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論文

Non-destructive analysis of samples with a complex geometry by NRTA

Ma, F.; Kopecky, S.*; Alaerts, G.*; 原田 秀郎; Heyse, J.*; 北谷 文人; Noguere, G.*; Paradela, C.*; $v{S}$alamon, L.*; Schillebeeckx, P.*; et al.

Journal of Analytical Atomic Spectrometry, 35(3), p.478 - 488, 2020/03

AA2019-0356.pdf:2.54MB

 被引用回数:1 パーセンタイル:34.45(Chemistry, Analytical)

The use of Neutron Resonance Transmission Analysis to characterize homogeneous samples not fulfilling good transmission geometry conditions is discussed. Analytical expressions for such samples have been derived and implemented in the resonance shape analysis code REFIT. They were validated by experiments at the time-of-flight facility GELINA using a set of metallic natural copper samples. The expressions were used to derive sample characteristics by a least squares adjustment to experimental transmission data. In addition, the resonance parameters of Cu for energies below 6 keV, which are reported in the literature and recommended in evaluated data libraries, were verified. This research was implemented under the subsidiary for nuclear security promotion of MEXT.

論文

NRD demonstration experiments at GELINA

Paradela, C.*; Alaerts, G.*; Becker, B.*; 原田 秀郎; Heyse, J.*; 北谷 文人; 小泉 光生; Kopecky, S.*; Mondelaers, W.*; Moens, A.*; et al.

EUR-27507-EN, 16 Pages, 2015/04

Neutron Resonance Densitometry (NRD), a non-destructive analysis method, is presented. The method has been developed to quantify special nuclear material (SNM) in debris of melted fuel that will be produced during the decommissioning of the Fukushima Daiichi Nuclear Power Plants. The method is based on Neutron Resonance Transmission Analysis (NRTA) and Neutron Resonance Capture Analysis (NRCA). The quantification of SNM relies on the NRTA results. The basic principles of NRD, which are based on well-established methodologies for neutron resonance spectroscopy, are explained. To develop NRD for the characterization of rock- and particle like heterogeneous samples a JAEA/JRC collaboration has been established. As part of this collaboration a NRD demonstration workshop was organized at the TOF facility GELINA of the JRC-IRMM. The results of this workshop are presented. They illustrate the potential of measurements of complex mixtures of different elements. It is demonstrated that the elemental composition of an unknown sample predicted by NRTA deviated on average by less than 2% from the declared value. In addition the potential to identify the presence of light elements by NRCA is shown.

口頭

Characterization of nuclear material by neutron resonance transmission analysis

Schillebeeckx, P.*; Alaerts, G.*; Becker, B.*; Paradela, C.*; Heyse, J.*; Kopecky, S.*; Vendelbo, D.*; Wynants, R.*; 原田 秀郎; 北谷 文人; et al.

no journal, , 

中性子共鳴反応を利用して非破壊で試料を分析する手法に、中性子共鳴透過分析法(NRTA)がある。NRTAは中性子を試料に照射し、透過してくる中性子を計測することで試料を分析する。我々はJRC-IRMM(共同研究センター/標準物質・測定研究所)の中性子飛行時間施設GELINAにおいて、核物質の特性を評価するためNRTAの研究開発を行っている。その一環として、過酷事故で発生が予測される粒子状溶融燃料デブリに含まれる核物質の定量にNRTAを適用することを目的とした開発に取り組んできた。その開発の中で、デブリ中の核物質の定量精度が中性子吸収材のボロン($$^{10}$$B)の存在量やデブリのさまざまな形や大きさに強く影響を受けることがわかった。こうしたデブリに特徴的な性質に対処するため、解析手法の改良やモデルの開発を行ってきた。本発表では、開発した解析手法やモデルの妥当性を検討するためGELINAで実施したNRTA実験の結果について報告し、中性子吸収材の存在下においても、NRTAでは2%以下の精度で核分裂性物質の量を導出できることを示す。

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