Unisource X-ray transmission and compton scattering security check device in L-shaped structure

Abstract

Provided is a unisource X-ray transmission and compton scattering security check device in an L-shaped structure. An X-ray source is shared for transmission measurement and compton scattering measurement. An industrial personal computer is shared for measurement control. A thick radiation shield layer is arranged between a compton scattering detector and an L-shaped transmission detector. A transmission measuring and imaging geometry structure is formed by the X-ray source and an L-shaped structure transmission detector array. A back scattering measuring and imaging geometry structure is formed by a back scattering parallel photon beam and a compton back scattering detector array, wherein the back scattering parallel photon beam passes through a rear collimator and is ejected after a sector-shaped transmission photon beam passes through a to-be-measured object. A front scattering measuring and imaging geometry structure is formed by a front scattering parallel photon beam and a compton front scattering detector array, wherein the front scattering parallel photon beam passes through the rear collimator and is ejected after the sector-shaped transmission photon beam passes through the to-be-measured object. The unisource X-ray transmission and compton scattering security check device is cheap in price, quick in detection speed and high in sensitivity, can be used for simultaneously detecting different types of prohibited goods such as metal weapons, explosives and narcotics, and is suitable for important large security check occasions.

Description

1. Technical field [0001] The patent of the present invention relates to an X-ray security inspection system, specifically an L-shaped structure single-source X-ray transmission and Compton scattering security inspection device used on a luggage security inspection machine and a detection method thereof. 2. Background technology [0002] 1. X-ray transmission method: [0003] This method is commonly used at home and abroad. Due to the absorption of X-rays by substances, a part of the energy will be absorbed when X-rays pass through the object to be inspected. Different types of materials have different absorption capabilities for X-rays. The energy of the X-ray beam when it reaches the detector is also different. After processing, the amount of energy received by the detector is displayed in grayscale images. This method can only detect metal weapons, knives, etc., which has great limitations. [0004] 2. Dual-energy X-ray transmission method: [0005] In recent years, th...

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Problems solved by technology

However, the detection effect of this X-ray backscatter security inspection device is still insufficient. The most serious accident is: during the Olympic Games in Atlanta, the use of this backscatter security inspection device failed to detect explosives and caused an on-site explosion.

The United States has recently developed and produced backscatter human body inspection equipment. In 2010 alone, 450 of the 78 airports in the United States will be installed. The structure is complex, the detection speed is slow, and the price is expensive. It is difficult to popularize and apply in developing countries.

[0007] 4. X-ray computed tomography (CT) method: This method is suitable for large luggage packages. The CTX9000 luggage inspection system produced by General Intelligent Technology Company of the United States and the 3DX explosives detection system produced by L-3CSDS Company of the United States have complex structures.

[0009] Sichuan University cooperated with relevant units to develop a desktop security inspection machine combining γ-ray transmission and backscattering for the first time in China. Due to the radiation safety protection and storage problems of γ-radiation sources, the public’s poor recognition of this security inspection machine makes it difficult to use. Promote application

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