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目的 :测试新安装的Varian 2 30 0C/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、射线的平坦度、对称性、半影宽度、吸收剂量的短期重复性和线性、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 2 2 % ,均符合国标规定值≤ 2 %的要求。
Purpose : To test the main physical properties of the newly installed Varian 2 30 0C/D medical linear accelerator. Test method: using ionization chamber method, film method and three-dimensional water tank scanning method, mainly according to national standards on the mechanical properties of the accelerator, the flatness of the ray, symmetry, penumbra width, the short-term reproducibility of the absorbed dose and linear, accurate dose rate Sex and 15MV X-ray maximum useful beam leakage ray and other tests. Results: The accuracy of the isocenter is ≤ 1mm; the conformity of the light field and the radiation field is ≤ 1mm; the flatness, symmetry, and penumbra width of the ray meet the requirements of the national standard values ≤ 6%, ≤ 3%, and ≤ 80mm, respectively; The short-term reproducibility of the absorbed dose was good, with the maximum deviation being only 0.4%; the maximum deviations of the absorbed linear doses of 6MV and 12MeV were 0 66% and 0 2 2%, respectively, which were in line with the requirement of the national standard ≤ 2%.