of $\beta$ from $^{214}$Bi decayand $\alpha$ from $^{214}$Po decay, is $\sim$64.0~mBq/m$^3$. Both of the twokinds of Rn detector have the potential to be developed as an online Rnconcentration monitoring equipment for JUNO veto detector.

The development of $^{222}$Rn detectors for JUNO prototype