Europium-doped barium halide scintillators for x-ray and ?-ray detections
J. Selling
M.D. Birowosuto
P. Dorenbos
S. Schweizer
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Abstract
Single crystals of undoped or europium-doped barium chloride, bromide, and iodide were investigated under x-ray and ?-ray excitations. The Eu2+-related x-ray excited luminescence found in the Eu-doped barium halides occurs at 402, 404, and 425?nm for the chloride, bromide, and iodide, respectively. BaCl2:Eu2+ shows the best scintillation properties of the systems investigated. The light yield is about 20?000±2000?photons?per?MeV of absorbed ?-ray energy, the energy resolution for the 662?keV photopeak is 8.8%±0.9%, and the scintillation decay time is 390±40?ns.