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为了评估弹核碎裂反应在碳离子肿瘤治疗中产生的影响,中国科学院近代物理研究所建立了一套探测器系统用来测量相关反应产物。这套探测系统包括起始探测器、水靶系统、带电粒子鉴别系统和中子测量系统。利用中国科学院近代物理研究所250MeV/u12C6+束打50mm水靶的实验在束测试了这套系统的性能。实验结果表明,通过ΔE-E和TOF-ΔE两种粒子鉴别方法这套探测系统清楚地区分了H,He,Li,Be,B和C等元素。通过计算不同Z值带电碎片的微分截面得到了这些带电碎片(本工作给出元素H和He)相应的角分布。这套探测系统中的带电粒子测量系统性能达到了设计的预期目标。
In order to assess the impact of the nuclear fragmentation reaction in the treatment of carbon ion tumors, a set of detector systems was established at the Institute of Modern Physics, Chinese Academy of Sciences to measure the relevant reaction products. The detection system includes the initial detector, water target system, charged particle identification system and neutron measurement system. The performance of the system was tested in a beam using a 250 MeV / u12C6 + Beam 50 mm water target at the Institute of Modern Physics, Chinese Academy of Sciences. The experimental results show that this detection system clearly distinguishes elements such as H, He, Li, Be, B and C through the method of ΔE-E and TOF-ΔE. The corresponding angular distributions of these charged fragments (H and He are given in this work) are obtained by calculating the differential cross section of charged fragments with different Z values. The performance of the charged particle measurement system in this detection system meets the design goals.