On the origin of the visible light responsible for proton dose measurement using plastic optical fibers

Arash Darafsheh, Reza Taleei, Alireza Kassaee, Jarod C. Finlay

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations


We experimentally and by means of Monte Carlo simulations investigated the origin of the visible signal responsible for proton therapy dose measurement using bare plastic optical fibers. Experimentally, the fiber optic probe, embedded in tissue-mimicking plastics, was irradiated with a proton beam produced by a proton therapy cyclotron and the luminescence spectroscopy was performed by a CCD-coupled spectrograph to analyze the emission spectrum of the fiber tip. Monte Carlo simulations were performed using FLUKA Monte Carlo code to stochastically simulate radiation transport, ionizing radiation dose deposition, and optical emission of Čerenkov radiation. The spectroscopic study of proton-irradiated plastic fibers showed a continuous spectrum with shape different from that of Čerenkov radiation. The Monte Carlo simulations confirmed that the amount of the generated Čerenkov light does not follow the radiation absorbed dose in a medium. Our results show that the origin of the optical signal responsible for the proton dose measurement using bare optical fibers is not Čerenkov radiation. Our results point toward a connection between the scintillation of the plastic material of the fiber and the origin of the signal responsible for dose measurement.

Original languageEnglish
Title of host publicationDesign and Quality for Biomedical Technologies X
EditorsRamesh Raghavachari, Rongguang Liang
ISBN (Electronic)9781510605534
StatePublished - 2017
EventDesign and Quality for Biomedical Technologies X - San Francisco, United States
Duration: Jan 28 2017Jan 29 2017

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferenceDesign and Quality for Biomedical Technologies X
Country/TerritoryUnited States
CitySan Francisco


  • Dosimetry
  • Ionizing radiation
  • Optical fiber
  • Proton therapy
  • Spectroscopy
  • Čerenkov radiation


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