[11p-S622-1~10] 2.1 放射線物理一般・検出器基礎

▲ [11p-S622-2] Growth and scintillation properties of Ce and Mo co-doped RE₃Al₅O₁₂ (RE = Y, Lu) single crystal scintillators

〇KYOUNGJIN KIM¹、Kei Kamada^2,3、Masao Yoshino¹、Yasuhiro Shoji^3,1、Vladimir V. Kochurikhin³、Akihiro Yamaji¹、Shunsuke Kurosawa^2,4、Yuui Yokota²、Yuji Ohashi²、Akira Yoshikawa^1,2,3 (1.IMR, Tohoku Univ.、2.NICHe, Tohoku Univ.、3.C&A Corp.、4.Yamagata Univ.)

キーワード：Scintillator, Co-doping, Garnet

The Mo ion co-doped Ce:YAG and Ce:LuAG single crystals were prepared by micro-pulling (m-PD) down method. Absorption and luminescence spectra were measured together with several other scintillation characteristics, namely the scintillation decay and light yield to reveal the effect of the co-doping. In YAG host, the intensity of anti-site defects (Y(Al) or Al(Y)) related emission at 310 nm was decreased by Mo co-doping. The scintillation decays were accelerated, and light yields were increased about 120% by Mo 1000 ppm co-doping. It is guessed that the suppression of shallow electron traps, generated by the anti-site defects, affected this improvement of scintillation properties.