10:15 〜 10:30
▲ [21a-C213-6] Effect of Mo co-doping on scintillation properties of Ce:Gd3(Ga, Al)5O12 single crystal scintillators with various Al-to-Ga ratios
キーワード：Scintillator, GAGG, Co-doping
The Cerium doped Gadolinium Aluminum Gallium Garnet (Ce:Gd3(Ga,Al)5O12, Ce:GAGG) presented by Kamada et al. is the most attractive scintillator material from the point of view of light output, decay time, energy resolution, density and absence of intrinsic radioactivity. Many studies have been continued on the effects of rare earth doping and/or co-doping with various cations in GAGG crystal structure, multicomponent garnet based on Y3Al5O12 (YAG) crystal with an admixture of Ga and Gd, to improve its properties. It was reported that the scintillation properties of Ce:GAGG are dependent on the ratio of Ga to Al.
In this study, the performance of Mo co-doped Ce0.5%:Gd3GaxAl5−xO12 single crystal scintillators with different ratio of Al and Ga (x=2.4, 2.7, 3.0) was investigated. All these crystals were prepared by the micro-pulling down (m-PD) method with a wide concentration range of the Mo co-dopant. We have investigated the relationship between the effect of reducing Ga content in Ce:GAGG and the effect of co-doping with Mo ion in Ce:GAGG. The scintillation properties of the grown crystals such as light yield and scintillation decay time and non-proportionality in scintillation response were evaluated. Light output was increased in a sample with the small amount of Mo concentration and maximum light output of 112% compared to the non co-doped Ce:GAGG was obtained in the Mo 300 ppm co-doped crystal with x=3.0. The scintillation decay was also accelerated to 57.2 ns by Mo 500 ppm co-doping with x=3.0. The Mo co-doped crystals with x=3.0 showed a higher light yield and faster decay time than those with x=2.4 and 2.7.
In this study, the performance of Mo co-doped Ce0.5%:Gd3GaxAl5−xO12 single crystal scintillators with different ratio of Al and Ga (x=2.4, 2.7, 3.0) was investigated. All these crystals were prepared by the micro-pulling down (m-PD) method with a wide concentration range of the Mo co-dopant. We have investigated the relationship between the effect of reducing Ga content in Ce:GAGG and the effect of co-doping with Mo ion in Ce:GAGG. The scintillation properties of the grown crystals such as light yield and scintillation decay time and non-proportionality in scintillation response were evaluated. Light output was increased in a sample with the small amount of Mo concentration and maximum light output of 112% compared to the non co-doped Ce:GAGG was obtained in the Mo 300 ppm co-doped crystal with x=3.0. The scintillation decay was also accelerated to 57.2 ns by Mo 500 ppm co-doping with x=3.0. The Mo co-doped crystals with x=3.0 showed a higher light yield and faster decay time than those with x=2.4 and 2.7.