GafChromic EBT in measurement for percent depth dose of high-energy electron beams

VernacularTitle:EBT剂量胶片测量电子线百分深度剂量的应用研究
Author: Wenzhao SUN ; Lixin CHEN ; Hongqiang SUN ; Xiaoyan HUANG ; Shaomin HUANG ; Xiaowu DENG
Publication Type:Journal Article
Keywords: Electron beam; Percent depth dose; Dosimetry
From: Chinese Journal of Radiation Oncology 2010;19(4):331-334
CountryChina
Language:Chinese
Abstract: Objective To evaluate the dosimetry of high-energy electron beams by using GafChromic EBT film. Methods The percent depth doses of electron beams of 4 MeV,6 MeV,8 MeV,10MeV, 12 MeV and 15 MeV were measured with EBT. The results were then compared with the measurements with diode detector in RFA and parallel plate chamber in water tank. Results The percent depth dose curves using EBT film had a good agreement with those using the other two detectors. Furthermore, no differences were found between up-right and tilt setup methods. When film upper edge is higher than water surface, a sharp drop of measurement results using EBT film was observed in comparison with those from diode detector in build-up region. Conclusions EBT film can be applied to measure percent depth doses of high-energy electron beams. During the EBT film measurements, the film should be tilted at the angle of 5degrees to the central axis of the field. When choosing up-right setup method, the edge of the film should be parallel to the water surface.