Journal of Medical Physics
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Year : 1997  |  Volume : 22  |  Issue : 4  |  Page : 169-194

Surface Dose Measurements Using Parallel Plate Markus Chamber For 60co, 6 & 10 MV Photon Beams

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HK Malhotra

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Fixed volume parallel plate ion chambers are commonly employed for surface dose measurement purposes as the much desired extrapolation chambers are rarely available in a department. They, however, overestimate the surface doses by an appreciable amount, sometimes as much as a factor of 2, and needs careful consideration before using measured data for clinical dosimetry. Surface dose measurements were carried out for 60Co, 6 and 10 MV photon beams using a PTW Markus parallel plate chamber as well as UF TLD powder. The Markus chamber was found to over-response the surface dose measurements by 18.7%, 10.6% and 6.7% in absolute terms for 6 0co, 6 and 10 MV, respectively, which is in conformity with the available literature.

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