Distributed radiation source-based X-ray backscattering channel type vehicle security system and method

Abstract

The invention provides an X-ray backscattering channel type vehicle security system. The X-ray backscattering channel type vehicle security system includes an X-ray source, a collimation component and a plurality of detectors; the X-ray source is provide with a plurality of emergent target spots which are configured to independently emit X-rays; the collimation component is configured before the target spots to make a beam emitted by each target spot to emit at least two beams of pen-shaped X-rays after passing through the collimation component and make the at least two beams of pen-shaped X-rays projected to at least two positions of a detected object; and the plurality of detectors are configured to respectively receive corresponding scattering signals from the detected object simultaneously. With the X-ray backscattering channel type vehicle security system of the invention adopted, vehicles can be scanned twice at least in a single scanning process, and therefore, scan speed can be effectively improved, and single scan time can be shortened, and backscatter image signals can be enhanced.

Description

technical field [0001] The invention relates to the application field of nuclear technology imaging, in particular to an X-ray backscattering channel-type vehicle security inspection system and method based on distributed radiation sources. Background technique [0002] In the usual X-ray vehicle safety inspection system, the ray source and detector are placed on both sides of the vehicle, and the shape distribution of the material inside the vehicle is obtained by the transmission principle. This method has a strong ability to identify substances with medium, high density and high atomic number. However, for low-density, low-atomic-number substances such as explosives, drugs and other contraband, due to the low blocking efficiency of the object itself against X-rays, the difference in the gray level of the transmission image is small, and it is easy to cause missed detection. [0003] Utilizing the Compton scattering principle of the interaction between X-rays and matter, t...

AI Technical Summary

Problems solved by technology

[0005] The usual X-ray backscattering technology uses a single radiation source for detection. The disadvantage is that in order to make the ray scanning range cover the surface of the object as much as possible, the angular distribution of the outgoing X-rays is required to be large enough, or the distance between the radiation source and the object to be scanned must be large enough. Farther away

Therefore, for a single radiation source backscatter detection system, either because the opening angle is too large, the dose distribution of each outgoing beam is quite different, or because the distance is too long, the overall space occupied by the system is huge, and the information that the detector can receive becomes large. Less, resulting in poor spatial resolution

Based on the characteristics of backscattered flying spot scanning, generally only a single beam of pencil rays acts on the object at a certain moment during the scanning process, which limits the detection speed of backscattered scanning imaging

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