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介绍一种用于中国科学院近代物理研究所(IMP)重离子肿瘤治疗线上、于纵向场常压下工作的气体电离室,其灵敏面积为250mm×250mm,极间距离为10mm,电离室工作气体为P10,在85kPa下流气式工作。用75MeV/u12C离子入射,测量了电离室的坪曲线。发现电离室工作坪区900—3000V,12C的Bragg峰位于13.73mm,峰的极大值半高宽(FWHM)为0.19mm。
A gas ionization chamber for the treatment of heavy ion tumors in the Institute of Modern Physics, Chinese Academy of Sciences (IMP) is introduced. The gas ionization chamber operates at atmospheric pressure in the longitudinal direction. The sensitive area is 250 mm × 250 mm and the distance between the electrodes is 10 mm. The gas is P10, working at 85kPa. With 75MeV / u12C ions incident, measured ionization chamber flat curve. It is found that the Bragg peak of 12C is located at 13.73mm and the peak full width at half maximum (FWHM) is 0.19mm.