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SUMMARY:Measurements of radioactive purity of  WLS plates for water Cheren
 kov detectors
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261021T233314Z
UID:indico-contribution-6497@cern.ch
DESCRIPTION:Speakers: Vladimir Kazalov (INR RAS)\nThe next generation wate
 r Cherenkov detector Hyper-Kamiokande in its outer part will utilize light
 -collection modules composed of a PMT surrounded by a plexiglass-based WLS
  plate.  Success of the rich physics program of the experiment that ranges
  from energetic atmospheric and accelerator and down to cosmic and solar n
 eutrinos involves strict requirements and control of the radiopurity of th
 e elements used in the detector. The talk presents the results of the chec
 ks of the specific activity of natural radionuclides in the samples of the
  WLS plates. The work was carried out in two underground laboratories of t
 he Baksan Neutrino Observatory of INR RAS: the “NIKA‑2” facility loc
 ated at a depth of 660 m water equivalent and the “SNEG” spectrometer 
 in the DUBL‑4900 hall at a depth of 4900 m.w.e.. The measurements were p
 erformed with the HPGe-based gamma-detectors. The final sensitivity of mBq
 /kg was achieved. It was demonstrated that the samples of the mass-product
 ion WLS plates possess low natural radioactivity that fulfils the requirem
 ents set by the Hyper-Kamiokande physics program. The work confirms the ef
 fectiveness of the low‑background gamma‑ray spectrometry technique for
  the quality control of materials used in large‑scale neutrino detectors
 .\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6497/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6497/
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