Abstract
In this study an explosive detection system to investigate luggage of air travelers by the Monte Carlo N-Particle Transport code (MCNP5) has been designed. Concrete as a commonly shielding material was the main part in the designed system. Pulsed neutron generator with 14.1 MeV neutrons was used as a neutron source. Two time gates were used in gamma detection process. The lead was used as a secondary gamma rays shielding material for the sake of background reduction. The equivalent dose outside the designed system was less than the accepted level. Gamma signals from different weights of explosives 1.833, 1.173, 0.815 and 0.399 kg at different detector positions were calculated. The results show that the designed system can be provide a reasonable values of signal-to-background ratio from the explosive basic elements constitute, C, O and N.
Key words: 14 MeV neutron, design, explosive, gamma radiation, lead, Monte Carlo calculation, neutron irradiation.
