Thermal properties of a fiber-optic radiation sensor for measuring gamma-rays in high-temperature conditions

• Published in: Journal of the Korean Physical Society Vol. 66; no. 1; pp. 46 - 50
• Main Authors: Jeon, Dayeong, Yoo, Wook Jae, Shin, Sang Hun, Hong, Seunghan, Sim, Hyeok In, Kim, Seon Geun, Jang, Jae Seok, Jang, Kyoung Won, Lee, Bongsoo, Park, Byung Gi, Moon, Joo Hyun
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 2015; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; Fiber-optic radiation sensor; Gamma-ray spectroscopy; Temperature; LYSO; Thermoluminescence
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.66.46

A fiber-optic radiation sensor (FORS) was fabricated using a cerium-doped silicate-yttriumlutetium (LYSO:Ce) scintillator crystal and a silica optical fiber (SOF) to measure gamma-rays accurately in elevated temperature conditions. Throughout this study, a LYSO:Ce crystal was employed as a sensing material of the FORS due to its high light yield (32,000 photons/MeV), fast decay time (≤ 47 ns) and high detection efficiency. Although the LYSO:Ce crystal has many desirable qualities, the thermoluminescence (TL) should be eliminated by using a heat annealing process because the light yield of the LYSO:Ce crystal varies with its TL. In this study, therefore, we obtained the TL curve of the LYSO:Ce crystal by increasing the temperature up to 280 ℃, and we demonstrated that almost all of the TL of the LYSO:Ce crystal was eliminated by the heat annealing process.