PSI - Issue 79

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ScienceDirect

Procedia Structural Integrity 79 (2026) 138–145

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of IGF28 - MedFract3 organizers Abstract The light output (luminescence efficiency-LE) of three Cerium-doped single crystal scintillators under X-ray excitation was evaluated in the influence of external heating. The examined samples were the Lutetium Oxyorthosilicate (Lu 2 SiO 5 :Ce-LSO:Ce), the Lutetium-Yttrium Oxyorthosilicate ((Lu,Y) 2 SiO 5 :Ce or LYSO:Ce) and the Gadolinium Orthosilicate (Gd ₂ SiO ₅ :Ce or GSO:Ce). The crystals were irradiated, with an X-ray medical source (CPI/CMP/200/DR), using a 90 kVp X-ray spectrum. The temperature in each crystal surface was elevated from ambient (i.e. 18-25 o C) to a maximum of 171 o C. The luminescence efficiency of all Oxyorthosilicates was found to decrease constantly with increasing temperature. The luminescence efficiencies of LYSO:Ce and LSO:Ce crystals decreased by 51.76% and 67.98%, respectively with increasing temperature, in the examined range. The LE of GSO:Ce crystal decreased by 25.33% exhibiting greater thermal stability in terms of its luminescence performance for applications requiring stable performance in warmer environmental temperature conditions. 28th International Conference on Fracture and Structural Integrity - 3rd Mediterranean Conference on Fracture and Structural Integrity Assessment of the X-ray Luminescence Efficiency of Cerium-doped Lutetium-Yttrium Oxyorthosilicate (LYSO:Ce) Single Crystal upon Temperature George Papageorgiou, Vasiliki Beskou, Marios Kyriakopoulos, Ioannis Valais, Nektarios Kalyvas, George Fountos, Ioannis Kandarakis and Christos Michail* Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Agiou Spyridonos, Athens 12210, Greece

* Corresponding author. E-mail address: cmichail@uniwa.gr

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of IGF28 - MedFract3 organizers 10.1016/j.prostr.2025.12.317