Abstract
In this paper we report on the scintillation properties of TlSr2I5 doped with Eu2+, a novel thallium-containing high-resolution scintillator for gamma-ray spectroscopy. Small diameter, good quality crystals of TlSr2I5:Eu (TSI) with different Eu2+ concentrations were grown by the vertical Bridgman method. X-ray diffraction measurements show that single crystals of TSI belong to the monoclinic system with space group P21/c. TlSr2I5 has a density of 5.32 g/cm3 and effective Z of 60. The X-ray excited emission of Eu2+ doped TlSr2I5 features a broad emission band peaking between 460–470 nm. The light yield of TlSr2I5 crystal doped with 1% Eu2+ is measured to be ∼72,000 ph/MeV with an energy resolution of 2.8% at 662 keV. The scintillation decay time which is characteristic of Eu2+ shows two components, with ∼90% of the light in a ∼500 ns component and the rest in a longer component of ∼3 μs.
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