O B A V I J E S T
OM PRAKASH DASH
održat će znanstveni kolokvij (doktorski seminar) iz Nuklearne fizike pod naslovom
Development and characterization of a compact single-plane readout Compton camera
The Compton gamma camera (CGC) has emerged as a versatile tool for gamma-ray imaging in applications ranging from environmental monitoring and homeland security to medical imaging and astrophysics. We present the design and characterization of a novel single-plane, single-side readout CGC that balances efficiency, angular resolution, and portability. The detector has a unique design, that consists of an 8×8 matrix of GAGG:Ce scintillators, where each pixel comprises two 3×3×3 mm³ crystals coupled via a 20 mm plexiglass light guide, enabling scatterer–absorber dual-layer functionality while being read out by a single SiPM array. This configuration reduces readout channels by half compared to dual-plane designs, ensuring compactness and cost-effectiveness. Laboratory measurements with 137Cs source yielded energy resolutions of 8.9 ± 1.9% and 10.8 ± 1.6% at 662 keV for the scatterer and absorber layers, respectively. Imaging tests demonstrated accurate source localization with angular resolution measures of 13–14° (FWHM), validated by both Simple Back Projection (SBP) and Maximum Likelihood Expectation Maximization (MLEM) reconstruction methods. Complementary GEANT4 simulations identified interaction-induced noise contributions, guiding data selection and improving reconstruction fidelity. This works presents for the first time, detailed characerization of detector performance, comparing it to the state-of-the-art and discusses its potential to act as a compact and efficient solution for real-world gamma-ray detection and imaging.
Seminar će se održati u četvrtak, 2. listopada 2025. godine u 9:00 sati u predavaonici F-201 Fizičkog odsjeka Prirodoslovno-matematičkog fakulteta Sveučilišta u Zagrebu.
Pozivaju se studenti doktorskog studija Fizike, smjer Nuklearna fizika, da prisustvuju seminaru, ako nisu spriječeni.
Voditelj smjera:
Prof. dr. sc. Damir Bosnar, v. r.
Pristupačnost
