[12p-S202-1~21] 2.5 Radiation-induced phosphors

▲ [12p-S202-14] Pr concentration dependence of scintillation properties on Pr-doped La₂Si₂O₇ crystal

〇(D)Prom Kantuptim¹, Daisuke Nakauchi¹, Takumi Kato¹, Noriaki Kawaguchi¹, Takayuki Yanagida¹ (1.NAIST)

Keywords:scintillator, Pr3+, lanthanum pyrosilicate

Scintillator is a luminescence material which can convert a high energy photon and a particle of the ionizing radiation to the lower energy photons such as ultraviolet and visible light immediately after the absorption of the ionizing radiation. The emitted photons are collected by photodetectors and converted to electrical signals for radiation detection purpose. At present, the single crystal type scintillators using the rare earth ions as the luminescence center have been commonly investigated from a fast response time, high light yield, and high effective atomic number. Among luminescence center ions, Pr³⁺ is one of the highly attractive ions for this purpose from the result of fast scintillation decay time. In 2018, the Pr-doped Lu₂Si₂O₇ study had shown a very fast scintillation decay time around 15 ns with a light yield of 9,700 ph/MeV [1].
Form these great results, the searching of new host materials for Pr is becoming very interesting for the fast decay time scintillator. From the similar ionic radius between Lu and La, the lanthanum pyrosilicate (La₂Si₂O₇, LaPS) is expected to has high scintillation characteristics when doped with the Pr. This study has an aim to be the first report on Pr-doped LaPS focus on both optical and scintillation properties. This work is also covered the other properties including PL emission spectra and decay time, X-ray induced scintillation spectra and decay time, afterglow analysis, γ-ray pulse height, and more.