PSI - Issue 47

Dionysios Linardatos et al. / Procedia Structural Integrity 47 (2023) 80–86 Linardatos/ Structural Integrity Procedia 00 (2023) 000 – 000

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to avoid melting of the various components of the experimental setup (Pokluda et al., 2015). The drop in the emission performance of both CeBr 3 and CaF 2 :Eu (from 37.94 EU at temperature of 26 o C to 9.73 E.U. at 155 o C), due to thermal quenching, is similar with the majority of the examined crystals (Melcher et al., 1991). Both crystals ’ maximum signal was observed at the lowest examined temperature (37.94 EU at 26 ° C for CeBr 3 and 22.01 EU for CaF 2 :Eu at 22 ° C). The signal decrease for CeBr 3 is more evident in the temperature range 26 °C -31 ° C, whereas for higher temperatures the luminescence signal decreases at a slower rate (31.59 EU at 31 °C to 14.038 EU at 72 ° C). For even higher temperatures, the signal changes only slightly from 12.73 EU at 79 ° C to 9.73 EU at 155 ° C. The inherent properties of CeBr 3 justify the superior performance compared to CaF 2 :Eu.

Fig. 5. Variation of CeBr 3 and CaF 2 :Eu luminescence signal with temperature.

4. Conclusions The luminescence light signal output of a CeBr 3 scintillator under the influence of different environmental temperatures was assessed. The results for CeBr 3 were studied against a previously examined CaF 2 :Eu single crystal of equal dimensions. The CeBr 3 crystal sample was examined under an X-ray flux to assess the luminescence efficiency and was measured within temperatures from 26 °C to 155 ° C. The luminescence outputs of CeBr 3 and CaF 2 :Eu showed 74% and 79% decrease, respectively, from the initial temperature to the upper temperature limit that was examined. Data on the thermal luminescence output of the scintillator can be useful upon the integration of the crystals into detector modules for applications where the temperature affects the performance of the imaging system.

Acknowledgments The 27th International Conference on Fracture and Structural Integrity February 22-24, 2023, Rome (Italy) & Web publication fees were funded by the University of West Attica, Greece.