标记中子法检测墙体内爆炸物  

A Movable Device for Detection of Explosive Embedded in a Wall

作　　者：王强[1] 景士伟[1,2] 郑玉来[1] WANG Qiang;JING Shi-wei;ZHENG Yu-lai(China Institute of Atomic Energy,Beijing 100010,China;Northeast Normal University,Changchun 130024,China)

机构地区：[1]中国原子能科学研究院,北京100010 [2]东北师范大学,长春130024

出　　处：《核电子学与探测技术》2018年第1期1-4,共4页Nuclear Electronics & Detection Technology

摘　　要：介绍了标记中子法检测墙体内爆炸物的检测方法。通过时间谱的精细选择,对特定时间窗内!谱进行分析,将C、N、O等主要元素的特征谱进行精确计算和测量,利用序贯分析解决高密度墙体干扰、特征峰区分困难问题。对10 cm和15 cm厚墙体后面放置300 g硝铵、TNT炸药模拟样品进行探测,检测时间最长为10 min,正确检出率可达到80%以上。It is a new form of terrorism threat that the explosives beforehand hidden in the building wall will be detonated at the appropriate time by terrorists. A movable device for detection of explosives embedded in the wall is developed to against such new threats. Compared with other fast neutron detection techniques, the tagged neutron method （TNM） applied in this device can provide the 3D image of the object under interrogation. Meanwhile it can reduce the background by 200- 300 times of magnitude, and greatly improve the signal noise ratio （SNR） of the system. Also it can improve the accuracy and reduce the measurement time. The right decision rate for 300 g ammonium nitrate and TNT explosive simulated samples placed behind the 15 cm-thick wall are 90% and 80%, respectively, when the detection time is 10 mins and the neutron intensity is 1×107 n/s.

关 键 词：标记中子方法 爆炸物 墙体 硅酸钇镥 序贯分析 

分 类 号：O571.33[理学—粒子物理与原子核物理]