A scintillator purification system for a large scale solar neutrino experiment

J. B. Benziger

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

An on-line purification system for a large-scale low-background liquid scintillation detector has been tested with the 5-ton liquid scintillation detector, the Counting Test Facility at Gran Sasso. Counter-current water extraction removes polar and charged impurities such as ions and metal salts. Vacuum distillation of the entire scintillator has been applied to remove both radioactive impurities and chemical impurities that affect the optical properties of the scintillator. Filtration with a 0.05 μm particulate filter removed suspended dust particles that may contain U, Th and K. Nitrogen stripping was employed to remove dissolved water and noble gases (e.g. 85Kr) from the scintillator. The system has effectively reduced the internal back in the 5 ton liquid scintillation detector from 470±90 events/d to the detection limit of the detector (±45 events/d) in the energy window 250<E<800 keV.

Original languageEnglish (US)
Pages (from-to)105-110
Number of pages6
JournalNuclear Physics B - Proceedings Supplements
Volume78
Issue number1-3
DOIs
StatePublished - Aug 1999

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics

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