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Neutron Imaging Using a Fine-Grained Nuclear Emulsion.

Katsuya Hirota1, Tomoko Ariga2, Masahiro Hino3

  • 1Department of Physics, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8602, Japan.

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|August 30, 2021
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Nuclear emulsion detectors offer sub-micron spatial resolution for advanced neutron imaging. This study explores two methods, achieving high-resolution imaging and revealing microstructures with potential for neutron detection applications.

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cold neutronneutron imagingnuclear emulsion

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Area of Science:

  • Nuclear physics
  • Materials science
  • Imaging technology

Background:

  • Nuclear emulsion detectors possess sub-micron spatial resolution.
  • This characteristic presents opportunities for high-resolution neutron imaging applications.

Purpose of the Study:

  • To investigate two distinct approaches for utilizing nuclear emulsion detectors in neutron imaging.
  • To evaluate the performance of these methods in achieving high-resolution imaging and structural analysis.

Main Methods:

  • Employing track analysis of neutron interactions within the emulsion to determine reaction points with high precision.
  • Utilizing image analysis on emulsion data from high-density irradiation without track analysis.

Main Results:

  • Achieved a periodic peak with a 1.3 μm standard deviation using a 9 μm pitch Gd grating and cold neutrons, demonstrating high-resolution capabilities.
  • Successfully observed the internal structure of a crystal oscillator chip (approx. 30 μm scale) using image analysis on emulsion data.

Conclusions:

  • Nuclear emulsion detectors are effective for high-resolution neutron imaging.
  • Two distinct methodologies, track analysis and direct image analysis, offer versatile approaches for neutron imaging with emulsion detectors.