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작성일 : 20-03-09 15:50
Toward a novel dosimetry system using acrylic disk radiation sensor for proton pencil beam scanning
 글쓴이 : 관리자
조회 : 2,145  

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. 

Shinhaeng Cho
Proton Therapy Center, National Cancer Center, Goyang, Korea
Nuri Lee
Department of Radiation and Oncology, National Medical Center, Seoul, South Korea
Sanghyeon Song
Department of Radiation and Oncology, Soon Chun Hyang University Hospital, Seoul, South Korea
Jaeman Son
Department of Radiation and Oncology, Seoul National University Hospital, Seoul, South Korea
Haksoo Kim, Jong Hwi Jeong, Se Byeong Lee, and Youngkyung Lim
Proton Therapy Center, National Cancer Center, Goyang, Korea
Sunyoung Moon and Myonggeun Yoon
Department of Bio-Convergence Engineering, Korea University, Seoul, Korea
Dongho Shina)
Proton Therapy Center, National Cancer Center, Goyang, Korea

Med. Phys. 45(11), November 2018