Scintillation Properties of Eu:CaS Transparent Ceramicsfor Radiation Imaging Applications

CaS transparent ceramics doped with various concentrations of Eu (0.01, 0.05, 0.1, and 0.5%) were synthesized by the spark plasma sintering method, and their structural, optical, and X-rayinduced scintillation properties were evaluated.The ceramics exhibited high transmittance (~80%) with absorption bands corresponding to the 4f-5d transitions of Eu 2+ ions at 300-350 nm and 400-600 nm.Under UV and X-ray excitation, a broad emission peak at around 650 nm was observed, which would be due to the 5d-4f transitions of Eu 2+ ions.The practical applicability of the 0.05% Eu-doped CaS transparent ceramic was demonstrated through X-ray imaging of electronic components.The X-ray imaging system achieved a spatial resolution of at least 0.15 mm.