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Scintillation properties of praseodymium doped LuAG have been investigated. The crystal is a dense (6.7g/ cm³) scintillator with a short decay time around 20 ns and wavelength emission spectrum peaked at 310 nm. The tested sample was 10 mm× \,10 mm× \,5 mm cuboid, polished on all surfaces. The dopant concentration amounts to 0.23 mol%. A light yield of16000± 1600~ ph/ MeVwas measured using high sensitivity (13.7μ A/ lmF) Photonis photomultiplier (PMT) XP5500B. High quantum efficiency of this PMT (35%) allowed us to register5600± 400 ~ phe/ MeVusing 12μ sshaping time in the spectroscopy amplifier. The measured energy resolution was equal to5.0± 0.1%. Response of LuAG:Pr toγ-rays was found to be proportional over wide energy range. Deviation from proportionality does not exceed 10% at 16.6 keV. This results in good intrinsic energy resolution of LuAG:Pr amounting to3.0± 0.3%, measured with 662 keVγ-rays from¹³⁷ Cs.
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Świderski et al. (2009) studied this question.
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