Simulation on X-rays backscatter imaging based on Monte Carlo methods for security inspection

摘要

In order to defense drug-related and terrorist crimes effectively, and to safeguard homeland security as well as public safety, it is important to inspect drugs, explosives and other contraband quickly and accurately from the express, luggage, vehicles and other objects. X-ray backscatter imaging are significant methods for detecting drugs and plastic explosive in the field of security inspection. In this paper, we constructed an analytical model based on Monte Carlo algorithm. Based on the model, we analyzed the imaging contrasts aimed at detecting concealed contrabands. The results show that the better imaging contrast can be achieved while the energy of X-ray is above 100 keV, and the contrast varies less than 0.1 as the energy increases from 150 keV to 300 keV. Compared with traditional methods, our model involved multiple scattering effects, which is more accurate and complete. Through this method, we can not only calculate and analyze the image characteristics of large amounts of contrabands for various system structures, and can also design and optimize the instruments specially used to inspect drugs and explosives.