Study on the large area MCP-PMT glass radioactivity reduction
arXiv:1710.09965 · doi:10.1016/j.nima.2018.05.008
Abstract
The Jiangmen Underground Neutrino Observatory (JUNO) will install about 18,000 20-inch Photomultiplier Tubes (PMTs) in the center detector to achieve 3%/sqrt(E(MeV)) energy resolution. From the full detector Monte Carlo (MC) simulation, besides the liquid scitillator (LS) and Acrylic nodes, PMT glass has the largest contribution to the natural radioactive background. Various technologies have been developed in the Chinese industry to control the environment and to improve the production process. We have monitored the glass production for more than two months, and the radioactivity in glass was measured using a low background gamma ray spectrometer equipped with a high resolution HPGe detector. The 238U, 232Th and 40K of the glass bulb are reduced by a factor of 2, 9 and 15 respectively, and now they can reach 2.5 Bq/kg for 238U, 0.5 Bq/kg for 232Th and 0.5 Bq/kg for 40K.
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Cited by in corpus (8)
- Mass Testing and Characterization of 20-inch PMTs for JUNO
- Mass production and characterization of 3-inch PMTs for the JUNO experiment
- Radioactivity control strategy for the JUNO detector
- A quantitative approach to select PMTs for large detectors
- Feasibility and physics potential of detecting B solar neutrinos at JUNO
- Capability of detecting low energy events in JUNO Central Detector
- JUNO Physics and Detector
- Understanding VSiPMT: a comparison with other large area hybrid photodetectors