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論文

Delayed gamma-ray analysis for characterization of fissile nuclear materials

小泉 光生; Rossi, F.; Rodriguez, D.; 高峰 潤; 瀬谷 道夫; Bogucarska, T.*; Crochemore, J.-M.*; Varasano, G.*; Abbas, K.*; Pedersen, B.*; et al.

EUR-28795-EN (Internet), p.868 - 872, 2017/00

Under the collaboration between the Japan Atomic Energy Agency (JAEA) and European Commissions' Joint Research Center (EC-JRC), development of four active neutron-interrogation non-destructive assay methods for nuclear non-proliferation and safeguards are in progress. The techniques are differential die-away analysis, delayed gamma-ray analysis (DGA), neutron resonance transmission analysis, and prompt gamma-ray analysis. Information obtained by each method is used complementarily to characterize a sample. DGA utilizes moderated pulsed neutrons from a D-T neutron generator to induce fission reaction of nuclear materials. Delayed gamma rays from the fission products (FP) are measured to determine the ratios of fissile nuclides (e.g. $$^{235}$$U, and $$^{239,241}$$Pu) in the sample. Experimental studies of the DGA method are in progress with the Pulsed Neutron Interrogation Test Assembly (PUNITA) in EC-JRC Ispra. Here we present an overview of the study plan of these DGA experiments along with the latest results. This research was implemented under the subsidiary for nuclear security promotion of MEXT.

論文

A Note on the diven factor in fast systems

岡嶋 成晃; 山根 義宏*; 竹本 吉成*; 桜井 健

Journal of Nuclear Science and Technology, 37(8), p.720 - 723, 2000/08

Diven因子の入射中性子エネルギー依存性を調べた結果、高速炉系におけるDiven因子の適用には、入射中性子エネルギーを考慮する必要があることがわかった。また、高速炉系のように、複数の核種が核分裂に寄与するような体系のDiven因子の式を導出した。

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