Ki-Tek HAN¹, Wook Jae YOO¹, Jeong Ki SEO¹, Sang Hun SHIN¹, Dayeong JEON¹, Seunghan HONG¹, Seunghyun CHO², Joo Hyun MOON³, and Bongsoo LEE^1*

¹School of Biomedical Engineering, College of Biomedical and Health Science, Research Institute of Biomedical Engineering, Konkuk University, Chungju 380-701, Korea
²Department of Organic Materials and Fiber Engineering, College of Engineering, Soongsil University, Seoul 156-743, Korea
³Department of Nuclear and Energy Engineering, College of Energy and Environment, Dongguk University, Gyeongju 780-714, Korea

(Received August 23, 2012; Revised November 14, 2012; Accepted November 16, 2012)

A fiber-optic radiation sensor (FORS), which is composed of an inorganic scintillator, a plastic optical fiber (POF), a photomultiplier tube (PMT), and a multichannel analyzer (MCA), was developed for gamma-ray energy spectroscopy. In this study, we selected a cerium-doped lutetium yttrium orthosilicate (LYSO:Ce) as the sensitive element of the FORS and found that LYSO:Ce with dimensions of 3× 3× 15 mm³ gives the best performance in obtaining a gamma-ray energy spectrum. The FORS allows us to measure the energy spectra of Co-60, Na-22, and Cs-137.

Key words: fiber-optic radiation sensor, gamma spectroscopy, multichannel analyzer, scintillator

^*E-mail address: bslee@kku.ac.kr