模擬デブリのエネルギー差分型吸収CT測定

Measurement of simulated debris by CT of differential absorption of radiant energy

冨永 亜希; 菖蒲 敬久  ; 佐藤 志彦   ; 辻 卓也  ; 松村 大樹   ; 城 鮎美*; 桑水流 理*; 宇埜 正美*

Tominaga, Aki; Shobu, Takahisa; Satou, Yukihiko; Tsuji, Takuya; Matsumura, Daiju; Shiro, Ayumi*; Kuwatsuru, Osamu*; Uno, Masayoshi*

イメージング法とXAFS法の特徴である元素選択性に着目し、対象となる元素の吸収端近傍のエネルギー走査を行い、対象となる元素を多く含んだ利用域の特定、及びその結晶構造、価数といった情報を取得するCT-XAFS法をBL22XUに構築することを目的として開発を行った。本研究では、共晶反応を利用し1800CでUOとBOを溶融凝固させて作成した模擬燃料デブリに放射光を照射し、X線CT法により内部観察を行った。内部を確認した後、U-LIII端周辺のエネルギーでCT像を取得した。

We focused on element selectivity, which is a feature of the imaging method and the XAFS method. The research purpose is to construct the CT-XAFS method on BL22XU. We have constructed a system that enables energy scanning near the absorption edge of target elements. In the measurement, we identified the scan energies containing many target elements. Based on the results, we built a technology to obtain information on the crystal structure and valence. The simulated debris of the measurement sample was made by melting and solidifying UO and BO at 1800C using eutectic reaction. Simulated fuel debris was irradiated with synchrotron radiation, and its interior was observed using the X-ray CT method. After confirming the inside, a CT image was acquired at the energy around the U-L edge. In the presentation, we will report on the construction status of the measurement technology, the acquisition of XAFS spectra at specific locations inside the material from CT images, and the presence or absence of structural differences due to differences in fabrication methods.