Korean Journal of Medical Physics 2009; 20(1): 30-36
Published online March 25, 2009
Copyright © Korean Society of Medical Physics.
Quality Correction for Ir-192 Gamma Rays in Air Kerma Strength Dosimetry Using Cylindrical Ionization Chambers
원통형 전리함을 이용한 Ir-192 선원에 대한 공기커마세기 측정 시 선질보정에 관한 연구
Dong Hyeok Jeong*, Jhin Kee Kim†, Ki Hwan Kim‡, Young Kee Oh§, Soo Kon Kim∥, Kang Kyoo Lee*¶, Sun Rock Moon*¶
정동혁*ㆍ김진기†ㆍ김기환‡ㆍ오영기§ㆍ김수곤∥ㆍ이강규*¶ㆍ문성록*¶
*Department of Radiation Oncology, School of Medicine, Wonkwang University, Iksan, †Research Institute of Clinical Medicine, Chonbuk National University, Jeonju, ‡Department of Radiation Oncology, Chungnam National University Hospital, Daejeon, §Department of Radiation Oncology, Keimyung University Dongsan Medical Center, Daegu, ∥Department of Radiation Oncology, Kangwon University Hospital, Chuncheon, ¶Institute of Wonkwang Medical Science, Iksan, Korea
*원광대학교 의과대학병원 방사선종양학과, †전북대학교 임상의학연구소, ‡충남대학교병원 방사선종양학과, §계명대학교 동산병원 방사선종양학과, ∥강원대학교병원 방사선종양학과, ¶원광의과학연구소
The quality correction in the air kerma dosimetry for Ir-192 using farmer type ionization chambers calibrated by Co-60 quality is required. In this study we determined quality factor (
) of two ionization chambers of PTW-N30001 and N23333 for Ir-192 source using dosimetric method. The quality factors for energy spectrum of microSelectron were determined as
=1.016 and 1.017 for PTW-N30001 and N23333 ionization chambers respectively. We applied quality factors in air kerma dosimetry for microSelectron source and compared with reference values. As a results we found that the differences between reference air kerma rate and measured it with and without quality correction were about -0.5% and -2.0% respectively.
KeywordsQuality factor, Ir-192 source, Air kerma dosimetry
