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The aim of the study was to investigate surface and buildup region doses for6MV and 15MV photon beams using a Markus parallel-plate ionization chamber,GafChromic EBT3 film, and MOSFET detector for different field sizes and beamangles. The measurements were made in a water equivalent solid phantom at thesurface and in the buildup region of the 6MV and 15MV photon beams at 100 cmsource-detector distance for 5 x 5, 10 x 10, and 20 x 20 cm2 field sizes and 0,30, 60, and 80 beam angles. The surface doses using 6MVphoton beams for 10 x 10cm2 field size were found to be 20.3%, 18.8%, and 25.5% for Markus chamber,EBT3 film, and MOSFET detector, respectively. The surface doses using 15MVphoton beams for 10 x 10 cm2 field size were found to be 14.9%, 13.4%, and16.4% for Markus chamber, EBT3 film, and MOSFET detector, respectively. Thesurface dose increased with field size for all dosimeters. As the angle of theincident radiation beam became more oblique, the surface dose increased. Theeffective measurement depths of dosimeters vary; thus, the results of themeasurements could be different. This issue can lead to mistakes at surface andbuildup dosimetry and must be taken into account.

Surface and buildup region dose measurements with Markus parallel-plate  ionization chamber, Gafchromic EBT3 film and MOSFET detector for high energy  photon beams