PSI - Issue 79

George Papageorgiou et al. / Procedia Structural Integrity 79 (2026) 138–145

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Fig. 6. Comparative luminescence performance of the three examined samples in the temperature range 16-171 ο C.

4. Conclusions Three Cerium-doped, single crystal scintillators, often employed in medical detectors (LSO:Ce, LYSO:Ce and GSO:Ce) were irradiated under 90 kVp X-rays, in the thermal range 16-171 o C. The two Lutetium based LSO:Ce and LYSO:Ce crystals showed a similar efficiency drop off trend, however LSO:Ce had higher luminescence efficiency values across the examined range. The Gadolinium based crystal (GSO:Ce), which is known to have significantly lower light yield values, appeared more resilient to thermal exposure. For temperatures higher than 88 o C, GSO:Ce showed higher LE values than LYSO:Ce. For temperatures reaching 150 o C the luminescence efficiency of GSO:Ce approached the values of LSO:Ce. This finding is useful for cost-effective imaging applications where the detector will operate at higher temperatures. Acknowledgements The joint 28 th International Conference on Fracture and Structural Integrity, 3rd Mediterranean Conference on Fracture and Structural Integrity, September 15-18, 2025, Catania (Italy) & Web publication fees were funded by the University of West Attica, Greece.