[22p-F308-1~13] 2.1 Detection Devices

△ [22p-F308-3] Search of Near-Infrared-Emitting Oxide Scintillator Crystal and its Optical Properties

〇(PC)Satoshi Ishizawa¹, Shunsuke Kurosawa^1,2, Akihiro Yamaji^1,2, Akira Yoshikawa^1,2,3 (1.IMR, Tohoku Univ., 2.NICHe, Tohoku Univ, 3.C&A Corporation)

Keywords:Near-Infrared-Emitting Oxide Scintillator, Decommissioning Nuclear Power Plant, Optical property

Decommissioning of the Nuclear Power Plant should be operated with safety, and the distribution of high-dose radioactive debris (more than 10 Sv/h) in the reactor must be revealed. To estimate such high dose rate, a real-time remote radiation monitoring system has been proposed with scintillator and long silica optical fiber by a Japan Atomic Energy Agency research group.
A scintillator with an emission wavelength in the range of 700-1100 nm and no hygroscopic nature was required in order to realize a dose monitor under high-dose rate.
In this study, Nd-doped Gd₂Hf₂O₇ and Nd-doped Lu₂O₃ were grown by Core Heating (CH) Method as a near-infrared-emitting oxide scintillator with no hygroscopic nature.