Hypothetical system dosimetry calculations PGNAA by using ORNL-MIRD phantom and Monte Carlo computational code

Increasing growth of terrorist activities and threats to date and illegal transit of cargo led to the discovery and detection systems, have a lot of development. In this paper, to discovery and detection material has been used Prompt Gamma Neutron Activation Analysis (PGNAA) technique. Besides using simulated hypothetical system should also pay special attention to safety radiation and considerations related to the physics of health issues. If the amount of dose is relatively large, appeared deterministic effects and probable effects may occur at all radiation levels. Therefore, to determine allowable and protected region, to move personnel and public has been used ORNL-MIRDphantom. ORNL-MIRD Phantom provides analytical model of the human body. Calculation of doses in organs requests an exact description of the geometry of organs and the chemical constitution of tissues. At the available hypothetical system, the source and NaI detector has been used as neutron generator and emitted gamma receiver respectively. MCNPX2.7 code has been exploited to simulate neutron - photon transport in this system. Considering the details of the existing system to work with the system, protected region within a radius of 70 cm and the allowable region for radiographers were to 130 cm radius. Also the designed system is capable to detecting HMX explosive with weights of 158 gr and 501 gr at 10 and 1 minute respectively.