Radiotherapy fiber dosimeter probes based on silver-only coated hollow glass waveguides

Arash Darafsheh, Jeffrey E. Melzer, James A. Harrington, Alireza Kassaee, Jarod C. Finlay

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Manifestation of Čerenkov radiation as a contaminating signal is a significant issue in radiation therapy dose measurement by fiber-coupled scintillator dosimeters. To enhance the scintillation signal transmission while minimizing Čerenkov radiation contamination, we designed a fiber probe using a silver-only coated hollow waveguide (HWG). The HWG with scintillator inserted in its tip, embedded in tissue-mimicking phantoms, was irradiated with clinical electron and photon beams generated by a medical linear accelerator. Optical spectra of the irradiated tip were taken using a fiber spectrometer, and the signal was deconvolved with a linear fitting algorithm. The resultant decomposed spectra of the scintillator with and without Čerenkov correction were in agreement with measurements performed by a standard electron diode and ion chamber for electron and photon beam dosimetry, respectively, indicating the minimal effect of Čerenkov contamination in the HWG-based dosimeter. Furthermore, compared with a silver/dielectric-coated HWG fiber dosimeter design, we observed higher signal transmission in the design based on the use of silver-only HWG.

Original languageEnglish
Article number015006
JournalJournal of biomedical optics
Issue number1
StatePublished - Jan 2018


  • dosimetry
  • hollow waveguide
  • optical fiber
  • radiation therapy
  • spectroscopy
  • Čerenkov radiation


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