Abstract
The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose underground experiment with primary physics goal the neutrino mass hierarchy determination. For the sake of suppressing the radioactivity from the surrounding rocks and tagging the cosmic muons, the central detector is surrounded by a water Cherenkov detector. Therefore, the strict requirements are put forward for intrinsic radioactivity in water, i.e., the radon concentration should be less than 0.2 Bq/m3. In order to monitor the radon concentration in water, a high sensitivity detector has been developed. The degassing membrane device and the micro-bubble generator were installed in the JUNO prototype water system to study the radon removal in water.
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