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neutron transmission imaging with a portable D-T neutron generator

Radiation Detection Technology and Methods 2022年第2期6卷 234-243页

作者： Phillip Kerr Nerine Cherepy Jennifer Church Gary Guethlein Jim Hall Colby McNamee Sean o'Neal Kyle Champley Andy Townsend Mayuki Sasagawa Anthony Hardy Saphon Hok Lawrence Livermore National Laboratory LivermoreCA 94550USA

Purpose A portable fast-neutron imaging system is being developed to provide complementary information to field X-ray imaging.Applications include inspection of vehicles and infrastructure for corrosion,measurement of material levels in containers,and inspection of munitions and suspicious packages.While fast-neuron imaging generally provides lower imaging resolution compared to X-rays,fast-neutron interaction cross-sections have a weak dependence on material Z.This enables imaging of low-Z materials inside high-Z materials.Here,we discuss the limitations and current improvements in fast-neuron imaging.Methods Limitations in portable fast-neutron imaging systems include low D-T neutron generator output,low light pro-duction in ZnS(Cu)imaging scintillators,low resolution due to scintillator thickness and D-T spot size,and digital-panel darknoise that varies in time and position and that can be 100×larger than the neutron signal.We have made improvements in these areas through development of a segmented high light yield scintillator,panel noise mitigation techniques,and testing of new high-output,small spot size D-T neutron generators.Results The segmented high light yield fast-neutron scintillator demonstrated 5×increase in light compared to ZnS(Cu).An additional 2×improvement in signal-to-noise was demonstrated with panel-noise mitigation techniques.Our MCNP calculations also show good agreement with neutron imaging results Conclusions We have demonstrated improvements in fast-neutron imaging through development of a segmented high light yield neutron scintillator,mitigation of digital panel noise,and preliminary testing with new high-output,small spot size D-T neutron generators.We have also demonstrated good results modeling fast-neutron images and scatter effects using MCNP.

关键词： Fast-neutron radiography portable neutron imaging neutron scintillators Monte Carlo simulation

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