Faculty of Physics - University of Bucharest

UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

Guest
2024-11-22 1:21

HOME CONFERENCES SEARCH LOGIN NEW USER IMAGES

Conference: Bucharest University Faculty of Physics 2024 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Pixelated scintillators for high-energy gamma imaging

Authors:

Raluca-Andreea MIRON (1,2), Violeta IANCU (2), Gabriel V. TURTURICĂ (2)

Affiliation:

1) Faculty of Physics, University of Bucharest, POBox MG-11, Bucharest-Magurele, Romania

2) Extreme Light Infrastructure – Nuclear Physics, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Magurele, Romania

E-mail

raluca.miron@eli-np.ro

Keywords:

pixelated scintillators, Geant4 simulations, spatial resolution

Abstract:

Structured scintillators have been developed to meet the demand for enhanced visibility of finer details across a wide range of applications, including gamma beam diagnostics and radiography. These advanced materials offer improved detection efficiency, enhanced spatial resolution and overall superior image quality compared to classical scintillators. While numerous studies have explored the use of patterned scintillators for low-energy X-ray detection, their response to high-energy photons remains unexplored. In this work, GEANT4 Monte Carlo simulations were performed to investigate the response of various scintillator detector panels to gamma radiation and optimize a pixelated structure. These panels varied in thickness between 0.5 and 2 mm and were made of different scintillator materials, including CsI(Tl), LYSO and BGO. Here we present and discuss the dependence of deposited energy, spatial distribution of energy deposition and the absorbtion efficiency for incident beam energies ranging from 0.1 to 10 MeV. The optimization of the pixel size was done by analyzing the spatial distribution of deposited energy and the modulation transfer function. After optimizing the pixel parameters, pixelated panels were simulated and evaluated for spatial resolution using the modulation transfer function metric. Additionally, we will discuss laboratory testing that evaluated the performance of two scintillators - a plain scintillator and a columnar (nanostructured) scintillator - using a gamma beam profiler setup.