Luminescence and scintillation properties of Lu0.8Gd1.2SiO5:Ce and Lu1.8Gd0.2SiO5:Ce single crystals: A comparative study

The luminescence and scintillation properties of Lu0.8Gd1.2SiO5:Ce and Lu1.8Gd0.2SiO5:Ce single crystals are compared. At 662 keV γ-rays, light yield (LY) value of 29,800 ph/MeV obtained for Lu1.8Gd0.2SiO5:Ce is much higher than that of 20,200 ph/MeV obtained for Lu0.8Gd1.2SiO5:Ce. The energy resolution of 6.0% obtained for Lu0.8Gd1.2SiO5:Ce is better than that of 7.7% for Lu1.8Gd0.2SiO5:Ce due to its better intrinsic resolution and proportionality of LY. The LY and energy resolution for α-rays, as well as a LY ratio under excitation with α- and γ-rays (α/γ ratio) are also determined. The intrinsic LY and light loss coefficient under excitation with α- and γ-rays are evaluated. The photofraction at 662 keV γ-rays is also determined and discussed.