Abstract
In this study, Tl-doped NaI transparent ceramics with varying doping concentrations (0.05, 0.1, 0.3, and 0.5%) were synthesized using the spark plasma sintering (SPS) method, and We investigated the optical and scintillation properties. In terms of optical properties, the 0.1% Tl-doped NaI sample showed the diffuse transmittance of ∼70% in the visible range. The photoluminescence peak was observed at around 420 nm with the decay time of approximately 150 ns. The scintillation peak was also observed at 420 nm due to 3P1→1S0 transition of Tl+. In addition, all the samples showed the scintillation peak at 330 nm due to self-trapped exciton. Among all the samples, the 0.1% Tl-doped NaI sample showed the highest light yield (36,000 ph/MeV) under 137Cs γ-ray irradiation, and this value is almost equivalent to that of Tl-doped NaI single crystals (38,000 ph/MeV).
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