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Scintillation properties of the new Tl2LaCl5: xCe3+ where x = 0, 0.5, 1 and10 mole % (TLC: Ce3+) single crystals are presented. Two zones verticalBridgman technique is used for the growth of this scintillation material. HighZ-number (79) of this material offer excellent detection efficiency for X- and{\gamma}-rays. Grown samples are characterized under X- and {\gamma}-raysexcitation in order to find the emission wavelength, energy resolution, lightyield, and decay time. Emission spectra exhibit Ce3+ emission bands between 350- 550 nm and peaking at 389 nm. The obtained energy resolution and light yieldincreases with high Ce-concentration. Energy resolution and light yield of10%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 decaytime constants are found. The measured decay time constants showed variation intheir values with respect to Ce-concentrations in the host crystal. Fast decaytime 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 nextgeneration scintillator for the medical imaging techniques such as PositronEmission Tomography (PET).

Tl2LaCl5 (Ce3+): New Fast and Efficient Scintillator for X- and {\gamma}-ray detection