Speaker
Description
Retrospective dosimetry requires readily available materials with reliable luminescent responses to ionizing radiation when personal dosimeters are absent. Preliminary studies (Łepkowska and Jung, 2024, 2022; Fattibene et al., 2022) have highlighted the potential of mobile phone glass for retrospective dosimetry. However, a systematic investigation is still needed to establish a comprehensive database of glass samples analyzed using thermally stimulated luminescence (TL), electron paramagnetic resonance (EPR), and chemical element analysis. The creation of such a database will support the development of robust protocols for retrospective dose assessment and is the central objective of the RetroGlass Project, a joint scientific initiative between Poland and Austria.
Two complementary studies (Klimecka, 2026; Piwowarska, 2026) evaluated smartphone display glass as an emergency dosimeter using TL, focusing on linearity, repeatability, and signal stability across 46 screens from various phone models. Both studies employed Sr-90/Y-90 irradiation and linear heating to 400°C, coupled with mass normalization and background subtraction, establishing standardized protocols for multi-step assessment of dose-response, repeatability, and time-dependent fading.
Across all models, TL signal versus dose displayed excellent linearity, enabling robust calibration in the 0.5-3 Gy range. A shape-stability metric based on the FWHM of glow peaks, computed after Savitzky-Golay filtering showed high repeatability. Normalization of glow curves to unity did not materially affect FWHM or repeatability, underscoring the robustness of shape-based dosimetric characterization. Time-dependent fading varied by model and was primarily governed by peak temperature; low-temperature peaks exhibited more pronounced decay, impacting curve shape and FWHM and thus dose reconstruction accuracy if not controlled. The intrinsic signal, which is likely linked to manufacturing UV exposure, varied by model and can confound low-dose estimation.
Together, these results demonstrate that smartphone display glass supports rapid and reproducible TL dosimetry for triage-level dose assessment, ready for standardization and deployment in radiological emergencies.