<p>A prompt gamma neutron activation analysis (PGNAA) system based on deuterium-deuterium (D-D) sealed neutron generator was designed using MOCA code for explosive detection. The system is mainly composed of four parts: D-D sealed neutron generator, moderator, shielding, Lutetium Yttrium OxyorthoSilicate (LYSO) scintillation detectors. Polyethylene (PE) was selected as moderator. Lead, Polyethylene and boron containing polyethylene were used as shielding materials. A simple model was used to calculate the nitrogen peak count of TNT samples with different PE moderator thickness by LYSO detector. Through simulation calculation, the optimal thickness of polyethylene is 7cm, and the detection efficiency of the system is the highest. In the optimized model, the LYSO detector is used to measure eighteen materials, such as wood, melamine, glucose, and nylon and so on. Firstly, the nitrogen characteristic peak of 10.8 MeV was analyzed to determine whether the material contained nitrogen. Then, the ratio of characteristic peak counts C/O and O/N were calculated to distinguish explosives from nitrogen containing materials. Finally, dinitrobenzene, nitroglycerin, TNT and ammonium nitrate can be separated from nitrogenous substances by a discriminant algorithm. The final device can be used to detect the chemical composition of the threat substances, and the maximum dose rate of the system meets the limits of international protection standards.</p>

Simulation Research on Explosives Detection System Based on D-D Sealed Neutron Generator

Paper Proceedings: https://asmedigitalcollection.asme.org/POWER/POWER2021/volume/85109

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