Varian 2300C/D医用直线加速器主要物理性能的测试

目的：测试新安装的Varian2300C/D医用直线加速器主要物理性能。测试方法：利用电离室法、胶片法及三维水箱扫描法，主要按照国家标准对加速器的机械性能、放射的平坦度、对称性、半影宽度、吸收剂量的短期重复性的线性、剂量率准确性以及15MVX射线最大有用线束外漏射线等进行 测试。结果：等中心精度≤1mm，灯光野与照射野的符合性≤1mm；射线的平坦度、对称性、半影宽度分别满足国家标准规定值≤6％、≤3％、≤8．0mm的要求；吸收剂量的短期重复性较好，最大偏差仅为0．4％；6MV和12ＭeV吸收剂量线性的最大偏差分别为0．66％和0．22％，均符合国际规定值≤2％的要求。

Measurement of important physical performances for Varian 2300 C/D linear accelerator

Objective: To measure some important physical performances for new Varian2300C/D Linear accelerator.Methods: The methods of measurement were in according with the standards of China using the ionization chamber and X-ray film as well as 3D scanning system. Results: the radiation intersection point had a maximum excursion of ≤1.0mm radius. The coincidences of Light field and radiation field were no morn than1.0 mm difference on any edge.The actual field flatenss was ≤6%, the actual symmetry was≤3%, the penumbra region width was ≤8. 0mm. Theabsorption dose short term reproduction was good, the maximum difference was only 0.4 %. the maximum deviofion was0.66%, and 12 MeV was 0.22%, they were all no more than 2%.