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Neutron tomography developments and applications.

W J Richards1, M R Gibbons, K C Shields

  • 1Davis McClellan Nuclear Radiation Center, University of California, 5335 Price Avenue, Building 258, McClellan, CA 95652-2504, USA.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|July 13, 2004
PubMed
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Neutron tomography, a nondestructive testing method, excels at detecting low hydrogen concentrations and verifying component placement. This advanced imaging technique is crucial for 21st-century industrial and research applications.

Area of Science:

  • Nuclear Engineering
  • Materials Science
  • Non-Destructive Testing (NDI)

Background:

  • Neutron radiography has been a key NDI technique for 50 years.
  • Neutrons uniquely image elements and isotopes poorly detected by other methods.
  • Various neutron radiography forms exist, including tomography.

Purpose of the Study:

  • To describe the neutron tomography system at UC Davis/MNRC.
  • To highlight its research and commercial applications.
  • To demonstrate its capability for detecting low hydrogen concentrations.

Main Methods:

  • Development of a neutron tomography system over 4 years.
  • Pre-processing: spatial resolution/noise correction, systematic error/beam hardening correction.
  • Post-processing: image alignment, center of mass determination, filtered back-projection using Donner Algorithms Library.

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Main Results:

  • Successful detection of low hydrogen concentrations (<200 ppm) in metal matrices.
  • Verification of "O-ring" placement in large metal valve bodies in 3D.
  • Mapping of veins in porous and high-density rocks.

Conclusions:

  • Neutron tomography is a valuable tool for detecting low concentrations of hydrogen.
  • The UC Davis/MNRC system effectively verifies component placement and maps internal structures.
  • Neutron tomography is an essential inspection technique for the 21st century.