A landmine detection system based on D-T sealed neutron generator was set up to verify the validity of fast neutron analysis (FNA) for landmine detection. The results of experiment and MCNP5 simulation prove that the capacity of FNA for landmine detection is greatly limited due to its high background radiation levels. Inspired by previous efforts, the application of tagged neutron method (TNM) for landmine detection was investigated and modeled by MCNPX code. The gamma spectra of graphite sample were compared at different time windows. The appropriate selection of time window is effective for the landmine location and the background suppression. The influence of the soil humidity was studied for the landmine buried at different depths. The simulation results showed that the peak area ratio of C/Si and C/O can be used to effectively identify explosive materials in the detection area.

建立了基于DT密封中子发生器的地雷探测系统，以验证快速中子分析（FNA）对地雷探测的有效性。实验和MCNP5仿真结果表明，FNA的背景辐射水平高，极大地限制了地雷探测能力。受以前的努力启发，通过MCNPX代码研究了标记中子法（TNM）在地雷探测中的应用。在不同的时间窗口比较了石墨样品的伽马光谱。时间窗口的适当选择是有效的地雷位置和背景抑制。研究了土壤湿度对埋在不同深度的地雷的影响。