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KMID : 1164220080200020103
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Journal of Korean Society for Radiotherapeutic Technology
2008 Volume.20 No. 2 p.103 ~ p.107
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Surface Dose Measurement of Electron Beam within the Magnetic Field Variation
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Je Jae-Yong
Noh Kyung-Suk
Shin Woon-Jae
Park Cheol-Woo
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Abstract
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Purpose: This paper describes a electron field presence of magnetic field, intensity and shape surface dose variation to clinical application possibility.
Materials and Methods: The using 6 MeV electron and 10×10㎠ field size, 9 hole to shielding block make the by measure the film, when the magnetic field position inside and outside of the X-Omat film and parallel plate ionization chamber using the surface dose measured.
Results: Present of 4 cm to the side at angle about 3 degree from beam center, use of ring type magnetic is 0.9% increase the surface dose, lens block located in the magnetic field the surface dose 1.58% increase, half magnetic field’s position on the side of them at the field center of the 3.6% increase of the surface dose.
Conclusion: Surface dose variation is with magnetic field about the mean electron beam of progress direction change, orbit region patient’s is inconvenient without surface dose increase percentage case goodness will be used as a useful way.
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KEYWORD
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electron beam, magnetic field, surface dose
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