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Scintillation properties of the new Tl 2 LaCl 5 : xCe 3+ where x=0, 0.5, 1 and 10 mol % (TLC: Ce 3+ ) single crystals are presented. Two zones vertical Bridgman technique is used for the growth of this scintillation material. High Z-number (79) of this material offer excellent detection efficiency for X- and γ-rays. Grown samples are characterized under X- and γ-rays excitation in order to find the emission wavelength, energy resolution, light yield, and decay time. Emission spectra exhibit Ce 3+ emission bands between 350–550 nm and peaking at 389 nm. The obtained energy resolution and light yield increases with high Ce-concentration. Energy resolution and light yield of 10%Ce-doped sample are found to be 6.9% (FWHM) and 51,000±5000 ph/MeV, respectively at room temperature. For the grown samples, two exponential decay time constants are found. The measured decay time constants showed variation in their values with respect to Ce-concentrations in the host crystal. Fast decay time constant of 31 ns with 87% light emission is found for 10%Ce sample. Scintillation results suggested that TLC will be one of the promising next generation scintillator for the medical imaging techniques such as Positron Emission Tomography (PET). [ABSTRACT FROM AUTHOR]

Growth, luminescence and scintillation characterizations of the new Tl 2 LiGdCl 6 :Ce 3+ (TLGC:Ce 3+ ) single crystals are reported. This crystal was grown by the Bridgman technique and the composition belongs to the elpasolites family. X-ray induced emission spectra of the Ce-doped samples show the emission between 360 and 440 nm and peaking at 387 nm. The emission was attributed to the Ce 3+ ions in the host lattice. The highest light yield of 58,000±6000 ph/MeV and 4.6±0.2% (FWHM) energy resolution was obtained for 10% Ce doped sample. Three decay time components were observed for the 10% Ce-concentration under γ-ray excitation at room temperature. Among the decay time constants, the fast decay time constant of 34 ns (81%) due to Ce 3+ luminescence was obtained. Further investigation to improve scintillation material is underway. [ABSTRACT FROM AUTHOR]

Abstract: We report on the luminescence and scintillation characterizations of cerium doped Cs2LiGdBr6 (CLGB) single crystal. This is a new scintillation material and belongs to elpasolite family. Single crystals of CLGB: Ce3+ with dimensions up to ∅10×5mm3 are successfully grown by the Bridgman technique. Under X-ray excitation, broad emission band between 370 to 478nm wavelengths is obtained. Such emission is attributed to the cerium ion. At 662keV γ-rays CLGB: Ce3+ shows energy resolutions of 7.1%, 9.4%, and 8.6% (FWHM) at 1%, 5%, and 10% Ce-concentrations, respectively. Light yield of CLGB depends on cerium concentration and maximum light yield of ~30,500ph/MeV is measured for 10% Ce sample crystal. Under γ-ray excitation, CLGB: Ce3+ crystals showed three exponential decay time components. [Copyright &y& Elsevier]