We report the luminescence and scintillation properties of TlSr2Cl5 crystals, which have a large effective atomic number (Zeff = 63.7), for application in X-ray and gamma ray detection. TlSr2Cl5 crystals were prepared under vacuum using the self-seeding solidification method. The scintillation emission bands were observed at 430 and 490 nm, which are close to the emission wavelengths of TlMgCl3 and TlCdCl3. The peak wavelengths were characteristic of self-activated thallium-based chloride crystals. The scintillation decay time constants were estimated to be 7.5 ns (61%), 99 ns (7%), and 1375 ns (32%). These decay time constants are close to those of TlMgCl3 and TlCdCl3 and are also characteristic of self-activated thallium-based chloride crystals. The light yield of TlSr2Cl5 was estimated to be approximately 19,000 photons/MeV, which is higher than that of Gd2SiO5(Ce) (GSO) (10,000 photons/MeV) and close to that of Lu2SiO5(Ce) (LSO) (27,000 photons/MeV).
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