Abstract
A radiochromic film extrapolation method is described for the measurement of surface dose from high energy photon beams. Extrapolated central axis entrance surface dose using Gafchromic film for a field size is and of for 6 and 10 MV x rays, respectively. Extrapolated surface dose for a field with a 10 mm perspex block tray is and of for 6 and 10 MV beams, respectively. All results agree with uncorrected Attix parallel plate ionization chamber surface ionization within 4% for the same beam energies and configurations.
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