Scintillation and dosimetric properties of Tb₄O₇-doped Ca₂BO₃Cl

We synthesized calcium borate chlorides (Ca₂BO₃Cl) with different amounts of Tb₄O₇ (0.1, 0.5, 1.0%), and investigated photoluminescence, scintillation, and dosimetric characteristics. Photoluminescence and scintillation owing to the electronic transition between 4f levels of Tb³⁺ were observed, and the 0.1% Tb₄O₇-doped Ca₂BO₃Cl exhibited the highest intensity. Further, thermal stimulated luminescence (TSL) glow peaks appeared at approximately 90, 140, and 340 °C from the fabricated Ca₂BO₃Cl, and the 0.1% Tb₄O₇-doped Ca₂BO₃Cl with the largest glow peak intensity exhibited a dose response in the 10–10000 mGy range. Moreover, the fabricated Ca₂BO₃Cl showed optical stimulated luminescence (OSL) owing to the electronic transition between 4f levels of Tb³⁺, and three OSL exponential decay components were detected from the fabricated Ca₂BO₃Cl, suggesting the presence of at least three detrapping processes for OSL.