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Scintillators having a high effective atomic number (Zeff) and density is required for the efficient detection of X and γ-rays. Due to high Z-number and density of thallium ion in the host material enhances the density and Zeff of a scintillator [1-2]. Our group recently discovered new thallium based Tl2GdCl5 (TGC) scintillator which shows higher density and Zeff of 5.10 g/cm3 and 71, respectively. Luminescence and scintillation properties of TGC: x% Ce (x = 0, 1, 5 and 10 mole %) is presented. This material is grown by two zones vertical Bridgman technique. Luminescence under X-ray excitation for pure TGC crystal shows Tl+ ion emission in the range of 350-600 nm peaking at 400 nm [3] while 1, 5 mole% Ce3+ doped TGC samples shows Ce3+ emission in the range of 350-500 nm peaking at 389 and 393 nm. Scintillation properties such as light yield, energy resolution and decay time are investigated under 662 keV γ-rays from a 137Cs source at room temperature. Best energy resolution and light yield are found to be ≥5% (FWHM) and 53,000±5,300 ph/MeV, respectively. Three decay time components are obtained under γ-rays excitation for all the samples. The investigated results revealed that this scintillator could be a potential candidate for the radiation detection in different applications such as medical imaging etc.
[1] H. J. Kim, Gul Rooh, Arshad Khan, Sunghwan Kim, Nucl. Intrum. Method Phys. Res. A, 849 (2017) 72–75.
[2] Gul Rooh, H. J. Kim, Jonghun Jang, Sunghwan Kim, J. Lumin., 187 (2017) 347–351.
[3] Y. Fujimoto et al., Jpn. J. Appl. Phys., 55 (2016) 090301–090303.
