Neutron resonance spectroscopy for the characterization of materials and objects

中性子共鳴パラメータ

Schillebeeckx, P.*; Becker, B.*; 原田 秀郎   ; Kopecky, S.*

Schillebeeckx, P.*; Becker, B.*; Harada, Hideo; Kopecky, S.*

中性子と原子核が反応する確率は、入射中性子のエネルギーに大きく依存し、多くの原子核で中性子共鳴が現れる。この性質を利用した非破壊分析法として、中性子共鳴透過分析法と中性子共鳴捕獲線分光法がある。本報告では、各分析法の原理を解説すると共に、両手法の利点を組み合わせた新たな非破壊分析法として開発を進めている中性子共鳴濃度分析法について解説する。

The probability that neutrons interact with nuclei strongly depends on the energy of the incoming neutron. There are resonances at specific energies for each nuclide.Since resonances appear at energies that are specific for each nuclide, they can be used to determine the elemental and in some cases even the isotopic composition of materials and objects. The resonance structures in total and capture cross sections are the basis of Neutron Resonance Transmission Analysis (NRTA) and Neutron Resonance Capture Analysis (NRCA), respectively. Principles of NRTA and NRCA are reviewed. Neutron Resonance Densitometry (NRD) combining NRTA and NTCA is also reviewed as a non-destructive method to characterize particle-like debris of melted fuel.