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Co radiation source under an intense 
Cs radiation field using an application-specific CeBr
spectrometer suited for use in intense radiation fields冠城 雅晃; 島添 健次*; 加藤 昌弘*; 黒澤 忠弘*; 高橋 浩之*
Journal of Nuclear Science and Technology, 59(8), p.983 - 992, 2022/08
被引用回数：1 パーセンタイル：16.36(Nuclear Science & Technology)Passive 
-ray spectroscopy is a useful technique for surveying the radioactive wastes and spent nuclear fuels under nuclear decommissioning. However, this method depends on material properties such as the activity, density, element, scale, and (especially) low-energy rays from 
U and 
Pu. The -decay lines of 
Cs, Cs, Co, and 
Eu occur at greater energies (than those of U and Pu), and these nuclides provide significant information on spent nuclear fuel and radioactive wastes. A CeBr
spectrometer with a small-volume crystal has been previously developed for use in intense radiation measurements. We exposed the spectrometer to radiation dose rates of 0.025, 0.151, 0.342, 0.700, and 0.954 Sv/h under a standard Cs radiation field. A 6.38 MBq Co calibration source was placed in front of the detector surface. Identification of the full energy peak at 1173 keV was impossible at dose rates higher than 0.700 Sv/h. However, subtraction of the Cs radiation spectra from the -ray spectra enabled the identification of the full energy peaks at 1173 and 1333 keV at dose rates of up to 0.954 Sv/h; the relative energy resolution at 1173 and 1333 keV was only slightly degraded at this dose rate.
冠城 雅晃; 島添 健次*; 大鷹 豊*; 上ノ町 水紀*; 鎌田 圭*; Kim, J.*; 吉野 将生*; 庄司 育宏*; 吉川 彰*; 高橋 浩之*; et al.
no journal, ,
Nine years have been passed since the accident of Fukushima Daiichi Nuclear Power Station (FDNPS), and the retrieval of nuclear fuel debris will be planned to start from 2021 fiscal year. But these retrieval samples will include not only nuclear fuel debris, but also the other materials. To accelerate the decommissioning, non-destructive assessments (NDA) for the nuclear fuel debris are required for the quick disposals. We are developing a high energy gamma-ray spectrometer under high dose-rate environments using CeBr scintillator. The goal of this research is to realize gamma-ray spectrometry at dose rates of over 1 Sv/h. Then, we first developed a small cubic CeBr scintillator, and we studied the high dose-rate performance at dose rates of up to 790 mSv/h in a Co field. In this presentation, we will introduce the concept of Multi Cubic high energy gamma-ray spectrometer, and show the high dose-rate performance in a standard radiation field.
検出器によるプルトニウム試料のその場パッシブガンマ測定冠城 雅晃; 芝 知宙; 奥村 啓介; 名内 泰志*; 鈴木 梨沙; 能見 貴佳; 長谷 竹晃; 高田 映*; 小菅 義広*
no journal, ,
高線量率測定用に開発した微小なCeBr検出器を利用して、プルトニウム燃料のパッシブガンマ測定を実施した。測定では、
Amによる59.5keVから
Pu子孫核種
Tlによる2615keVまでの広範囲のエネルギースペクトルを測定でき、また、HPGe測定とも比較し評価したので報告する。
冠城 雅晃; 高橋 浩之*; 島添 健次*; 黒澤 忠弘*; 加藤 昌弘*
no journal, ,
日本原子力研究開発機構廃炉環境国際共同研究センターでは、東京電力ホールディングス福島第一原子力発電所の廃止措置を加速するための研究開発を進めている。本件は、その中でも、原子炉格納容器から取り出しが予定されている燃料デブリと放射性廃棄物の仕分けに資する非破壊測定技術の一環として、報告者がこれまで進めてきたCeBrシンチレーターを利用した高線量率場測定に特化したガンマ線スペクトロメトリステム開発の成果について報告するものである。
