[20a-A102-1~11] 2.1 Detection Devices

[20a-A102-5] Scintillation Properties of Nd-Doped Y₃Al₅O₁₂ Oxide-Scintillators for the Decommissioning Monitoring System in the Nuclear Plant

〇(M1C)Daisuke Matsukura^1,2, Shunsuke Kurosawa^2,3,4, Vladimir Kochurikhin⁵, Shohei Kodama⁶, Chihaya Fujiwara^1,2, Akihiro Yamaji^2,3, Yuji Ohashi^2,3, Yuui Yokota², Kei Kamada^2,3, Hiroki Sato^2,3, Satoshi Toyoda^2,3, Masao Yoshino^2,3, Takashi Hanada², Rikito Murakami², Takahiko Horiai^2,3, Akira Yoshikawa^2,3,5 (1.Tohoku Univ. Graduate School of Eng., 2.Tohoku Univ. IMR, 3.Tohoku Univ. NICHe, 4.Osaka Univ. ILE, 5.C&A, 6.Saitama Univ. sci. and eng.)

Keywords:Single crystalline scintillator, long emission wavelength, gamma radiation detection

For the decommissioning of the Fukushima Daiichi Nuclear Power Plant, a gamma-ray scintillator with high light output and a long emission wavelength of over 600 nm are required to obtain sufficient sensitivity. Here, we focused on an Nd-doped Y₃Al₅O₁₂ (YAG) scintillator, which is known as an oxide scintillator glowing with a wavelength of 900 nm, and we also co-doped Tb with a concentration of to increase absorption bands originating from Tb-O charge transfer. The Nd-doped YAG single crystals were grown by the Czochralski process and measured their radio-luminescence. The results showed the emission wavelength at peak intensity was approximately 890 nm, which achieved the emission goal