Speaker
Summary
Segmented high-purity germanium (HPGe) detectors combine excellent energy resolution with position sensitivity, enabling high-quality Compton imaging. We evaluate single-module Compton imaging using a planar segmented HPGe detector by reconstructing two-site (Fold-2) events with signal-comparison pulse-shape analysis (PSA). GEANT4 was used to generate Fold-2 events from a Cs-137 point source at a 10 cm standoff, and a physics-based Solid-State Detector model produced a database of unit-energy superpulses spanning the active volume. For each event, an adaptive grid search over relative drift-time offsets aligns two candidate templates, and constrained least squares returns the energy weights and two interaction positions. These positions are used for analytical back-projection of Compton cones. The reconstructed image shows a compact hotspot with FWHM 47.77 ± 0.98 mm on axis; at x = −100 mm the FWHM broadens to 52.83 ± 2.34 mm with slight asymmetry, consistent with solid-angle and kinematic-acceptance effects. These results demonstrate feasible single-module Compton imaging with a planar segmented HPGe detector. Adding a thin scatter layer is expected to increase imageable events and improve angular resolution.
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