基于FLUKA平台的重离子治癌模拟实验

重离子治癌是指利用大型重离子加速器产生的高能带电重离子束辐照病灶来治疗恶性肿瘤的一种新型放射治疗方法.与传统的常规放射治疗方法相比,重离子束治疗癌症具有特殊的布拉格峰和高RBE优势.相关研究目前已成为放射治疗领域的前沿和热点,同时作为核科学前沿也常被引入到相关专业教学中,由于使用大型重离子加速器的实验教学很难引入高校,为了更好地展示加速器在核医学实验和临床治疗中的使用过程和效果,本文利用FLUKA软件作为操作平台,模拟了用碳离子束治疗脑部肿瘤的实验过程,并根据模拟结果调节参数,给出优化的治疗方案,使学生更深刻的掌握重离子与物质相互作用过程以及重离子治癌的基本原理.     

Cross Section of Heavy Ion Reaction （14.5 MeV/u） ^132Xe ＋ Bi

We investigate the cross section of the heavy ion reaction （14.5 MeV/u） ^132Xe ＋ Bi by using a CR-39 plastic track detector. The target-detector assembly is exposed at UNILAC beam facility of GSI, Germany. After etching under appropriate etching conditions, the detector is scanned for multipronged events produced as a result of interactions of projectile ions with target atoms. The elastic events are separated from binary events and used for the determination of the quarter-point angle. The quarter-point angle obtained is used to determine the total reaction cross section. The total experimental reaction cross section is determined by using statistics of inelastic events of two-pronged and higher multiplicity events. The experimental reaction cross sections determined by using elastic and inelastic data observed in the reaction under study are found to be in good agreement with the theoretically calculated value of reaction cross section using a sharp cutoff model.     

Ionizing Dose Effect of Thermal Oxides Implanted with Si^＋ Ions

Total ionizing dose effects of Si^＋ ion implanted thermal oxides are studied by 10keV x-ray irradiation. Photoluminescence （PL） method is engaged to investigate nanostructures of samples. Ar^＋ implanted samples are also studied by the same way to provide a comparison. The results show that Si^＋ implantation following with high temperature annealing can significantly reduce the radiation induced flatband shift, which is caused by net posi- tive charge accumulation in oxides. This reduction is attributed to the formation of Si nanoscale structures. Ar^＋ implantation is also found to reduce the radiation induced flatband shift, while it is different that the reduction with Si^＋ implantation shows little dependence on implant dose of Ar^＋ ions. This is explained by possible increase of recombination centres.     

用于浅层肿瘤重离子治疗的终端束流诊断控制系统

 设计了中国科学院近代物理研究所利用兰州重离子研究装置（HIRFL）进行浅层肿瘤临床治疗试验研究中所使用的束流诊断安全控制系统。该系统包括束流强度监测及保护、剂量测量、扫描波形监测及保护3个部分。系统基于PXI系统及LabVIEW软件,给出了该系统的各部分结构。从系统建立时的多次测试结果以及实际临床治疗试验研究时的长期运行结果来看,该束流诊断控制系统在控制辐照剂量以及安全保护方面能够满足当前重离子加速器浅层肿瘤临床治疗试验的基本要求,为试验研究的顺利进行提供了可靠的保证。     

Resonances in Positron-He Scattering

We present the results for resonances in positron-He scattering at low impact energy （19.3-24.0eV） by using the momentum space coupled-channel optical （CCO） method. The S-partial wave resonance at 20.16 eV is found for the first time.     

中国科学院近代物理研究所重离子辐照生物研究平台

介绍了中国科学院近代物理研究所和兰州重离子加速器国家实验室的重离子加速器辐照生物研究平台、 重离子辐照生物研究发展规划及在现代农业和生物产业方面取得的一些最新进展。 Heavy-ion accelerator facilities for the researches on biological effects induced by heavy ion at Institute of Modern Physics（IMP）, Chinese Academy of Sciences and National Laboratory of Heavy ion Accelerator in Lanzhou（HLHIAL） are introduced. New progresses in modern agriculture and biological industry are presented.     

高能重离子碰撞间歇行为的系统研究

本文用阶乘矩方法分析了几种入射能量(14.6,60,200A GeV)下氧、硅和硫离子诱导乳胶核反应和硫离子与金靶相互作用过程的间歇行为.利用EMU01组的实验数据发现,在赝快度间隔1—0.1范围内,这几种核反应过程都有间歇性.间歇指数随入射能量和末态相对论带电粒子平均多重数的增加而减少,随靶核质量的增加而增加.在实验误差范围内,观察到间歇指数随射弹核质量的增加有上升趋势.     

兰州重离子加速器及其应用前景

本文简要地介绍了兰州重离子加速器的结构和建造过程，并对它的应用前景作了简单的描述．