Construction and performance of a dose-verification scintillation-fiber detector for proton therapy

Suhyun Lee, Byungsik Hong, Kyong Sei Lee, Benard Mulilo, Sung Keun Park

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A multilayer scintillation-fiber detector has been developed for precision measurement of time-dependent dose verification in proton therapy. In order to achieve the time and position sensitivity required for the precision dose measurements, a prototype detector was constructed with double-clad 1-mm-thick scintillation fibers and 128-channel silicon photodiodes. The hole charges induced in each channel of the silicon photodiodes were amplified and processed with a charge-integration mode. The detector was tested with 45-MeV proton beams provided by the MC50 cyclotron at the Korea Institute of Radiological and Medical Science (KIRAMS). The detector response for a 45-MeV proton beam was agreed fairly well with the predicted by GEANT4 simulations. Furthermore, the quantitative accuracy appearing in the spatial distribution of the detector response measured for 20 s is in the order of 1%, whose accuracy is satisfactory to verify beam-induced dose in proton therapy. We anticipate that the detector composed of scintillation fibers and operating in the charge-integration mode allows us to perform quality measurement of dynamic therapeutic beams.

Original languageEnglish
Pages (from-to)6-11
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 2013


  • Dose verification
  • Dynamic beams
  • GEANT4 simulations
  • Proton therapy
  • Scintillation fibers

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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