Innovative Alpha Radioactivity Monitor for Clearance Level Inspection Based on Ionized Air Transport Technology : CFD-Simulated and Experimental Ion Transport Efficiencies for Uranium-Attached Pipes
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概要
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An innovative alpha radioactivity monitor for clearance level inspection has been developed. This apparatus measures an ion current resulting from air ionization by alpha particles. Ions generated in a measurement chamber of about 1 m3 in volume are transported by airflow to a sensor and measured. This paper presents computational estimation of the ion transport efficiencies for two pipes with different lengths, the inner surfaces of which were covered with a thin layer of uranium. These ion transport efficiencies were compared with those experimentally obtained for the purpose of validating our model. Good agreement was observed between transport efficiencies from simulations and those experimentally estimated. Dependence of the transport efficiencies on the region of uranium coverage was also examined, based on which such characteristics of ion currents as anticipated errors arising from unknown contaminated positions are also discussed to clarify the effective operation conditions of this monitor.
- 社団法人 日本機械学会の論文
著者
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HIRATA Yosuke
Power and Industrial Systems Research and Development Center, Toshiba Corporation
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SANO Akira
Power and Industrial Systems Research and Development Center, Toshiba Corporation
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Hirata Yosuke
Power And Industrial Systems R&d Center Toshiba Corp.
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Hirata Yosuke
Power & Industrial Systems R & D Center Toshiba Corp.
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NAKAHARA Katsuhiko
Power and Industrial Systems R&D Center, Toshiba Corporation
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SATO Mitsuyoshi
Isogo Nuclear Engineering Center, Toshiba Corporation
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AOYAMA Yoshio
Japan Atomic Energy Agency
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MIYAMOTO Yasuaki
Japan Atomic Energy Agency
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YAMAGUCHI Hiromi
Japan Atomic Energy Agency
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NANBU Kenichi
Tohoku University
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TAKAHASHI Hiroyuki
The University of Tokyo
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ODA Akinori
Nagoya Institute of Technology
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Nakahara Katsuhiko
Power And Industrial Systems R&d Center Toshiba Corp.
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Hirata Yosuke
Power And Industrial Systems Research And Development Center Toshiba Corporation
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Sano Akira
Power And Industrial Systems Research And Development Center Toshiba Corporation
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Nanbu Kenichi
Tohoku Univ. Sendai
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NAKAHARA Katsuhiko
Power and Industrial Systems R&D Center, Toshiba Corporation
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HIRATA Yosuke
Power and Industrial Systems R&D Center, Toshiba Corporation
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SANO Akira
Power and Industrial Systems R&D Center, Toshiba Corporation
関連論文
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- Innovative Alpha Radioactivity Monitor for Clearance Level Inspection Based on Ionized Air Transport Technology : CFD-Simulated and Experimental Ion Transport Efficiencies for Uranium-Attached Pipes
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