中子受激辐射计算机断层扫描成像系统的MCNP模拟
发布时间：2018-11-17 14:37
【摘要】：本文对中子受激辐射计算机断层扫描成像(NSECT)系统进行了仿真计算,包括中子源的选择、准直屏蔽系统的设计、屏蔽墙和靶体的设置以及探测器的布置.采用MCNP程序模拟了D-T中子源产生的14MeV左右中子束在NSECT系统中轰击代替人体组织的圆柱体水体模的中子输运过程,记录并获得了元素特征γ射线和出射中子的通量分布及能谱图,该研究对中子成像平台的搭建有指导作用.从特征γ射线和出射中子的通量分布及能谱可知,在Z=0的平面上与中子束传播方向呈43.6° 50.9°的方向上布置高能γ探测器更利于得到可靠的成像数据,其中48.5°方向上可得到最佳的成像数据.从特征γ射线能谱找到了~(16)O对应的特征峰,特征峰能量与靶体元素的激发能完全一致,说明NSECT具备元素识别和确定元素浓度的能力,证明了NSECT被应用到癌症的早期或超早期诊断以及检查藏匿的炸药、毒品等领域的可能性.
[Abstract]:In this paper, the (NSECT) system of neutron stimulated radiation computed tomography imaging is simulated, including the selection of neutron source, the design of collimating shielding system, the setting of shielding walls and targets and the arrangement of detectors. The neutron transport process of 14MeV left and right neutron beams produced by D-T neutron source in the NSECT system was simulated by MCNP program. The flux distribution and energy spectrum of elemental characteristic 纬-rays and eject neutrons were recorded and obtained. This study can be used as a guide to the construction of neutron imaging platform. From the flux distribution and energy spectrum of the characteristic 纬 ray and the ejector, it can be seen that the high energy 纬 detector is more suitable for obtaining reliable imaging data on the plane of Z0 and the direction of neutron beam propagation is 43.6 掳/ 50.9 掳. The best imaging data can be obtained in the direction of 48.5 掳. The characteristic peak corresponding to ~ (16) O is found from the characteristic 纬 ray spectrum. The energy of the characteristic peak is completely consistent with the excitation energy of the target element, which indicates that NSECT has the ability to identify and determine the element concentration. It proves that NSECT can be used in the early or super early diagnosis of cancer and the detection of hidden explosives, drugs and so on.
【作者单位】： 兰州大学核科学与技术学院;
【基金】：国家自然科学基金(编号:11305083) 兰州大学中央高校基本科研业务费专项(编号:lzujbky-2016-27)资助
【分类号】：O571.5
[Abstract]:In this paper, the (NSECT) system of neutron stimulated radiation computed tomography imaging is simulated, including the selection of neutron source, the design of collimating shielding system, the setting of shielding walls and targets and the arrangement of detectors. The neutron transport process of 14MeV left and right neutron beams produced by D-T neutron source in the NSECT system was simulated by MCNP program. The flux distribution and energy spectrum of elemental characteristic 纬-rays and eject neutrons were recorded and obtained. This study can be used as a guide to the construction of neutron imaging platform. From the flux distribution and energy spectrum of the characteristic 纬 ray and the ejector, it can be seen that the high energy 纬 detector is more suitable for obtaining reliable imaging data on the plane of Z0 and the direction of neutron beam propagation is 43.6 掳/ 50.9 掳. The best imaging data can be obtained in the direction of 48.5 掳. The characteristic peak corresponding to ~ (16) O is found from the characteristic 纬 ray spectrum. The energy of the characteristic peak is completely consistent with the excitation energy of the target element, which indicates that NSECT has the ability to identify and determine the element concentration. It proves that NSECT can be used in the early or super early diagnosis of cancer and the detection of hidden explosives, drugs and so on.
【作者单位】： 兰州大学核科学与技术学院;
【基金】：国家自然科学基金(编号:11305083) 兰州大学中央高校基本科研业务费专项(编号:lzujbky-2016-27)资助
【分类号】：O571.5
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