Yusuke Endo, Kensei Ichiba, D. Nakauchi, Takumi Kato, N. Kawaguchi, Takayuki Yanagida
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Development of Tm-doped CaHfO3 single-crystal-scintillators for application to integrated-type detectors
Photoluminescence and scintillation properties of Tm:CaHfO3 single crystals were investigated. From the results of photoluminescence properties, all the Tm:CaHfO3 samples showed emission bands due to the 4f–4f transitions of Tm3+, and the 1.0% Tm:CaHfO3 sample showed the highest quantum yield among all the samples upon excitation at 360 nm. The afterglow levels at 20 ms after X-ray irradiation for 2 ms were approximately 12,000 ppm. Pulse height spectra using 137Cs as γ-ray source revealed the 1.0% Tm:CaHfO3 sample showed the highest light yield of 1,250 photons/MeV among all the samples.
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