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.  
Highlights
The detection of explosives and threat materials inside packages and luggage of an aircraft passenger has become an essential requirement that must be faced with a comprehensive technical solution, in order to preserve life and property, especially in light of the growing phenomenon of terrorism in recent days
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
For all detectors, no obvious difference between gamma spectra with and without explosive. This means that, secondary gamma rays produced from neutron interaction with elements constitute the shielding materials of the designed system mask gamma signals produced from neutron interaction with elements constitute the explosive materials
Summary
The detection of explosives and threat materials inside packages and luggage of an aircraft passenger has become an essential requirement that must be faced with a comprehensive technical solution, in order to preserve life and property, especially in light of the growing phenomenon of terrorism in recent days. The detection and identification of explosives by neutron and gammaray interrogation has been investigated for over six decades (McFee et al, 2013). Prompt gamma-ray neutron activation analysis (PGNAA) offers an on-stream, non-destructive, relatively rapid method for the determination of elemental composition of bulk samples on conveyor belts (Jiaxin et al, 2011). The objectives of this type of inspection are to look for explosives in objects as small as a briefcase and as large as a truck and marine shipping container (Tsahi and Dan, 2007).
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