Ultra sensitive high temporal resolution measurement of X-Ray pulses from modern Linac machines

Lingxia Chen, Elfed Lewis, Wenhui Zhao, Peter Woulfe, Sean Gillespie, Sinead O'Keeffe

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

Abstract

Inorganic phosphor material, gadolinium oxysulphide active with terbium (Gd2O2S:Tb3+) has been previously investigated as a scintillator used in the dosimeter to detect the X-Ray dose due to its high light yield efficiency of converting the X-Ray into the visible green lights. Apart from the properties of light yield efficiency, fast scintillation and lower energy resolution matters for the clinic applications. Therefore, this work is focusing on the difference between the long and short decay time of the scintillator when the sensors are exposed to radiation source delivered by a modern LINAC (Linear accelerator) machine. Herein, the output signal with up to 40 ns temporal resolution has been measured. The final results show that inorganic phosphor material used in this study with long decay time (Gd2O2S:Tb3+) has a heavy after-glow phenomena compared with the organic scintillator with short decay time (BCF-12 scintillating fibre). This work is to show the magnitude of difference of the photon yield efficiency and decay time between the Gd2O2S:Tb3+ and the BCF-12. The output intensity of Gd2O2S:Tb3+ is approximately 180 times higher than the BCF-12's, however the BCF-12 can effectively profile the duration of the radiation source against the beam on time.

Original languageEnglish
Title of host publicationIEEE SENSORS 2017 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-3
Number of pages3
ISBN (Electronic)9781509010127
DOIs
Publication statusPublished - 21 Dec 2017
Externally publishedYes
Event16th IEEE SENSORS Conference, ICSENS 2017 - Glasgow, United Kingdom
Duration: 30 Oct 20171 Nov 2017

Publication series

NameProceedings of IEEE Sensors
Volume2017-December
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229

Conference

Conference16th IEEE SENSORS Conference, ICSENS 2017
Country/TerritoryUnited Kingdom
CityGlasgow
Period30/10/171/11/17

Keywords

  • dosimeter
  • external beam radiotherapy
  • high temporal resolution
  • optical fibre sensors
  • real-time radiation dose measurement

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