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KMID : 0357520090320020205
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Journal of Radiological Science and Technology
2009 Volume.32 No. 2 p.205 ~ p.212
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Study on the Characteristics of Response Correction Factor of Ionization Chamber in RW3 Solid Phantom for High Energy X-rays
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Lee Jeong-Ok
Jeong Dong-Hyeok
Kim Bo-Gil
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Abstract
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The response correction factor ( h) is a factor to convert the response of the chamber in solid phantom to the response in water. In RW3 solid phantom, the dependency of beam quality and depth for high energy X-rays are known characteristics, however the dependency of field size, SSD, and chamber type are unknown. In this work we have studied the unknown characteristics on the dependency of response correction factor. The farmer type chamber (FC65G) and small chamber (CC13) were used and two beam qualities of 6 and 15 MV were evaluated. The measured response correction factors at the depth of 5 cm and 10 cm were h = 1.015 and 1.021 for 6 MV X-rays, and h = 1.024 and 1.029 for 15 MV X-rays. In conclusion the response correction factor did not depend on the field size and SSD while depending on the beam quality and depth. In the chambers, there are small differences between the two chambers used in this study but we think additional study for more chambers should be required. The results in this study can be used for analyzing the measured values from ionization chamber dosimetry in RW3.
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KEYWORD
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Response correction, RW3 solid phantom, Dose measurement
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