Papers by Author: Vahid Fayaz

Abstract: scatter photon produced during radiationtherapy with high energy photons is the main source of unwanted out-of-field and superficial received doses of patients.Surface buildup dose is dependent on electron contamination primarily from the unblocked view of the flattening filter and secondarily from air and collimation systems .We performed a comprehensive set of surface and buildup dose measurements with a thin window parallel-plate (PPC-40) chamber to examine effects of attenuating media in front of 6 MV X ray. To evaluate the impact of beam segmentation on buildup dose, measurements were performed with 10 × 10 cm2 fields, Measurements were performed in Solid Water using parallel plate chambers and diode for a 6 MV X-ray beam.

Abstract: The semiconductors have conductions ranged between the conductors and nonconductors. Conduction makes the semiconductors one of the most important materials for electric applications. Therefore, with the receiving pulses from cathode in different geometries such as Cartesian, cylindrical and spherical the most commonly used pulse is the pulse created by the detector with cubic geometry.