For EDR2 film, this process was done in a dark room and every piece of film was sealed by black adjoining tape to shield it from the brightness. The film was placed in solid water phantom perpendicular to the central axis of the beam. The radiation output is equal to 0.8264 cGy/MU for field size 10×10 cm2 at depth of 10 cm for 100 cm. SAD. The films were irradiated for known dose by using SSD technique. Table 4.3 to 4.5 show the MU setting for exposing film in this study. The unexposed film was processed at the same time in order to determine the fog level. In order to minimize as many variations as possible, each experiment and film calibrations were performed using film from the same batch. All films were processed under the same condition using an automatic film processor (KONICA MINOLTA Model SRX-101A).