Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nimpa.417..278b&link_type=abstract
Nuclear Instruments and Methods in Physics Research, Sect. A, Vol. 417, No. 2 - 3, p. 278 - 296
Physics
11
Detectors: Solar Neutrinos
Scientific paper
An on-line purification system for a large-scale low-background liquid scintillation detector has been tested with the 5 t 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 t 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.
Benziger Jay B.
Calaprice Frank P.
Chen Michelle
Darnton N.
Johnson Michael
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