D-T中子源束斑尺寸测量技术及应用  

Beam Spot Size Measurement Technology and Application for D-T Neutron Source

作　　者：张凯[1] 侯龙[1] 陈红涛[1] 鲍杰[1] 苏明 阮念寿 赵芳[1] ZHANG Kai;HOU Long;CHEN Hongtao;BAO Jie;SU Ming;RUAN Nianshou;ZHAO Fang(Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China;Institute of Special Materials,China Academy of Engineering Physics,Mianyang 621000,China)

机构地区：[1]中国原子能科学研究院核数据重点实验室,北京102413 [2]中国工程物理研究院材料研究所,四川绵阳621000

出　　处：《原子能科学技术》2020年第12期2289-2295,共7页Atomic Energy Science and Technology

基　　金：中国原子能科学研究院院长基金资助项目(YZ201917)。

摘　　要：D-T中子发生器作为高能中子源,已用于特种核材料的有源探测技术中,利用时间符合法可实现被测物体的多模式成像,而中子源束斑尺寸是影响成像位置分辨的一个重要的因素。因此,结合D-T反应的特点和实际应用环境,开发了n-α关联符合测量确定中子源束斑尺寸的方法。利用该方法对小型移动中子发生器的束斑尺寸进行了测量,获得的束斑尺寸为(2.8±0.9)mm,与用CCD相机直接观测得到的约3 mm的测量结果一致,证明了该方法测量束斑尺寸的可行性。该方法也可用于辅助D-T中子源调束和关联粒子成像实验过程中的束斑监测。As a high-energy neutron source,the D-T neutron generator has been used in the active detection technology of special nuclear materials.The time coincidence method can be used to achieve multi-mode imaging of the measured object,and the beam spot size of the neutron source is a very important factor that affects the imaging position resolution.Therefore,combined with the characteristics of D-T reaction and practical application environment,a method for n-αcorrelation coincidence measurement to determine the beam spot size of neutron source was developed.This method was used to measure the beam spot size of a small mobile neutron generator.The beam spot size obtained is(2.8±0.9)mm,which is consistent with the measurement result of about 3 mm obtained by direct observation with CCD camera,which proves that this method is feasible.This method can also be used to assist D-T neutron source beam tuning and beam spot size monitoring in associated particle imaging experiments.

关 键 词：D-T中子源 束斑尺寸测量 关联粒子成像 位置灵敏探测器 

分 类 号：O571[理学—粒子物理与原子核物理]