Development of low-radon ultra-pure water for the Jiangmen Underground Neutrino Observatory
TY Guan, YP Zhang, B Wang, C Guo, JC Liu… - Nuclear Instruments and …, 2024 - Elsevier
TY Guan, YP Zhang, B Wang, C Guo, JC Liu, Q Tang, CG Yang, C Li
Nuclear Instruments and Methods in Physics Research Section A: Accelerators …, 2024•ElsevierAbstract The Jiangmen Underground Neutrino Observatory (JUNO) is a state-of-the-art
liquid scintillator-based neutrino physics experiment under construction in South China. To
reduce the background from external radioactivities, a water Cherenkov detector composed
of 35 kton ultra-pure water and 2,400 20-inch photomultiplier tubes is developed. Even after
specialized treatment, ultra-pure water still contains trace levels of radioactive elements that
can contribute to the detector background. Among which 222 Rn is particularly significant …
liquid scintillator-based neutrino physics experiment under construction in South China. To
reduce the background from external radioactivities, a water Cherenkov detector composed
of 35 kton ultra-pure water and 2,400 20-inch photomultiplier tubes is developed. Even after
specialized treatment, ultra-pure water still contains trace levels of radioactive elements that
can contribute to the detector background. Among which 222 Rn is particularly significant …
Abstract
Abstract The Jiangmen Underground Neutrino Observatory (JUNO) is a state-of-the-art liquid scintillator-based neutrino physics experiment under construction in South China. To reduce the background from external radioactivities, a water Cherenkov detector composed of 35 kton ultra-pure water and 2,400 20-inch photomultiplier tubes is developed. Even after specialized treatment, ultra-pure water still contains trace levels of radioactive elements that can contribute to the detector background. Among which 222 Rn is particularly significant. To address this, an online radon removal system based on the JUNO prototype has been developed. By integrating micro-bubble generators to enhance degasser’s radon removal efficiency, the radon concentration in water can be reduced to 1 mBq/m 3 level, meeting the stringent requirements of JUNO. Additionally, a highly sensitive online radon concentration measurement system capable of detecting concentrations∼ 1 mBq/m 3 has been developed to monitor the radon concentration in water. In this paper, the details regarding both systems will be presented.
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