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FPを含むPu溶液のモニタリング技術に係る適用性調査研究; GAGG検出器の設計及びガンマスペクトル測定

Feasibility study of technology for Pu solution monitoring including FP; Design of GAGG detector and gamma spectrum measurement

関根 恵; 松木 拓也; 所 颯; 蔦木 浩一; 富川 裕文; 中村 仁宣

Sekine, Megumi; Matsuki, Takuya; Tokoro, Hayate; Tsutagi, Koichi; Tomikawa, Hirofumi; Nakamura, Hironobu

再処理施設においては、プルトニウム(Pu)モニタリングのさらなる適用拡大を図るため、核分裂生成物(FP)を含むPu溶液中のPu量を測定可能な検出器開発が必要である。中性子測定とあわせて定量化を目指し、Puモニタリングに適用可能な$$gamma$$線を調べるため、高線量下、広範囲のエネルギーが測定可能かつ高い分解能を持つCe:GAGG (Ce:Gd$$_{3}$$Al$$_{2}$$Ga$$_{3}$$O$$_{12}$$)シンチレータを装備した検出器(対象:高放射性廃液)を新たに設計・開発した。その検出器を用いてコンクリートセル内で、同廃液に対し$$gamma$$線スペクトル測定を実施したところ、高エネルギー$$gamma$$線(約9.5MeV)を測定可能とし、FPによる$$gamma$$線以外の3MeVを超える高エネルギー$$gamma$$線スペクトルを初めて確認することができた。本発表では、検出器の設計、$$gamma$$線スペクトル測定結果、Puモニタリングへの適用性評価及び今後の計画について報告する。(本技術開発は、文部科学省核セキュリティ補助金事業の一環として実施している。)

In a reprocessing facility, it is necessary to develop a detector which is measurable plutonium (Pu) amount in the Pu solution containing the Fission Product (FP) in order to expand the application of Pu monitoring. To investigate $$gamma$$ rays which is applicable for Pu monitoring, Ce:GAGG (Ce: Gd$$_{3}$$Al$$_{2}$$Ga$$_{3}$$O$$_{12}$$) scintillator which can measure a wide range of energy at high dose and has high resolution (Target: High Active Liquid Waste (HALW)) was newly designed and developed in deal with aim for Pu quantitativeness. $$gamma$$ ray measurement was performed to the HALW in the concrete cell using the detector, and it was confirmed that high energy $$gamma$$ rays (9.5 MeV) could be measured and high energy $$gamma$$ rays spectra over 3 MeV without deriving from FP at the first time. In this presentation, detector design, results of $$gamma$$ ray spectra measurement, applicability evaluation to Pu monitoring and the future plan are presented. This project has been carried out under the support of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese government.

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