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.
We have developed the detached Bridgman process for growth of CdZnTe crystals. Detachment of the solidification
interface from the growth ampoule results in a low density of dislocations in the grown material and large single crystal
grains. The detached Bridgman process also provides for direct control of the melt composition close to the growth front,
allowing for accurate control of both the density of the Te/Cd precipitates as well as the majority carrier concentration in
the grown material. The influence of melt-composition control and compensation by shallow and deep donors on
detector performance is presented.