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Original Article

Korean Journal of Medical Physics 2004; 15(2): 105-111

Published online June 25, 2004

Copyright © Korean Society of Medical Physics.

Feasibility Study of Parallel- Plate Detector Using Dielectric film for 6 MV X-ray

6MV X-선 검출특성 조사를 위하여 유전체 필름을 이용하여 제작한 평행판 검출기의 유용성

Ki Hwan Kim*, Moon June Cho*, Yong Uhn Kim, Byong Yong Yi§, Jeong Kee Kim, Sang Wook Lim§, Hyeon Soo Kim

김기환*·조문준*·김용은·이병용§·김정기·임상욱§·김현수

*Department of Radiation Oncology, Chungnam National University Hospital, Cancer Research Institute, Chungnam National University, Department of Physics, College of Natural Science, Chungbuk National University, §Department of Radiation Oncology, University of Ulsan, Asan Medical Center, Department of Radiation Oncology, Dong A University Hospital, Department of Physics, Kyonggi University

*충남대학교병원 방사선종양학과, 충남대학교 암공동연구소, 충북대학교 자연과학대학 물리학과, §울산대학교 의과대학, 서울아산병원 방사선종양학과, 동아대학교병원 방사선종양학과, 경기대학교 물리학과

Abstract

The parallel plate detector with dielectric film for dosimetry was designed to measure detection characteristic of 6 MV X-ray with medical linear accelerator. PTFE film was inserted into FEP films that are made by two one-side metal coated materials for ion source. The thicknesses of PTFE dielectric film was 100Ռm and the thickness of FEP dielectric film was 100Ռm, respectively. This detector was fixed by two acrylic plate for physical hardness and geometrical consistency. The geometrical condition for measurement with parallel-plate detector was below; SSD=100 cm and the 5 cm depth between detector and phantom surface The major parameter of detector characteristics such as zero drift current, leakage current, charge response by applied voltage, reproducibility, linearity, TMR measurement, dose rate effect were measured. The zero drift currents are 8.3 pA and leakage currents are 10 pA. The charge response of applied voltage is showing linearity in 414 voltage. The measurement deviation of reproducibility in this detector is within 1% for dose and the linearity of applied dose shows in this detector. The TMR curves in phantom between this parallel plate detector and reference detector are matched within 3% deviation from maximum dose depth to 7.5 cm depth. It is considered that this dosimetric system is satisfactory for the purpose of the constancy check of the 6 MV x-ray from medical linear accelerator.

KeywordsX-ray, Parallel Plate Detector, Dielectric Film

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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