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KMID : 0384620090200010030
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Korean Journal of Medical Physics
2009 Volume.20 No. 1 p.30 ~ p.36
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Quality Correction for Ir-192 Gamma Rays in Air Kerma Strength Dosimetry Using Cylindrical Ionization Chambers
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Jeong Dong-Hyeok
Lee Kang-Kyoo
Moon Sung-Rock
Kim Jhin-Kee
Kim Ki-Whan
Oh Young-Kee
Kim Soo-Kon
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Abstract
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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.
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KEYWORD
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Quality factior, Ir-192 source, Air Kerma Dosimetry
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