摘要
为验证热中子分析(Thermal neutron analysis,TNA)方法用于地雷探测的可行性,探索并掌握该方法的技术特点。采用国产新型LaBr3(Ce)快闪烁体探测器,搭建了一套基于252Cf同位素中子源的热中子分析探雷实验系统,主要包含慢热中子转化系统、屏蔽系统、探测系统三个部分。在此基础上,研究了宽能量范围特别是对高能段的精确刻度方法,提出了基于N(H)元素10.83 MeV(2.22 MeV)特征信号计数异常的地雷最小可探测时间。在黄土、粘土、沙土以及磁性土的实验雷池中对72式反坦克地雷、500 g TNT样品以及多种干扰物进行了测试。结果表明,该套探雷实验系统可实现不同背景下的地雷探测,并能有效判弃传统探雷技术易产生虚警的干扰物。
Background： Recently, the prompt gamma-rays neutron activation analysis method is wildly used in coal analysis and explosive detection, however there were less application about landmine detection using neutron method especially in the domestic research. Purpose： In order to verify the feasibility of Thermal Neutron Analysis （TNA） method used in landmine detection, and explore the characteristic of this technology. Methods： An experimental system of TNA landmine detection was built based on LaBra（Ce） fast scintillator detector and 252Cf isotope neutron source. The system is comprised of the thermal neutron transition system, the shield system, and the detector system. Results： On the basis of the TNA, the wide energy area calibration method especially to the high energy area was investigated, and the least detection time for a typical mine was defined. In this study, the 72-type anti-tank mine, the 500 g TNT sample and several interferential objects are tested in loess, red soil, magnetic soil and sand respectively. Conclusions： The experimental results indicate that TNA is a reliable demining method, and it can be used to confirm the existence of Anti-Tank Mines（ATM） and large Anti-Personnel Mines（APM） in complicated condition.
出处
《核技术》
CAS
CSCD
北大核心
2013年第2期26-31,共6页
Nuclear Techniques
基金
总装备部探索一代资助项目
