26 September 2013 Residual gas analysis of volatile impurities in halide precursors for scintillator crystals
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Abstract
Alkaline-earth halides can be made into bright scintillators if purity is maintained during synthesis and growth. In order to investigate precursor purity, beaded halide precursors were heated under vacuum and evolved gas was assessed by residual gas spectroscopy. These precursors included cesium chloride, lithium chloride, yttrium chloride, cerium chloride, strontium iodide, europium iodide, barium bromide, and europium bromide. Water and CO2 desorption, sulfur release, argon release, and halide dissociation was observed in samples. Triply-oxidized precursors showed multiple paths to decomposition. The data inform approaches toward purification and growth.
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S. Swider, S. Motakef, A. Datta, W. M. Higgins, "Residual gas analysis of volatile impurities in halide precursors for scintillator crystals", Proc. SPIE 8852, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XV, 88521P (26 September 2013); doi: 10.1117/12.2034232; https://doi.org/10.1117/12.2034232
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