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• 关键词：A1. Characterization ; A2. Bridgman technique ; B1. Halides ; B1. Rare earth compounds ; B2. Scintillator materials ; B3. Scintillators
• 刊名：Clinical Biochemistry
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：41
• 期：10-11
• 页码：IFC
• 全文大小：457 K

文摘

In this paper we report on the crystal growth and characterization of a new class of inorganic scintillators based on the rare earth iodides, in particular LuI₃, YI₃ and GdI₃, doped with trivalent cerium. Single crystals of LuI₃:Ce³⁺, YI₃:Ce³⁺ and GdI₃:Ce³⁺ were grown by the vertical Bridgman technique in evacuated silica ampoules. In some cases, tantalum or graphite crucibles were used to minimize wetting of the ampoule. X-ray excited optical luminescence spectra of LuI₃:Ce³⁺, YI₃:Ce³⁺ and GdI₃:Ce³⁺ exhibit a broad band due to Ce³⁺ emission, peaking in the 500–550 nm region. LuI₃:Ce³⁺, YI₃:Ce³⁺ and GdI₃:Ce³⁺ show high light yields up to 100,000 photons/MeV and fast principle decay time constants of <40 ns. Energy resolutions measured at 662 keV are of the order of 3.5–9 % (FWHM).