Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Measurement of Scintillation Responses of Scintillation Fibers for Dose Verification in Proton Therapy

  • Kim, C. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Hong, B. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Jhang, G. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Joo, E. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Lee, K.S. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Lee, K.S. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Lee, S. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Lee, S.K. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Park, S.K. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Shim, H.H. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Shin, S.S. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Sim, K.S. (Department of Physics and Korea Detector Laboratory, Korea University) ;
  • Cha, H.K. (Korea Atomic Energy Research Institute)
  • Published : 2012.03.15
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Abstract

Here, we report on the measurement of scintillation responses of scintillation fibers for precision dose verification in proton therapy. A detector equipped with two layers of 1-mm-thick scintillation fibers and 46-channel silicon photodiodes was constructed and tested with 45-MeV proton beams provided by the MC50 proton cyclotron at the Korea Institute of Radiological and Medical Science (KIRAMS). Scintillation responses of the detector for the protons were measured as a function of depth in an absorber made of PMMA (poly methyl methacrylate) and PET (polyester) films whose thicknesses varied from 0.148 to $2.0g{\cdot}cm^{-2}$. Quenching of the scintillation responses of the detector was evaluated by comparison of the data to the specific energy loss predicted by GEANT4-based simulations. The first-order parameter of the Birks model, ${\kappa}B$, for scintillation fibers, as derived from the ratios of specific energy losses to scintillation responses, was $(2.38{\pm}0.17){\times}10^{-2}$.

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