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Characteristics of fiber-optic radiation sensor for passive scattering proton beams

Authors
Son, J.Kim, M.Jeong, J.Lim, Y.Lee, S. B.Shin, D.Yoon, M.
Issue Date
11월-2017
Publisher
IOP PUBLISHING LTD
Keywords
Dosimetry concepts and apparatus; Photon detectors for UV, visible and IR photons (vacuum) (photomultipliers, HPDs, others)
Citation
JOURNAL OF INSTRUMENTATION, v.12
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF INSTRUMENTATION
Volume
12
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/81647
DOI
10.1088/1748-0221/12/11/P11015
ISSN
1748-0221
Abstract
The aims of this study were to investigate the characteristics of a fiber-optic radiation sensor (FORS) that detects the fluorescence light produced by proton beam and to verify its effectiveness in proton therapy quality assurance (QA). Various characteristics of the FORS were investigated, such as the linearity of its relationships to the sensitive length of fiber for the proton beams of intermediate ranges (165.46 and 178.37 MeV) and to the measured dose, as well as its dose rate dependence. In addition, patient specific precription dose QA was conducted for five patients actually undergoing proton therapy and the results were compared with the doses measured using an ion chamber. The results show that the signal of the FORS is linearly related to the sensitive length of fiber and to the irradiated dose in the range from 1 to 500 cGy. The QA results obtained using the FORS system showed good agreement with the corresponding ion chamber results, with an average difference of 0.40% and a standard deviation of 0.35%. The FORS was dose-rate independent for proton currents up to 5 Gy/min. The profiles of various proton beams obtained using an array of FORS, which were measured as an application of the developed dosimetric system, closely agreed with the profiles acquired using EBT3 film. In summary, the experimental results of FORS demonstrated its effectiveness for use in various proton therapy QA tests.
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보건과학대학 (바이오의공학부)
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