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KMID : 0357520070300020147
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Journal of Radiological Science and Technology
2007 Volume.30 No. 2 p.147 ~ p.151
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Quality Assurance of Air Kerma Strength for Ir-192 High Dose Rate Source
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Kim Jon-Eon
Yoon Chen-Sil
Kim Sung-Hyun
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Abstract
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AAPM TG43 report has recommended to measure air kerma strength with the strength of source. Main purpose of this study is to verify the accuracy of air kerma strength provided by manufacturer. Materials for this study were MAX-4001 Electrometer, HDR 1000 Plus of the corporation of standard imaging, and 6 french bronchial Applicator with 1000 mm. we measured ionization current in 10-90 mm range from the bottom of the central axis of chamber. The reference point of calibration displayed by the maximum ionization current in the ionization current curve was measured, and air kerma strength was computed from the maximum ionization current. we acquired 50 mm distance to correspond with the maximum ionization current in the ionization current curve. Its distance has perfectly fitted to the source reference point of calibration certificate of UW-ADCL. Air kerma strength computed value has measured about 0.5% more than calibration value provided by manufacturer. Air kerma strength of calibration certificate provided by manufacturer has acquired reliable results. This study shows that considering the move error of dwell position of source and the dead space length in well-type chamber is a good way to get an accurate result.
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KEYWORD
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Strength of source, Air kerma strength, Well-type chamber
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