[8a-A201-1~8] 15.1 Bulk crystal growth

[8a-A201-4] Crystal growth and scintillation properties of Ca(Br_xI_1-x)₂ solid solution

〇Yuki Furuya^1,2, Kei Kamada^2,3, Masao Yoshino^1,2, Takashi Iida⁴, Shoki Hayasaka², Akihiro Yamaji¹, Shunsuke Kurosawa^3,5, Yasuhiro Shoji^1,2, Yuui Yokota³, Yuji Ohashi³, Akira Yoshikawa^1,2,3 (1.IMR, Tohoku Univ., 2.C&A Corp., 3.NICHe, Tohoku Univ., 4.Tsukuba Univ., 5.Yamagata Univ.)

Keywords:scintillator, solid solution, halide

Although the CaI₂ crystal has excellent scintillator characteristics such as light yield of 107000 pho ton/MeV and an energy resolution of 3.2% @ 662keV, it has a strong cleavage property on the C face and processing is extremely difficult.
In order to investigate the crystal composition containing Ca and excellent workability, crystal preparation, crystal structure analysis and scintillator characteristic evaluation were carried out in a Ca (Br_xI_1-x) ₂ type solid solution. Ca (Br _x I _1-x) ₂ solid solutions (x = 0.25, 0.5, 0.75) were prepared and the light yield of 71300 photon / MeV and the energy resolution of 7.9% ~ 662 keV were confirmed in the 2% Eu-doped CaBrI crystal.