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对HIRFL浅层肿瘤治疗终端提供的碳离子束的物理特性进行了首次测量．结果显示,能量为80．55MeV/u的~(12)C离子束,其束流强度在0．001—0．1nA范围时,直径50mm照射野的均匀性为73．48%,束流强度在一段时间内的稳定性为80．87%．测得了束流在治疗装置等中心处的深度剂量分布,其高剂量的Bragg峰位处在13．866mm的水等效深度,反推出碳离子束在等中心处对应的能量为71．71MeV/u,与计算值基本吻合．对自由空气电离室的读数进行了吸收剂量的标定．测量结果显示,HIRFL浅层肿瘤治疗装置性能与临床治疗的要求相比稍有差距,为了达到治疗终端进行临床试验的要求,须对治癌装置性能做进一步的优化．
The physical properties of the carbon ion beam provided at the HIRFL superficial tumor treatment terminal were first measured. The results show that the beam intensity of ~ (12) C with an energy of 80.55MeV / u is 73.48% when the beam intensity is in the range of 0.001-0.1nA, and the beam uniformity is 73.48% Over a period of stability of 80.87%. The depth dose distribution of the beam at the center of the treatment device was measured. The high dose Bragg peak was at the water equivalent depth of 13.866 mm, and the corresponding energy of the carbon ion beam at the isocenter was deduced to be 71.71 MeV / u, basically consistent with the calculated value. The readings of the free air ionization chamber were calibrated for absorbed dose. The measurement results show that the performance of the HIRFL superficial tumor treatment device is slightly different from the requirements of clinical treatment. In order to meet the requirements of the clinical trial of the treatment terminal, the performance of the cancer treatment device needs to be further optimized.