Neutron resonance absorption imaging fully utilizing neutron energies from 1 eV to 100 keV

Area of Science:

• Nuclear Physics
• Materials Science
• Analytical Chemistry

Background:

• Neutron resonance absorption imaging is crucial for materials analysis.
• Accurate elemental distribution mapping is essential for understanding material composition and impurities.
• Existing techniques face challenges with overlapping materials.

Purpose of the Study:

• To develop and validate an advanced neutron resonance absorption imaging technique.
• To enhance element discrimination and visualization capabilities.
• To overcome limitations of current methods in complex material samples.

Main Methods:

• Neutron transmission spectra measurement from 1 eV to 100 keV.
• Sample rotation for 2D distribution analysis.
• Analysis using single, multiple, and a novel wide-range fitting method for resonance peaks.

Main Results:

• Clear visualization of hafnium and molybdenum distributions using prominent resonances.
• Improved accuracy and clarity for iron, nickel, zirconium, and molybdenum with multi-resonance analysis.
• Successful visualization of sample metals and impurities (hafnium, manganese) using a novel fitting method, overcoming overlapping material challenges.

Conclusions:

• The developed neutron resonance absorption imaging technique provides accurate elemental discrimination.
• The novel wide-range fitting method effectively handles overlapping material resonances.
• This technique will establish a standard analytical procedure for facility users, advancing materials characterization.