title: Measurement of Cerenkov radiation induced by the gamma-rays of Co-60 therapy units using wavelength shifting fiber.
abstract: In this study, a wavelength shifting fiber that shifts ultra-violet and blue light to green light was employed as a sensor probe of a fiber-optic Cerenkov radiation sensor. In order to characterize Cerenkov radiation generated in the developed wavelength shifting fiber and a plastic optical fiber, spectra and intensities of Cerenkov radiation were measured with a spectrometer. The spectral peaks of light outputs from the wavelength shifting fiber and the plastic optical fiber were measured at wavelengths of 500 and 510 nm, respectively, and the intensity of transmitted light output of the wavelength shifting fiber was 22.2 times higher than that of the plastic optical fiber. Also, electron fluxes and total energy depositions of gamma-ray beams generated from a Co-60 therapy unit were calculated according to water depths using the Monte Carlo N-particle transport code. The relationship between the fluxes of electrons over the Cerenkov threshold energy and the energy depositions of gamma-ray beams from the Co-60 unit is a near-identity function. Finally, percentage depth doses for the gamma-ray beams were obtained using the fiber-optic Cerenkov radiation sensor, and the results were compared with those obtained by an ionization chamber. The average dose difference between the results of the fiber-optic Cerenkov radiation sensor and those of the ionization chamber was about 2.09%.
authors.affiliation: School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University, 268 Chungwon-daero, Chungju-si, Chungcheongbuk-do 380-701, Korea. kko988@hotmail.com.
authors.forename: Kyoung Won
authors.initials: KW
authors.lastname: Jang
authors.affiliation: School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University, 268 Chungwon-daero, Chungju-si, Chungcheongbuk-do 380-701, Korea. shshin9431@gmail.com.
authors.forename: Sang Hun
authors.initials: SH
authors.lastname: Shin
authors.affiliation: School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University, 268 Chungwon-daero, Chungju-si, Chungcheongbuk-do 380-701, Korea. chokomilkys@gmail.com.
authors.forename: Seon Geun
authors.initials: SG
authors.lastname: Kim
authors.affiliation: School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University, 268 Chungwon-daero, Chungju-si, Chungcheongbuk-do 380-701, Korea. kimzgo@naver.com.
authors.forename: Jae Seok
authors.initials: JS
authors.lastname: Kim
authors.affiliation: School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University, 268 Chungwon-daero, Chungju-si, Chungcheongbuk-do 380-701, Korea. wonzip@naver.com.
authors.forename: Wook Jae
authors.initials: WJ
authors.lastname: Yoo
authors.affiliation: Research Center for Radiotherapy, Korea Institute of Radiological and Medical Sciences, 215-4, Gongneung-dong, Nowon-gu, Seoul 139-706, Korea. jyh328@kirams.re.kr.
authors.forename: Young Hoon
authors.initials: YH
authors.lastname: Ji
authors.affiliation: School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University, 268 Chungwon-daero, Chungju-si, Chungcheongbuk-do 380-701, Korea. bslee@kku.ac.kr.
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Lee
mesh_terms: D003037:Cobalt Radioisotopes; D003198:Computer Simulation; D004583:Electrons; D005336:Fiber Optic Technology / Q000379:methods*; D005720:Gamma Rays; D009010:Monte Carlo Method; D055100:Optical Fibers; D019047:Phantoms, Imaging; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012815:Signal Processing, Computer-Assisted; D013816:Thermodynamics
chemical_list: D003037:Cobalt Radioisotopes; D019904:Polymethyl Methacrylate
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