論文

査読有り
2018年6月3日

Production and detection of fission-induced neutrons following fast neutron direct interrogation to various dry materials containing 235U

Journal of Nuclear Science and Technology
  • Akihiro Sakoda
  • ,
  • Yoshiaki Nakatsuka
  • ,
  • Yuu Ishimori
  • ,
  • Shinichi Nakashima
  • ,
  • Masao Komeda
  • ,
  • Akira Ohzu
  • ,
  • Yosuke Toh

55
6
開始ページ
605
終了ページ
613
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1080/00223131.2017.1417175
出版者・発行元
Taylor and Francis Ltd.

For better nuclear material accountancy, we had developed a non-destructive assay system dedicated to uranium waste drums (JAWAS-N: JAEA Waste Assay System at Ningyo-toge). The system is based on a fast neutron direct interrogation (FNDI) method. To clarify the characteristics of the FNDI method and the performance of JAWAS-N, experimental and computational mock-up tests were carried out using various dry materials that contained known amounts of natural uranium. As a result, linearity between the die-away time (τ2) and the counts of fast neutrons attributed to 235U fission was confirmed. Moreover, the MCNP simulation was performed to discuss the radial and axial dependences of 235U fission probability, neutron detection efficiency, and sensitivity on uranium distributions in the drum. The simulation results agreed with the empirical results reported in a previous paper, providing valuable information on the practice of FNDI-based uranium determination. Furthermore, the nominal detection limits of natural uranium in JAWAS-N were estimated to be 15, 4, and 2 g for τ2 = 0.2, 0.3, and 0.4 msec, respectively. The findings obtained here will contribute to the implementation of the FNDI method to assess the quantities of 235U in actual uranium waste drums.

Web of Science ® 被引用回数 : 1

リンク情報
DOI
https://doi.org/10.1080/00223131.2017.1417175
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000430050300003&DestApp=WOS_CPL
URL
http://orcid.org/0000-0002-2494-5557

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