Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
村上 昌史; 吉田 幸彦; 南郷 脩史*; 久保田 省吾*; 黒澤 卓也*; 佐々木 紀樹
Journal of Nuclear Science and Technology, 62(7), p.650 - 661, 2025/07
被引用回数：1 パーセンタイル：59.09(Nuclear Science & Technology)Nondestructive methods were investigated to effectively discriminate disposal-restricted materials, including aluminum, batteries, combustibles, lead, and mercury, inside waste containers without opening them. An industrial computed tomography (CT) system with maximum X-ray energy of 9 MeV was used to visualize inside 27-cm diameter pails and 59-cm diameter drums filled with typical waste materials such as combustibles, glass, concrete, and metals. The CT images with 0.5 mm spacing were acquired, and three-dimensional (3D) models were constructed. A good linear relationship was observed between the gray values in the obtained CT images and the densities of materials. Combustibles, lead, and mercury were extracted via simple segmentation based on their apparent densities. 3D feature-based discriminations were further applied to batteries and certain aluminum objects based on their structural characteristics. Almost all batteries contained in the drums were successfully discriminated regardless of deformation, except for a few cases under extreme conditions. Aluminum was extracted along with glass and concrete; however, pipes with distinctive shapes could be identified in a relatively selective manner. The discrimination methods developed in this study will be effective in revealing the contents of waste containers, particularly for harmful materials that need to be separated for proper disposal.
國分 祐司; 細見 健二; 瀬谷 夏美; 永岡 美佳; 井上 和美; 小池 優子; 長谷川 涼; 久保田 智大; 平尾 萌; 飯澤 将伍; et al.
JAEA-Review 2024-053, 116 Pages, 2025/03
JAEA-Review-2024-053.pdf:3.26MB
本報告書は、原子力規制関係法令を受けた「再処理施設保安規定」、「核燃料物質使用施設保安規定」、「放射線障害予防規程」、「放射線保安規則」及び茨城県等との「原子力施設周辺の安全確保及び環境保全に関する協定書」、「水質汚濁防止法」並びに「茨城県条例」に基づき、令和5年4月1日から令和6年3月31日までの期間に日本原子力研究開発機構核燃料サイクル工学研究所から環境へ放出した放射性排水の放出管理結果を取りまとめたものである。再処理施設、プルトニウム燃料開発施設をはじめとする各施設からの放射性液体廃棄物は、濃度及び放出量ともに保安規定及び協定書等に定められた基準値を十分に下回った。
Sb
O
F observed by high-resolution synchrotron and neutron diffraction下野 聖矢*; 石橋 広記*; 永吉 祐輔*; 池野 豪一*; 河口 彰吾*; 萩原 雅人; 鳥居 周輝*; 神山 崇*; 市橋 克哉*; 西原 禎文*; et al.
Journal of Physics and Chemistry of Solids, 163, p.110568_1 - 110568_7, 2022/04
被引用回数：2 パーセンタイル：10.04(Chemistry, Multidisciplinary)The structural phase transition from cubic (
) to a 
tetragonal (
) at 
180 K was found in non-centrosymmetric oxyfluoride CoSbOF by high-resolution neutron and synchrotron powder diffraction. To investigate this phase transition, specific heat, magnetization, and dielectric measurements were performed. Although the specific heat and dielectric constant showed anomalies at , a phase transition to ferroelectricity was not observed in the polarization hysteresis loop down to 30 K. The rotation of the CoO
F octahedron was observed at from the structural analysis using synchrotron and neutron powder diffraction data. It was found that the magnetic phase transition from paramagnetic to G-type antiferromagnetic occurred at 
67 K, at which a peak was observed in the specific heat measurements, via magnetic structure analysis using neutron powder diffraction data. The magnetic moments of Co
were aligned along the tetragonal 
-axis direction with a Co moment of 2.80(1) 
at 13 K.
村上 昌史; 吉田 幸彦; 南郷 脩史*; 久保田 省吾*; 黒澤 卓也*; 佐々木 紀樹
no journal, ,
過去に発生し、保管されてきている低レベル放射性廃棄物の処分において、埋設施設の廃棄物受入基準により量が制限される物質を、基準値以上に含む場合には廃棄物から取り除く必要がある。これらの物質の定量評価を合理的に行う手法として、高エネルギーX線を用いた非破壊検査により、容器内の廃棄物を識別できる可能性がある。今回、処分制限物質として可燃物,アルミ,鉛,水銀及び電池を含む模擬廃棄物を容器内に封入し、産業用CTスキャナーを用いて高エネルギーX線CTを撮影した。発表では、測定したCT画像における画素値や3次元立体像における形状の解析をもとに、これらの物質の識別方法を検討した結果について報告する。
