Research Information System
Radiation Physics and Chemistry, vol.243, 2026 (SCI-Expanded, Scopus)
This study examines the feasibility of using a large single scintillator with conventional photomultiplier tubes for muon tomography applications. The performance in reconstructing muon beam interaction positions on a large scintillator using Anger logic with both linear and logarithmic weights, as well as a new mathematical model, is presented. A 50cm×50cm scintillator with a 2×2 array of small PMTs for light readout was configured in the Geant4 simulation program. Various surface finishing models and detector design parameters, such as scintillator thickness, surface roughness, and air gap thickness, were tested to evaluate their impact on position resolution. A new logarithmic weight was introduced to characterize the true interaction position using a Gaussian fit. The log-likelihood method was applied to the reconstructed position distributions using both linear and logarithmic weights. The bias related to the true interaction position at the center of the reconstructed position distributions was corrected at the expense of position resolution. The beam interaction position resolution was mapped relative to the true interaction position using both weighting methods. Finally, significant improvements in position resolution across the entire scintillator surface were achieved through mathematical modeling that accounted for the scattering effects of scintillation photons. With the developed model, a position resolution of approximately 8 mm rms near the center of the scintillator was achieved using only four PMTs with a diameter of 2.5 cm.