Optical and scintillation properties of Ce-doped (Gd2Y1)Ga2.7Al2.3O12 single crystal grown by Czochralski method
02 engineering and technology
0210 nano-technology
7. Clean energy
DOI:
10.1016/j.nima.2016.02.086
Publication Date:
2016-03-04T23:58:10Z
AUTHORS (7)
ABSTRACT
Abstract Multicomponent garnets, due to their excellent light yield and energy resolution, become one of the most promising scintillators used for homeland security and nuclear non-proliferation applications. This work focuses on the optimization of Ce-doped (Gd,Y) 3 (Ga,Al) 5 O 12 scintillators using a combination strategy of pre-screening and scale-up. Ce-doped Gd x Y 1− x Ga y Al 5− y O 12 ( x =1, 2 and y =2, 2.2, 2.5, 2.7, 3) polycrystalline powders were prepared by high-temperature solid state reaction method. The desired garnet phase in all the samples was confirmed using X-ray diffraction measurement. By comparing the radioluminescence intensity, the highest scintillation efficiency was achieved at a component of Gd 2 Y 1 Ga 2.7 Al 2.3 O 12 :Ce powders. A (Gd 2 Y 1 )Ga 2.7 Al 2.3 O 12 doped with 1% Ce single crystal with dimensions of O35×40 mm was grown by Czochralski method using a oriented seed. Luminescence and scintillation properties were measured. An optical transmittance of 84% was achieved in the concerned wavelength from 500 to 800 nm. Its 5d–4f emission of Ce 3+ is at 530 nm. The light yield of a Ce1%: Gd 2 Y 1 Ga 2.7 Al 2.3 O 12 single crystal slab at a size of 5×5×1 mm 3 can reach about 65,000±3000 Ph/MeV along with two decay components of 94 and 615 ns under 137 Cs source irradiation.
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