摘要: The radioactive noble gas 222Rn, which can be dissolved in water, is an important background source for JUNO. In this paper, based on the water system of JUNO prototype, two kinds of high sensitivity radon detectors have been proposed and validated. The sensitivity of Si-PIN Rn detector, which uses Si-PIN photodiode to detect the -214Po, is 4.2 mBq/m3 and the sensitivity of LS Rn detector, which uses liquid scintillator to detect the coincident signals of -214Bi and -214Po, is 34.4 mBq/m3. Both of the two kinds of Rn detector have the potential to be developped into an online Rn concentration monitoring equipment for JUNO veto detector.
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