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KMID : 1038720150260030178
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Progress in Medical Physics
2015 Volume.26 No. 3 p.178 ~ p.184
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Determination of Beam Quality Correction Factors for the PTW-Markus Chamber for Electron Beam Qualities R50=1.0 and 1.4 g/cm2
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Kim Me-Young
Rhee Dong-Joo
Jeong Dong-Hyeok
Moon Young-Min
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Abstract
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The Markus ionization chamber® is a small plane parallel ionization chamber widely used in clinical electron beam dosimetry. Plane parallel chambers were recommended for low energy electron dosimetry with the beam quality at R50<4.0 g/cm2 (E??10 MeV) according to TRS-398 protocol. However, the quality correction factors (kQ,Q0) of the Markus chamber was not presented in TRS-398 protocol for electron beam quality at R50<2.0 g/cm2 (E??4 MeV). In this study, the kQ,Q0 factors of the Markus chambers (PTW-34045) for beam qualities at R50=1.0, 1.4, 2.0, 2.5, 3.0, and 5.0 g/cm2 were determined by Monte Carlo calculations (DOSRZnrc/EGSnrc) and the dosimetric formalism of quality correction factor. The derived kQ,Q0 values were evaluated using the produced data based on TRS-398 and TG-51 protocols and known values for the Markus chamber.
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KEYWORD
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Markus chamber, Quality correction factor, Electron dosimetry
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