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Advanced characterization of an optical fibre sensor system based on an MPPC detector for measurement of X-ray radiation in clinical linacs

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dc.contributor.author Chen, Lingxia
dc.contributor.author Ong, Yong Sheng
dc.contributor.author Chen, Shuilin
dc.contributor.author O'Keeffe, Sinéad
dc.contributor.author Gillespie, Sean
dc.contributor.author Woulfe, Peter
dc.contributor.author Jiang, Benxue
dc.contributor.author Grout, Ian
dc.contributor.author Lewis, Elfed
dc.date.accessioned 2020-07-24T08:04:53Z
dc.date.issued 2020
dc.identifier.uri http://hdl.handle.net/10344/9033
dc.description peer-reviewed en_US
dc.description The full text of this article will not be available in ULIR until the embargo expires on the 02/06/2022
dc.description.abstract A reliable, accurate and in-vivo dosimetry system for measuring the radiation dose and profiling the X-ray beam during radiotherapy is reported. Its dynamic range is investigated using an accurately controlled pulsed light emitting diode (LED) system. Highly resolved temporal analog and digital signals were captured from the analog and digital outputs of a multi-pixel photon counter (MPPC) detector when exposed to the LED system. The photon distribution of a low intensity pulsed LED light source was observed and is found to obey a Poisson distribution with changing light intensity. The average number of photons was obtained using the digital MPPC output signals which in turn allowed the appropriate intensity of the light source to be determined for the correct light exposure conditions for the detector. The average analog output voltage over a single 3 μs pulse is determined to indicate the intensity of the detected light. The MPPC detector output analog signal is limited to a narrow range (0.6 V to 1.4 V) to ensure adequate signal detection level (the lower limit) and prevention of entry into saturation (the upper limit) which also corresponds to a digital output signal range (in counts). An average photon number range of 3 to 7 for the digital output signal is established, which leads to the establishment of a unique and constant photon number to average output voltage ratio of 4.64 ± 0.10. Experimental results show that the establishment of this ratio is significant as adherence to it ensures the correct exposure conditions of the MPPC and speeds up the measurement cycle in the clinical setting. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation 20140031 en_US
dc.relation.ispartofseries Sensors and Actuators A: Physical;112129
dc.relation.uri https://doi.org/10.1016/j.sna.2020.112129
dc.rights This is the author’s version of a work that was accepted for publication in Sensors and Actuators A: Physical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Sensors and Actuators A: Physical, 2020, 112129 https://doi.org/10.1016/j.sna.2020.112129 en_US
dc.subject optical fibre sensors en_US
dc.subject photodetectors en_US
dc.subject radiation monitoring en_US
dc.subject scintillators en_US
dc.subject scintillation en_US
dc.title Advanced characterization of an optical fibre sensor system based on an MPPC detector for measurement of X-ray radiation in clinical linacs en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.sna.2020.112129
dc.contributor.sponsor ERC en_US
dc.contributor.sponsor IRC en_US
dc.contributor.sponsor SFI en_US
dc.relation.projectid 20140031 en_US
dc.relation.projectid GOIPG/2015/3135 en_US
dc.relation.projectid UF150618 en_US
dc.date.embargoEndDate 2022-06-02
dc.embargo.terms 2022-06-02 en_US
dc.rights.accessrights info:eu-repo/semantics/embargoedAccess en_US


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