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Toward a novel dosimetry system using acrylic disk radiation sensor for proton pencil beam scanning
Author(s) -
Cho Shinhaeng,
Lee Nuri,
Song Sanghyeon,
Son Jaeman,
Kim Haksoo,
Jeong Jong Hwi,
Lee Se Byeong,
Lim Youngkyung,
Moon Sunyoung,
Yoon Myonggeun,
Shin Dongho
Publication year - 2018
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1002/mp.13149
Subject(s) - dosimetry , pencil beam scanning , ionization chamber , pencil (optics) , materials science , bragg peak , photoluminescence , optics , calibration , ionization , beam (structure) , proton therapy , radiation , optoelectronics , nuclear medicine , physics , ion , medicine , quantum mechanics
Purpose Fabricate an acrylic disk radiation sensor ( ADRS ) and characterize the photoluminescence signal generated from the optical device as basis for the development and evaluation of a new dosimetry system for pencil beam proton therapy. Methods Based on the characteristics of the proposed optical dosimetry sensor, we established the relation between the photoluminescence output and the applied dose using an ionization chamber. Then, we obtained the relative integral depth dose profiles using the photoluminescence signal generated by pencil beam irradiation at energies of 99.9 and 162.1 MeV, and compared the results with the curve measured using a Bragg peak ionization chamber. Results The relation between the photoluminescence output and applied dose was linear. In addition, the ADRS was dose independent for beam currents up to 6 Gy/min, and the calibration factor for energy was close to 1. Hence, the energy dependence on the optical device can be disregarded. The integral depth dose profiles obtained for the ADRS suitable agreed with the curve measured in the Bragg peak ionization chamber without requiring correction. Conclusions These results suggest that the ADRS is suitable for dosimetry measurements in pencil beam scanning, and it will be employed as a low‐cost and versatile dosimetry sensor in upcoming developments.