Measurements and Removal of Cerenkov Light Generated in Scintillating Fiber-Optic Sensor Induced by High-Energy Electron Beams Using a Spectrometer

In this study, we measured scintillating and Cerenkov lights generated in a scintillating fiber-optic sensor using high-energy electron beams and a spectrometer. The spectrum of Cerenkov light generated in a plastic optical fiber was measured with a spectrometer and the intensities of Cerenkov light were measured for irradiated lengths of the plastic optical fiber by integrating the photon counts at every wavelength of the spectrum. The intensities of Cerenkov and scintillating lights were also characterized as a function of the incident angle of an electron beam from a clinical linear accelerator (CLINAC). To minimize or remove Cerenkov light, a subtraction method was employed using a background optical fiber. (C) 2011 The Japan Society of Applied Physics