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Nuclear Fission02:50

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Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large number of different...
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Neutron phase imaging by a Talbot-Lau interferometer at Kyoto University Reactor.

Yoshichika Seki1, Takenao Shinohara2, Masahiro Hino3

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.

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A new neutron phase imaging system was developed for medium-sized reactors, enabling detailed defect analysis in materials like Inconel 718 using differential-phase and visibility imaging.

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Area of Science:

  • Neutron optics
  • Materials science
  • Interferometry

Background:

  • Neutron phase imaging offers unique capabilities for non-destructive material analysis.
  • Talbot-Lau interferometers are crucial for advanced neutron imaging techniques.
  • Medium-sized neutron sources require optimized imaging systems for practical applications.

Purpose of the Study:

  • To develop and implement a novel neutron phase imaging system at the Kyoto University Reactor's CN-3 port.
  • To enable efficient differential-phase and visibility (dark-field) imaging using thermal neutrons.
  • To demonstrate the system's capability for analyzing defects in additively manufactured materials.

Main Methods:

  • Utilized a Talbot-Lau interferometer with a shorter design wavelength (2.7 Å) for enhanced imaging.
  • Fabricated neutron absorption gratings using thick gadolinium for high-visibility moiré fringes (55% visibility).
  • Applied differential-phase and visibility imaging to Inconel 718 rods, followed by tomography.

Main Results:

  • Achieved clear moiré fringes with high visibility using the developed grating system.
  • Successfully visualized defect size variations in Inconel 718 rods after hot isostatic pressing.
  • Revealed sub-micrometer scale spatial distribution of defects through neutron tomography.

Conclusions:

  • The new neutron phase imaging system is effective for analyzing defects in additively manufactured materials.
  • The system's design is suitable for utilization at medium-sized neutron sources.
  • High-visibility gratings and advanced imaging techniques enable detailed material characterization.