3D imaging using combined neutron-photon fan-beam tomography: A Monte Carlo study

Area of Science:

• Nuclear Physics and Engineering
• Materials Science
• Imaging Science

Background:

• Traditional imaging methods often struggle to differentiate materials based on density alone.
• Neutron and photon interactions with matter provide complementary information for material characterization.
• Combined tomography offers a potential solution for detailed 3D material analysis.

Purpose of the Study:

• To investigate the feasibility of combined neutron-photon tomography for 3D imaging.
• To evaluate the capability of this technique in visualizing object shapes and material compositions.
• To assess the effectiveness of different neutron and X-ray sources in the imaging process.

Main Methods:

• Utilized MCNP5 simulations to model combined neutron-photon tomography.
• Simulated two-dimensional transmission projections for fan-beam scans.
• Employed various neutron sources (2.5 MeV D-D, 14 MeV D-T) and X-ray sources (1 MeV, 6 MeV, 9 MeV).

Main Results:

• Photons provided data on electron and mass density.
• Neutrons yielded information on the product of density and microscopic cross-section.
• The ratio of neutron and photon data allowed for material composition determination.
• Developed imaging technique successfully visualized object shapes and material compositions.

Conclusions:

• Combined neutron-photon tomography is a viable technique for 3D imaging.
• This approach enables simultaneous assessment of object shape, density, and material composition.
• The simulation results demonstrate the potential for advanced material characterization.