title: Application of Cerenkov radiation generated in plastic optical fibers for therapeutic photon beam dosimetry.
abstract: A Cerenkov fiber-optic dosimeter (CFOD) is fabricated using plastic optical fibers to measure Cerenkov radiation induced by a therapeutic photon beam. We measured the Cerenkov radiation generated in optical fibers in various irradiation conditions to evaluate the usability of Cerenkov radiation for a photon beam therapy dosimetry. As a results, the spectral peak of Cerenkov radiation was measured at a wavelength of 515 nm, and the intensity of Cerenkov radiation increased linearly with increasing irradiated length of the optical fiber. Also, the intensity peak of Cerenkov radiation was measured in the irradiation angle range of 30 to 40 deg. In the results of Monte Carlo N-particle transport code simulations, the relationship between fluxes of electrons over Cerenkov threshold energy and energy deposition of a 6 MV photon beam had a nearly linear trend. Finally, percentage depth doses for the 6 MV photon beam could be obtained using the CFOD and the results were compared with those of an ionization chamber. Here, the mean dose difference was about 0.6%. It is anticipated that the novel and simple CFOD can be effectively used for measuring depth doses in radiotherapy dosimetry.
authors: Kyoto University, Research Reactor Institute, Nuclear Engineering Science Division, Asashiro-nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan.
authors: Kyoung Won
authors: KW
authors: Jang
authors: Takahiro
authors: T
authors: Yagi
authors: Cheol Ho
authors: CH
authors: Pyeon
authors: Wook Jae
authors: WJ
authors: Yoo
authors: Sang Hun
authors: SH
authors: Shin
authors: Chiyoung
authors: C
authors: Jeong
authors: Byung Jun
authors: BJ
authors: Min
authors: Dongho
authors: D
authors: Shin
authors: Tsuyoshi
authors: T
authors: Misawa
authors: Bongsoo
authors: B
authors: Lee
mesh_terms: D004583:Electrons; D006801:Humans; D055100:Optical Fibers; D055620:Optical Phenomena; D019047:Phantoms, Imaging; D017785:Photons / Q000627:therapeutic use*; D010969:Plastics; D011874:Radiometry / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D011879:Radiotherapy Dosage; D012588:Scintillation Counting
chemical_list: D010969:Plastics