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5单元中子散射相机仿真研究

Simulation research of neutron scatter camera with five units

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摘要

采用粒子输运程序MCNP与FORTRAN,MATLAB程序相结合,对一种5单元结构的中子散射相机原型进行了蒙特卡罗模拟,对252Cf裂变中子源进行了图像、能量的重建。结果表明:该相机的能量分辨力为9%左右,角分辨与闪烁体的体积有关; 中子能量为2 MeV左右时,散射相机的探测效率达到最大值; 源的距离、闪烁体尺寸、前后面板距离、事件数等对重建图像的分辨力都有不同程度的影响; 散射相机可以获得裂变中子源的能谱形状,但系统的结构、探测阈值等会使能谱测量造成一定的偏差。该理论工作的结论可推广到由更多单元组成的散射相机中使用。

Abstract

As a neutron detecting and imaging device used for detection of special nuclear material (SNM), the newly reported neutron scatter camera can acquire the neutron position and energy information simultaneously. In this paper, the particle transport code MCNP was used together with the program MATLAB and Fortran to simulate a five-units prototype of a neutron scatter camera, and to reconstruct the image and energy of a 252Cf neutron source. The calculation results show that the camera’s energy resolution is about 9% and its angular resolution is related to the size of the scintillators; when the neutron energy equals 2 MeV, the detection efficiency reaches a maximum; the distance of the source, the size of the scintillators, the distance between the front and rear surfaces of the detectors, and the number of the events have influence on the resolution of the image to a certain extent; the scatter camera can measure the fission neutron energy spectrum, but the factors such as the camera’s structure and detection threshold could result in some inaccuracy of the measurement. This simulation work lays a foundation for further experimental research, and its conclusion can be generalized to the neutron scatter camera with much units.

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中图分类号:TL816.3;TL817.3

DOI:10.3788/hplpb20122410.2464

所属栏目:粒子束技术

基金项目:国家自然科学基金项目(11105106)

收稿日期:2012-04-21

修改稿日期:2012-06-05

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作者单位    点击查看

张显鹏:西安交通大学 能源与动力工程学院, 西安 710049西北核技术研究所, 西安 710024
张美:西北核技术研究所, 西安 710024
盛亮:西北核技术研究所, 西安 710024
欧阳晓平:西北核技术研究所, 西安 710024

联系人作者:张显鹏(wetam@tom.com)

备注:张显鹏(1976—),男,副研究员,博士,主要从事脉冲辐射场诊断相关工作

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引用该论文

Zhang Xianpeng,Zhang Mei,Sheng Liang,Ouyang Xiaoping. Simulation research of neutron scatter camera with five units[J]. High Power Laser and Particle Beams, 2012, 24(10): 2464-2468

张显鹏,张美,盛亮,欧阳晓平. 5单元中子散射相机仿真研究[J]. 强激光与粒子束, 2012, 24(10): 2464-2468

被引情况

【1】张美,张显鹏,李阳,盛亮,李斌康,李奎念,张小东,魏福利,赵吉祯,袁媛. 一种用于中子散射成像的快速反投影重建方法. 强激光与粒子束, 2014, 26(5): 54003--1

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