Abstract
The Jiangmen Underground Neutrino Observatory (JUNO), a 20-kton multipurpose underground liquid scintillator detector, was proposed with the determination of the neutrino mass hierarchy as a primary physics goal. To veto the cosmogenic background and shield the central detector from the environmental radioactivity, a multi-veto system, which consists of a water Cherenkov detector and a top tracker detector, is required. In order to keep the water quality good and remove the radon from water, an ultrapure water system, a radon removal system and radon concentration measurement system have been designed.
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