Preliminary investigation of radiation dose sensors based on aluminum-doped silicate optical fibers

Massimo Olivero, Alessandro Mirigaldi, Wilfried Blanc, Mourad Benabdesselam, Franck Mady, Carlo Molardi, Daniele Tosi, Alberto Vallan, Guido Perrone

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper reports on the first demonstration of in-situ, real-time dosimetry realized with an enhanced back-scattering optical fiber and a high-resolution optical back-scattering reflectometry measurement. This work is devised to overcome the current problems in monitoring radiotherapy treatments, in particular the difficult evaluation of not only the actual x-ray dose that is accumulated on the target volume, but also the distribution profile of the ionizing radiation beam. The experiments have been conducted by evaluating the radiation- induced spectral shift of the Rayleigh back-scattering along the fiber under test during x-ray exposure, in a radiation chamber. The sensing region is a section of aluminum-doped silicate fiber, that overcomes the poor sensitivity to radiation of standard, germanium-doped, silicate fibers for telecom applications. The preliminary results show that it is possible to remotely track the x-ray dose at high dose rates (700 Gy/min) and at rates closer to therapeutic values (22 Gy/min). A linear relationship between accumulated dose and spectral shift has been found. This research aims at developing a dose sensor with the most demanding features of small form factor, spatial profiling and remote interrogation.

Original languageEnglish
Title of host publicationIEEE Medical Measurements and Applications, MeMeA 2020 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728153865
DOIs
Publication statusPublished - Jun 2020
Event15th IEEE International Symposium on Medical Measurements and Applications, MeMeA 2020 - Bari, Italy
Duration: Jun 1 2020Jun 3 2020

Publication series

NameIEEE Medical Measurements and Applications, MeMeA 2020 - Conference Proceedings

Conference

Conference15th IEEE International Symposium on Medical Measurements and Applications, MeMeA 2020
CountryItaly
CityBari
Period6/1/206/3/20

Keywords

  • Ionizing radiation sensors
  • Optical fiber sensors
  • Radiation dosage
  • Radiation monitoring

ASJC Scopus subject areas

  • Biomedical Engineering
  • Medicine (miscellaneous)
  • Health Informatics
  • Rehabilitation
  • Instrumentation

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