الفهرس 
الغلافOnly 14 pages are availabe for public view
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Abstract
Treatment planning systems that depends on Monte Carlo methods require enormous effort, time and high accuracy to perform acceptance testing, and commissioning for linear accelerators. Small-volume chambers are desirable in measuring high dose gradient regions like penumbra and build up. The aim of this work was to investigate the accuracy of parallel plate ionization chambers in commissioning beam data for linear accelerators against Thimble ionization chambers and Gafchromic films. The data commissioning percentage depth dose (PDD) and beam profiles were collected form Versa HD (Elekta, Stockholm, Sweden) linear accelerator for energies of 6 and 10 MV with and without a flattening filter for different field sizes by using IBA PPC05 (885, Germany) Parallel Plate Chamber, IBA CC13 (14005, Germany) Ionization Chamber and Gafchromic films. The data commissioning percentage depth dose (PDD) and beam profiles were done for different field sizes from 5x5 cm2, 10x10 cm2, 15x15 cm2 and 20x20 cm2 in IBA computerized 3D water phantom. In‐plane and cross‐plane profile scans were acquired for the abovementioned fields at depths of 5 cm, 10 cm, and 20 cm.