RPL properties of samarium-doped CaSO4. (2nd February 2022)

• Record Type: Journal Article
• Authors: Okada, Go; Shinozaki, Wakako; Ueno, Satoshi; Koguchi, Yasuhiro; Hirasawa, Kazuki; d'Errico, Francesco; Yanagida, Takayuki; Kasap, Safa; Nanto, Hidehito
• Is Part Of: Japanese journal of applied physics. Volume 61:Number SB(2022)
• Publication Date: 2022-02-02
• Subjects: radiophotoluminescence -- RPL -- samarium -- CaSO4; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ac1ab2
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Radiophotoluminescence (RPL) properties of Sm-doped CaSO4 for radiation dosimetry applications are reported. The samples with varying Sm concentrations are prepared via the solid-state reaction process. The as-prepared samples show photoluminescence due to typical 4f–f transitions of Sm 3+ whereas, after X-ray irradiation, additional emission features appear with a broad band peaking at 630 nm as well as a set of multiple sharp lines across 680–820 nm, which are attributed to the 5d–4f and 4f–4f transitions of Sm 2+, respectively. Therefore, the RPL in the present material system relies on the generation of Sm 2+ centers. The sensitivity is about 3 times lower than that of Ag-doped phosphate glass, but no fading and build-up of signal are evident even immediately after the irradiation. The signal is reversible by heat-treatment at 500 °C, and is reproducible even after the thermal erasure, especially when the differential signal between pre- and post-irradiation is taken into account.