我院于九五年三月安装一台北京医疗器械研究所生产的ＢＪ - 6Ｂ型电子直线加速器 ,使用几年来 ,日均照射野一百多个 ,运行情况良好。下面就机器的主要特点及使用初期应注意的问题作一简述。一、主要特点 :(一 )Ｘ线能量为 6ＭＶ ,照射野最大 4 0ｃｍ×4 0ｃｍ (带圆角 ) ,剂量 In March 1995, our institute installed a BJ-6B electronic linear accelerator produced by the Beijing Institute of Medical Devices, and used it for more than 100 years in average daily exposure. The following is a brief description of the main features of the machine and the issues that should be taken care of in the early stages of use. First, the main features: (a) X-ray energy is 6MV, irradiation field maximum 4 0cm × 4 0cm (with rounded corners), dose