Comparative study of radiation-induced luminescence between non-doped CsBr transparent ceramic and crystal

Abstract

We synthesized bulk CsBr samples in a transparent ceramic form by spark plasma sintering (SPS) and in a single crystal form by the vertical Bridgman-Stockbarger method, and investigated their optical, scintillation and dosimeter properties. In photoluminescence, scintillation, thermally-stimulated luminescence (TSL) and optically-stimulated luminescence (OSL), the CsBr in both the material forms showed broad emission peaks at around 450 nm, the origin of which was considered to be due to oxygen impurities. The TSL and OSL properties were notably enhanced in the transparent ceramic, in particular. The dosimetric sensitivities were confirmed to be as low as 0.01 mGy using TSL but were 1mGy using OSL for both the transparent ceramic and single crystal forms.