Abstract
The problem of explosive detection has become more acute over the last 10-15 years. Many attempts have been made to use thermal neutron activation analysis (TNA) to develop multi-purpose devices. The devices built upon that principle detect a greater (compared to the standard one) level of nitrogen concentration, which is common to all widely used explosive substances. The Explosive Detection Devices (EDD) use a thermal neutron flux to irradiate the inspected objects. When nitrogen nuclei capture thermal neutrons, characteristic gamma rays are emitted with energy 10.8 MeV. Monitoring of gamma radiation enables one to determine nitrogen concentration in the examined objects.
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