Speaker
Description
High-energy gamma-ray imaging is essential in non-destructive testing and gamma beam diagnostics applications. To enhance spatial resolution and detection efficiency, structured scintillators have been developed, offering superior image quality compared to traditional monolithic scintillators. While structured scintillators have been extensively studied for X-ray detection, their response to high-energy photons remains unexplored. In this work, we investigate the performance of pixelated scintillator detector panels for high-energy gamma imaging through GEANT4 Monte Carlo simulations. Various scintillator materials were analyzed, including CsI(Tl), LYSO, and BGO, of thicknesses ranging from 0.5 to 2 mm. The optimization process focused on evaluating the deposited energy, the absorption efficiency, and the spatial energy distribution for incident gamma-ray energies between 0.1 and 10 MeV. Pixel size optimization for maximizing the spatial resolution was performed using the modulation transfer function (MTF). In addition, we present a comparative testing of a plain scintillator and a columnar (nanostructured) scintillator, assessing their imaging performance. The results highlight the potential of pixelated scintillators for high-resolution gamma imaging and provide insights into optimizing detector design for advanced gamma-ray applications.
