Journal
CRYSTALS
Volume 10, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/cryst10121073
Keywords
GaGG; silicon photomultiplier; positron emission tomography; compton imaging; gamma polarization; TOFPET2
Funding
- Research Cooperability Program of the Croatian Science Foundation - European Union from the European Social Fund under the Operational Programme Efficient Human Resources 2014-2020 [PZS-2019-02-5829]
- EU STRONG-2020 project [824093]
- International Atomic Energy Agency [CRP F22069]
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We investigated two detector modules, each consisting of a 8 x 8 matrix of GaGG:Ce crystals with a crystal size of 3 x 3 x 20 mm3 and a 3.2 mm pitch. The light is collected by a 8 x 8 silicon photomultiplier array, with one silicon photomultiplier matching one crystal. The signals are read out and processed using the TOFPET2 ASIC. Performed laboratory tests of the detectors were performed using a 22Na source, where energy and coincidence time resolution with different optical coupling were examined between the crystals and silicon photomultipliers, as well as under various operating voltages. The mean energy resolution of 9.8 +/- 0.6% at 511 keV was observed and it was shown that the coincidence time resolution of 384 +/- 33 ps could be achieved. The results reassure that the GaGG scintillator is a very promising candidate for the development of imaging systems, in particular, ones utilizing Compton scattering where the energy resolution plays a critical role and a moderate timing performance is acceptable.
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