Novel optical-guiding crystal scintillator composed of an Eu-doped SrI2 core and glass cladding

• Published in: Ceramics international 2023-12, Vol.49 (24), p.41259-41263
• Main Authors: Yajima, Ryuga, Kamada, Kei, Takizawa, Yui, Kutsuzawa, Naoko, Sasaki, Rei, Yoshino, Masao, Horiai, Takahiko, Murakami, Rikito, Kim, Kyoung Jin, Kochurikhin, Vladimir V., Yamaji, Akihiro, Kurosawa, Shunsuke, Yokota, Yuui, Sato, Hiroki, Toyoda, Satoshi, Ohashi, Yuji, Takashi, Hanada, Yoshikawa, Akira
• Format: Article
• Language: English
• Subjects: Eu:SrI2; Nuclear applications; Optical properties; Scintillator
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2022.12.264

Scintillators are used not only as single crystals in radiation detection systems but also as arrays, columns, and fibers. In this study, a novel optical-guiding crystal scintillator (OCS) was fabricated using an Eu:SrI2 crystal as the core and borosilicate glass as the cladding. The OCS has an elongated shape and can be flexibly processed like an optical fiber. Furthermore, because inorganic scintillator crystals are used as the core, the OCS has high sensitivity to high-energy radiation, such as γ- and X-ray radiation, unlike plastic scintillators. In this study, by observing the cross section of the fabricated OCS, identifying the crystal structure, and investigating the radioluminescence spectrum under X-ray irradiation, OCS fabrication in accordance with the OCS design specifications was confirmed, and the SrI2 crystal structure and Eu2+ 5d–4f luminescence were maintained. The γ-ray responses, such as light yield and decay time, were also investigated.