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KMID : 0357520080310010083
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Journal of Radiological Science and Technology
2008 Volume.31 No. 1 p.83 ~ p.87
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10 MV X-ray Beam Dosimetry by Water and White Polystyrene Phantom
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Kim Jon-Eon
Cha Byung-Yul
Shin Jeong-Uk
Son Dae-Woong
Choi Chi-Won
Cha Byung-Youl
Kang Sang-Sik
Park Ji-Koon
Sin Jeong-Wook
Kim So-Yeong
Cho Sung-Ho
Son Dae-Woong
Choi Chi-Won
Park Chang-Hee
Yoon Chen-Sil
Lee Jong-Deok
Park Byung-Do
Nam Sang-Hee
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Abstract
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The purpose of this study is to get the correction factor to correct the measured values of the absolute absorbed dose proportional to the water equivalent depth. The measurement conditions in white polystyrene and water phantoms for 10MV X-ray beam are that the distance of source to center of ionization chamber is fixed at SAD 100 cm, the field sizes are , and the depths are 2.3 cm, 5 cm, 10 cm, and 15 cm, respectively. The mean value of ionization was obtained by three times measurements in each field size and depths after delivering 100 MU from linear accelerator with output of 400 MU per min to the two phantoms. The correction factor and the percentage deviation in TPR were obtained below 0.97% and 0.53%, respectively. Therefore, we can get high accuracy by using the correction factor and the percentage deviation in TPR in measuring the absolute absorbed dose with the solid water equivalent phantom.
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KEYWORD
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Solid water equivalent phantom, Water phantom, Absolute absorbed dose
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