Korean J Med Phys.
2009 Mar;20(1):30-36.
Quality Correction for Ir-192 Gamma Rays in Air Kerma Strength Dosimetry Using Cylindrical Ionization Chambers
- Affiliations
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- 1Department of Radiation Oncology, School of Medicine, Wonkwang University, Iksan, Korea. sunrmoon@wonkwang.ac.kr
- 2Research Institute of Clinical Medicine, Chonbuk National University, Jeonju, Korea.
- 3Department of Radiation Oncology, Chungnam National University Hospital, Daejeon, Korea.
- 4Department of Radiation Oncology, Keimyung University Dongsan Medical Center, Daegu, Korea.
- 5Department of Radiation Oncology, Kangwon University Hospital, Chuncheon, Korea.
- 6Institute of Wonkwang Medical Science, Iksan, Korea.
Abstract
- 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 (kappa u) 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 kappa u=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.
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