Thickness optimization of granular phosphor scintillators for use in low activity ionizing radiation spectrometers: the Gd2O2S:Tb theoretical paradigmN. Kalyvas, C. Michail, S. Tseremoglou, E. Karali, I. Valais, G. Fountos and I. KandarakisEur. Phys. J. Spec. Top., (2025) 1-8DOI: https://doi.org/10.1140/epjs/s11734-025-01471-9