Design optimization of liquid scintillator cosmic-ray veto detector with BBQ shifter Page: 4 of 4
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0.3 urn clear Teflon, materials that attenuate the
loi er wavelength butyl-PBD light and give less light
collection at the end of the BBQ shifter by a factor
of 2 in comparison f.o POPOP. This loss factor could
have been eliminated largely by use of UV transmitting
acrylic window and use of a material such as aluminum
foil on the inner surfaces of the liquid container.
Sue i a foil material, having a higher reflectivity
bel >w 400 nm than most white surfaces, allows multiply
ref ected light to reach the BBO that otherwise would
be lost to tlie liquid container surfaces.
Fig. 6. Observed dependence of detector current on
BBO acrylic distance, when stimulated by differing
spectra from liquid scintillators. The thickness of
BBO was 12.5 mm In a semicircular shape. The
positions of the liquid scintillator light on the BBO
Is Illustrated In Fig. 2.
We searched for a good economical reflector which
was chemically compatible with our liquid scintil-
lators, primarily containing xylene. We found that
Epoxy Fateh 560^ met these criteria. It can be
thinned with methanol to permit painting on a large
surface and its reflectivity can also be enhanced by
adding MgO, BaS, or TIOj, Conxnerclally available
vinyl paint appeal s unacceptable since a residue forms
arter a few days. NE—561 and ND707 appear accept-
able from the standpoint of chemical stability and
physical appearance. Evaluation of reflectivity is in
Reflective materials placed adjacent to the BBO
plastic were fou: J to be helpful In retaining n
greater fraction of the Incident light energy.
Crumpled aluminixn foil alLXtilnized Mylar, or white
St. yofoam all Increased light collected at the end of
the BBO ring (Fig. 2) by atout 101. However, an
optical grease coupling between EB0 and the phu -
multiplier red'm' he light collected by 51 in
comparison to pling.
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Kruse, H.W.; Egdorf, S.S. & Simmons, D.F. Design optimization of liquid scintillator cosmic-ray veto detector with BBQ shifter, article, October 1, 1981; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1099399/m1/4/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.