[18p-D419-1~9] 2.5 Radiation-induced phosphors

▲ [18p-D419-6] Scintillation Properties of Tb-doped Gadolinium Pyrosilicate Crystal

〇(DC)Prom Kantuptim¹, Takumi Kato¹, Daisuke Nakauchi¹, Noriaki Kawaguchi¹, Kenichi Watanabe², Takayuki Yanagida¹ (1.NAIST, 2.Kyushu Univ.)

Keywords:scintillator, Tb3+, single crystal

The scintillator is one of the phosphor materials that can convert the high-energy ionizing radiations such as photons (X- or γ-ray), neutron, or charged particles into lower-energy photons such as ultraviolet (UV), visible, and near-infrared light. The combination of scintillator and photodetector has been widely used for radiation detection systems in many scientific fields. In 2003, the Ce-doped Lu₂Si₂O₇ (LPS) study presented a high light yield of 26,300 ph/MeV with a fast decay time of 36 ns. For the luminescence canter_, Tb³⁺ is famous for the green emission of 4f-4f transitions. However, in the past, the study of scintillation properties of Tb³⁺ scintillator was difficult due to the limitation of the instrument setup. Until recently, the pulse height system for the scintillator with millisecond decay time has been successfully developed. This study is focused on the combination of Tb³⁺ with the gadolinium pyrosilicate, Gd₂Si₂O₇ (GPS). The Tb-doped concentration dependence on both photoluminescence and scintillation properties is focused.