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Neutron Imaging Using a Fine-Grained Nuclear Emulsion. 2021

Katsuya Hirota, and Tomoko Ariga, and Masahiro Hino, and Go Ichikawa, and Shinsuke Kawasaki, and Masaaki Kitaguchi, and Kenji Mishima, and Naoto Muto, and Naotaka Naganawa, and Hirohiko M Shimizu
Department of Physics, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8602, Japan.

A neutron detector using a fine-grained nuclear emulsion has a sub-micron spatial resolution and thus has potential to be applied as high-resolution neutron imaging. In this paper, we present two approaches to applying the emulsion detectors for neutron imaging. One is using a track analysis to derive the reaction points for high resolution. From an image obtained with a 9 μm pitch Gd grating with cold neutrons, periodic peak with a standard deviation of 1.3 μm was observed. The other is an approach without a track analysis for high-density irradiation. An internal structure of a crystal oscillator chip, with a scale of approximately 30 μm, was able to be observed after an image analysis.

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