Actions for An Investigation of X-ray Luminosity versus Crystalline Powder Granularity [electronic resource].

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An Investigation of X-ray Luminosity versus Crystalline Powder Granularity [electronic resource].

Published
Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2012.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
6 : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
At the High-throughput Discovery of Scintillator Materials Facility at Lawrence Berkeley National Laboratory, scintillators are synthesized by solid-state reaction or melt mixing, forming crystalline powders. These powders are formed in various granularity and the crystal grain size affects the apparent luminosity of the scintillator. To accurately predict a "full-size" scintillator's crystal luminosity, the crystal luminosity as a function of crystal granularity size has to be known. In this study, we examine Bi₄Ge₃O₁₂ (BGO), Lu₂SiO₅:Ce (LSO), YAlO₃:Ce (YAP:Ce), and CsBa₂I₅:Eu{sup 2+} (CBI) luminosities as a function of crystalline grain size. The highest luminosities were measured for 600- to 1000-{micro}m crystal grain sizes for BGO and LSO, for 310- to 600-{micro}m crystal grain sizes for CBI, and for crystal grains larger than 165{micro}m for YAP:Ce. Crystal grains that were larger than 1 mm had a lower packing fraction, and smaller grains were affected by internal scattering. We measured a 34% decrease in luminosity for BGO when decreasing from the 600- to 1000- {micro}m crystal grain size range down to the 20- to 36-{micro}m range. The corresponding luminosity decrease for LSO was 44% for the same grain size decrease. YAP:Ce exhibited a luminosity decrease of 47% when the grain size decreased from the 165- to 310-{micro}m crystal grains to the 20- to 36-{micro}m range, and CBI exhibited a luminosity decrease of 98% when the grain size decreased from the 310- to 600-{micro}m crystal grain range to the 36- to 50-{micro}m range. We were able to very accurately estimate full-size crystal luminosities from crystalline grains that are larger than 90 {micro}m.
Report Numbers
E 1.99:lbnl-5356e
lbnl-5356e
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Note
Published through SciTech Connect.
03/07/2012.
"lbnl-5356e"
Nuclear Instruments and Methods in Physics Research A 659 1 FT
Bourret-Courchesne, Edith; Borade, Ramesh.
Life Sciences Division
Funding Information
DE-AC02-05CH11231
View MARC record | catkey: 14399177