A Study Of The Surface Dose And The Build-Up Region For Photon Beams Of 6 And 10 MV Linear Accelerators

Although the skin sparing effect represents one of the major advantages of the use of megavoltage photon beams, it's well known that the dose to the skin can be significant, depending on the clinical set-up. A great portion of this dose comes from contaminant electrons arising from the head of the machine (collimator and beam modifying devices). Knowledge of the skin dose and the build-up region is important for treatments close to the skin, for different clinical set-ups and for checking the predictions of the different treatment planning systems. High skin doses can cause desquamation, erythema, fibrosis, necrosis and epilation