Radiation inspection system

Abstract

The invention provides a radiation inspection system which comprises a plurality of scanning devices, the plurality of scanning devices are arranged around an inspection channel so as to scan an inspected object in the inspection channel from different angles, each scanning device comprises a radiation source, a flywheel and a back scattering detector, and the radiation source, the flywheel and the back scattering detector are matched with each other so as to scan the inspected object in the inspection channel. Flying spot back scattering scanning is carried out on the detected object, the ray sources of the scanning devices carry out pulse beam output according to the preset beam output frequencies of the scanning devices, and the beam output time of the ray sources of the scanning devices is staggered, so that the ray sources of the scanning devices do not output beams at the same time. Therefore, a plurality of scanning devices can conveniently carry out flying spot back scattering scanning on the detected object at different times.

Description

Technical Field

[0001] The present application relates to the technical field of radiation inspection, and in particular to a radiation inspection system. Background Art

[0002] Some radiation inspection systems use multiple scanning devices to perform flying spot backscatter scanning on the inspected object at multiple viewing angles. In this case, in order to prevent mutual interference between different scanning devices, the multiple scanning devices usually do not perform flying spot backscatter scanning on the inspected object at the same time.

[0003] In the related art, the rotation speed and phase of the flywheel of each scanning device are generally controlled so that the radiation source of each scanning device does not pass through its own flywheel at the same time, so that multiple scanning devices do not scan the object to be inspected at the same time. However, this control method is difficult and costly. Summary of the invention

[0004] The present application aims to provide a radiation inspection system to facilitate multiple scanning devices to perform flying spot backscatter scanning on an object to be inspected at different times.

[0005] In order to achieve the above objectives, the present application provides a radiation inspection system, which includes:

[0006] A plurality of scanning devices are arranged around the inspection channel to scan the inspected object in the inspection channel from different angles. Each scanning device comprises a ray source, a flywheel and a backscatter detector. The ray source, the flywheel and the backscatter detector cooperate to perform flying point backscatter scanning on the inspected object. The ray source of each scanning device pulses out a beam according to its own preset beam emission frequency, and the beam emission timing of the ray source of each scanning device is staggered, so that the ray source of each scanning device does not emit beams at the same time.

[0007] In some embodiments, the radiation sources of each scanning device emit beams sequentially.

[0008] In some embodiments, the number of beams emitted by the ray source within the angular range is less than or equal to 1, or the number of beams emitted by the ray source within the angular range is greater than 1.

[0009] In some embodiments, the preset beam emission frequencies of the ray sources of each scanning device are the same or different.

[0010] In some embodiments, each scanning device further includes an angle detection component, which detects the rotation angle of the flywheel when the ray source emits a beam.

[0011] In some embodiments, the angle detection component is disposed on the flywheel.

[0012] In some embodiments, the angle detection component includes an angle sensor, an encoder, a grating ruler or a visual detection component.

[0013] In some embodiments, at least one scanning device includes a transmission detector, which cooperates with a radiation source to perform a transmission scan on the object under inspection.

[0014] In some embodiments, each scanning device includes a transmission detector.

[0015] In some embodiments, the radiation inspection system includes at least three scanning devices.

[0016] By setting the ray sources of multiple scanning devices performing multi-angle flying spot backscatter scanning as pulsed ray sources and making each ray source emit beams at different times according to its own preset beam emission frequency, it is convenient for multiple scanning devices to perform flying spot backscatter scanning on the object to be inspected at different times.

[0017] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a simplified structural diagram of the radiation inspection system in the first embodiment of the present application.

[0020] Figure 2 This is a simplified structural diagram of the flywheel in the first embodiment of the present application.

[0021] Figure 3 Schematic diagram of the beam-emitting relationship between ray sources in the first embodiment of the present application.

[0022] Figure 4 This is a simplified structural diagram of the radiation inspection system in the second embodiment of the present application. Description of reference numerals:

[0023] 10. Scanning device;

[0024] 1. ray source; 11. first ray source; 12. second ray source;

[0025] 2. Flywheel; 23. Collimation port; 24. Angle detection component;

[0026] 3. Backscatter detector;

[0027] 4. Check the channel;

[0028] 5. The subject of inspection. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of this application.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0031] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0032] In the description of the present application, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present application.

[0033] In the present application, unless otherwise specified, “plurality” means at least two, that is, including cases of two and at least three.

[0034] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0035] Radiation inspection system is a device that uses scanning devices to scan and inspect objects such as vehicles, containers and aircraft in customs and airports to obtain images. From the perspective of imaging principle, scanning devices are mainly divided into transmission type, backscatter type and transmission-backscatter combination type.

[0036] Among them, backscatter imaging technology uses the Compton scattering effect to capture the photons reflected by the object under inspection. The scattered image is formed by the radiation signal scattered by the object at a certain depth close to the backscatter detector. Since the Compton scattering of radiation in low atomic number materials such as explosives and drugs is stronger, backscatter imaging technology can distinguish materials and highlight organic substances. It has the advantages of low radiation dose, sensitivity to light materials, and intuitive images.

[0037] Flying spot backscatter imaging technology is a typical backscatter imaging technology. Figure 1 A scanning device 10 using a flying spot backscatter imaging technique generally comprises a ray source 1, a flywheel 2 and a backscatter detector 3. The ray source 1 is disposed on one side of an object 5 to be inspected and is used to emit rays to the object 5 to be inspected. The flywheel 2 is rotatably disposed between the ray source 1 and the object 5 to be inspected and has a collimation port 23 for the rays to pass through, so as to chop a fan-shaped light beam emitted from the ray source 1 to the object 5 to be inspected and form a fine light beam (i.e., a flying spot). The corresponding fine light beam is irradiated onto the object 5 to generate backscatter rays. The backscatter detector 3 is disposed on the same side of the object 5 to be inspected and receives the backscatter rays generated by the fine light beam irradiating onto the object 5 to be inspected, converts the optical signal into an electrical signal, and reconstructs the image by the imaging device.

[0038] In order to realize the flying spot backscatter scanning at different angles of the object under inspection 5, see Figure 2 and Figure 4 In some radiation inspection systems, a plurality of scanning devices 10 are provided, and the plurality of scanning devices 10 are arranged around the inspection channel 4 to perform flying spot backscatter scanning on the inspected object 5 located in the inspection channel 4 from different angles, thereby forming a multi-viewing angle (i.e., at least two viewing angles) flying spot backscatter scanning system.

[0039] For the above-mentioned multi-view flying spot backscatter scanning system, in order to prevent mutual interference between different scanning devices 10 and affect the imaging quality, it is usually required that the scanning devices 10 scan the object 5 at different times.

[0040] In the related art, the rotation speed and phase of the flywheel 2 of each scanning device 10 are generally controlled to prevent the multiple scanning devices 10 from performing flying spot backscatter scanning on the object 5 at the same time. Specifically, the rotation speed of the motor driving each flywheel 2 is generally controlled to match the rotation speeds of the flywheels 2. For example, the rotation speeds of the flywheels 2 are synchronized in time division, so that the ray sources 1 of each scanning device 10 do not emit rays from the flywheel 2 at the same time, and thus the multiple scanning devices 10 do not perform flying spot backscatter scanning on the object 5 at the same time. Moreover, it is necessary to make the time period deviation of each flywheel emitting rays have a fixed phase relationship.

[0041] However, matching the rotation speed and phase between different flywheels 2 requires coordinated control of the rotation speed and phase, which is difficult and costly. In addition, due to the constraints of motor stability, the rotation speed of the flywheel 2 is difficult to remain constant for a long time and is prone to change. Even if the rotation speeds of different flywheels 2 can be matched well, the rotation speeds of some flywheels 2 may change during subsequent work, causing some scanning devices 10 to scan the object 5 at the same time, interfering with each other and affecting imaging, which further increases the control difficulty and increases the control cost.

[0042] The above problem becomes more serious when the speed of the flywheel 2 is higher. That is to say, the higher the speed of the flywheel 2, the more difficult it is to control, the higher the cost, and the higher the requirements for the motor. This also limits the increase in the speed of the flywheel 2 and affects the efficiency.

[0043] It can be seen that it is difficult to conveniently realize the flying spot backscatter scanning of the inspected object 5 at different times by each scanning device 10 by matching the rotation speeds of different flywheels 2, which affects the inspection accuracy and efficiency.

[0044] In view of the above situation, the present application provides a radiation inspection system.

[0045] Figure 1-Figure 4 The structure of the radiation inspection system in the present application is shown exemplarily.

[0046] See also Figure 1-Figure 4 In the present application, the radiation inspection system includes a plurality of scanning devices 10, which are arranged around the inspection channel 4 to scan the inspected object 5 located in the inspection channel 4 from different angles. Each scanning device 10 includes a radiation source 1, a flywheel 2 and a backscatter detector 3. The radiation source 1, the flywheel 2 and the backscatter detector 3 cooperate to perform flying point backscatter scanning on the inspected object 5. The radiation source 1 of each scanning device 10 pulses out a beam according to its own preset beam emission frequency, and the beam emission timing of the radiation source 1 of each scanning device 10 is staggered, so that the radiation source 1 of each scanning device 10 does not emit beams at the same time.

[0047] In the above scheme, since the scanning device 10 includes a radiation source 1, a flywheel 2 and a backscatter detector 3 that cooperate with each other to perform flying spot backscatter scanning on the inspected object 5, and the radiation inspection system includes a plurality of scanning devices 10 arranged around the inspection channel 4, the radiation inspection system is a multi-view flying spot backscatter scanning system, and since the radiation source 1 of each scanning device 10 pulses out beams according to its own preset beam-out frequency, and the beam-out timing of the radiation source 1 of each scanning device 10 is staggered, it is only necessary to control the beam-out timing of each radiation source 1 without controlling the rotation speed and phase matching between the flywheels 2, so that each scanning device 10 can be controlled to perform flying spot backscatter scanning on the inspected object 5 at different times (or called time-sharing or staggered time), thereby effectively reducing the control difficulty and cost, making it more convenient to make multiple scanning devices 10 perform flying spot scanning on the inspected object 5 at different times. Backscatter scanning, in this way, not only can the image quality of multi-angle flying spot backscatter scanning be effectively improved based on a simpler control process and lower cost, and the accuracy of the inspection result be improved, but also, the rotation speed and phase matching between the flywheels 2 are not controlled, that is, the time-sharing scanning of each scanning device 10 performing the flying spot backscatter scanning is realized, and the control requirements for the rotation speed of the flywheel 2 can also be reduced. On the one hand, it is convenient to adjust the rotation speed of the flywheel 2 according to the real-time relative movement speed between the inspected object 5 and the radiation inspection system, so that the rotation speed of the flywheel 2 is more matched with the relative movement speed of the inspected object 5 and the radiation inspection system, and a more accurate scanning inspection process is realized. On the other hand, even if the rotation speed of the flywheel 2 is accelerated, it will not increase the control difficulty of the scanning devices 10 emitting beams at different times. Therefore, it is also beneficial to increase the rotation speed of the flywheel 2, improve the working efficiency of the radiation inspection system, and improve the image quality.

[0048] The ray sources 1 of each scanning device 10 emit pulsed beams according to their respective preset beam emission frequencies, which means that each ray source 1 is a pulsed ray source. Since a pulsed ray source is a discontinuous beam emission ray source, its high level of beam emission and low level of no beam emission appear alternately in sequence. Therefore, when the ray source 1 is a pulsed ray source, it is more convenient to stagger the beam emission timings of different ray sources 1, so as to achieve different beam emission times between different ray sources 1.

[0049] Since each ray source 1 always emits a beam according to its own preset beam emission frequency, the beam emission timings of each ray source 1 are staggered, and no external triggering is required. Therefore, this beam emission mode that does not require external triggering but only needs to be pre-programmed to stagger the beam emission timings of each ray source 1 can be called an internally triggered time-sharing (or staggered) beam emission mode. The corresponding internally triggered time-sharing beam emission mode is used to make each ray source 1 emit beams at different times. Since there is no need to set up an additional trigger component to trigger the ray source 1 to emit beams, the structure is relatively simple.

[0050] It can be seen that by setting the radiation sources 1 of multiple scanning devices 10 that perform multi-angle flying spot backscatter scanning as pulse radiation sources, and making each radiation source 1 emit beams at a different time according to its own preset beam emission frequency, multi-angle time-sharing flying spot backscatter scanning can be easily achieved, effectively improving the inspection accuracy and inspection efficiency.

[0051] The preset beam emission frequencies of the ray sources 1 of each scanning device 10 may be the same or different. When the preset beam emission frequencies of the ray sources 1 of each scanning device 10 are the same, the control is simpler, and it is conducive to making the beam emission of each ray source 1 more uniform, thereby achieving better imaging effect.

[0052] In some embodiments, the ray sources 1 of each scanning device 10 emit beams in sequence. In this case, it is only necessary to set the beam emission sequence of each ray source 1 in the controller in advance so that each ray source 1 emits beams in sequence according to the preset sequence, so that the beam emission timings of different ray sources 1 can be staggered, and the beam emission of different ray sources 1 can be achieved at different times, which is simpler and more convenient.

[0053] In the above embodiments, each ray source 1 has an angle range of The number of beams emitted within the range may be less than or equal to 1, or may be greater than 1. When the number of beams emitted by the ray source 1 within the range of the angle is less than or equal to 1, it indicates that the frequency of the beams emitted by the ray source 1 is low (for example, less than 60,000 Hz), and when the number of beams emitted by the ray source 1 within the range of the angle is greater than 1, it indicates that the frequency of the beams emitted by the ray source 1 is high. Compared with the former, the latter emits beams at a high frequency (for example, greater than or equal to 60,000 Hz). In this case, the imaging can be reconstructed without splicing the images, which effectively reduces the difficulty of imaging and facilitates imaging. In addition, the high frequency beam emission of the ray source 1 also facilitates that no matter how the speed of the flywheel 2 is, there is always a collimation port 23 within the range of the angle, so the control requirements for the speed of the flywheel 2 can be further reduced.

[0054] As a further improvement to the above embodiments, see Figure 2 Each scanning device 10 further includes an angle detection component 24 (such as an angle sensor, an encoder, a grating ruler or a visual detection component), and the angle detection component 24 detects the rotation angle of the flywheel 2 when the ray source 1 emits a beam. In this way, the rotation angle of the flywheel 2 when the ray source 1 emits a beam can be easily determined. Since the corresponding information is used in image reconstruction, it is convenient to determine the image, so the imaging difficulty can be further reduced and the imaging quality can be improved.

[0055] Specifically, see Figure 2 In some embodiments, the angle detection component 24 (eg, an angle sensor) is disposed on the flywheel 2. In this way, it is more convenient to accurately detect the rotation angle of the flywheel 2, reduce the difficulty of imaging, and improve the imaging quality.

[0056] In the aforementioned embodiments, at least one scanning device 10 may include a transmission detector (not shown), which cooperates with the radiation source 1 to perform transmission scanning on the object 5 to be inspected, so that a transmission image and a backscattered image can be obtained simultaneously by using the flying spot.

[0057] For example, in some embodiments, each scanning device 10 includes a transmission detector, so that each viewing angle can obtain a transmission image and a backscattered image using a flying spot, which is beneficial to further improve the accuracy of the inspection result.

[0058] In addition, in the aforementioned embodiment, the number of scanning devices 10 in the radiation inspection system is not limited, and can be two, three or more. When the radiation inspection system includes at least three scanning devices 10, it can realize scanning of at least three viewing angles of the inspected object 5, with higher scanning accuracy, smaller error, and stronger data integrity. Moreover, compared with the case where only two scanning devices 10 are included and only two viewing angles of flying spot backscatter scanning are performed, when the radiation inspection system includes at least three scanning devices 10 and scans at least three viewing angles, it is more difficult to control the time-sharing scanning of different viewing angles by matching the rotation speed and phase between the flywheels 2. Therefore, the advantage of using the internal trigger time-sharing beam-emitting method of the present application is more obvious.

[0059] Next, combine Figure 1-Figure 4 The embodiments shown are used to further introduce the present application.

[0060] First, let’s introduce Figure 1-Figure 3 The embodiment shown.

[0061] like Figure 1 As shown, in this embodiment, the radiation inspection system has an inspection channel 4, which is formed by a bracket (such as a gantry) and is used for the inspection object 5 to pass through. In this embodiment, the inspection object 5 is a vehicle, which moves through the inspection channel 4, and the radiation inspection system does not move in the moving direction of the inspection object 5, thereby achieving relative movement between the inspection object 5 and the radiation inspection system, so that the radiation inspection system scans and inspects different parts of the inspection object 5 in the moving direction (or the length direction or depth direction of the inspection channel 4).

[0062] In this embodiment, the radiation inspection system includes two scanning devices 10, which are arranged above and to the side of the inspection channel 4, respectively, and each includes a radiation source 1, a flywheel 2 and a backscatter detector 3. The radiation source 1 and the backscatter detector 3 are arranged on the same side of the inspection channel 4, and are respectively used to emit radiation to the object 5 to be inspected in the inspection channel 4, and receive backscattered radiation reflected from the object 5 (such as a vehicle). The flywheel 2 is rotatably arranged, and collimates the radiation emitted from the radiation source 1 to the object 5 to be inspected, so as to obtain a thin beam for flying spot backscatter scanning.

[0063] Figure 2 The structure of the flywheel 2 in this embodiment is further shown. Figure 2 It can be seen that in this embodiment, at least one (four are used as an example in the figure) collimation port 23 is provided on the flywheel 2 for the rays to pass through so as to collimate the rays. During the rotation of the flywheel 2, there is only one collimation port 23 located within the range of the ray opening angle α at the same time, so that when the fan-shaped ray beam passes through the corresponding collimation port 23, a thin beam can be formed to perform high-speed scanning on the inspected object 5 in a plane perpendicular to the moving direction. At the same time, through the relative movement of the inspected object 5 and the radiation inspection system, a two-dimensional flying spot backscatter scanning of the inspected object 5 can be achieved, and a flying spot backscatter scanning image of the inspected object 5 can be obtained.

[0064] It can be seen that in this embodiment, the two scanning devices 10 can respectively perform flying spot backscatter scanning at the top viewing angle and the side viewing angle, so that the radiation inspection system becomes a dual-viewing angle flying spot backscatter scanning system.

[0065] In order to prevent the scanning processes of the two perspectives from interfering with each other, affecting the imaging quality and the accuracy of the inspection results, such as Figure 3 As shown, in this embodiment, the ray sources 1 of the two scanning devices 10 are respectively called the first ray source 11 and the second ray source 12, and both are pulsed ray sources. The two emit pulsed beams according to the same preset beam frequency, and the pulse widths of the two are equal, but the two do not emit beams at the same time, but emit beams alternately in sequence. For example, the first ray source 11 emits a beam first, and when the first ray source 11 emits a beam, the second ray source 12 does not emit a beam, the first ray source 11 ends the beam emission, and the second ray source 12 then emits a beam, and when the second ray source 12 emits a beam, the first ray source 11 does not emit a beam, the second ray source 12 ends the beam emission, and the first ray source 11 emits a beam again... and so on. In this case, the high and low levels of the first ray source 11 and the second ray source 12 are opposite.

[0066] Since the ray sources 1 of the two viewing angles are both pulse ray sources, and the two emit beams alternately in sequence according to the same preset beam emission frequency, it is only necessary to pre-set the beam emission timing of the two ray sources 1 in the controller so that the high and low levels of the two ray sources 1 are opposite, so that the two ray sources 1 can emit beams at different times during the operation of the radiation inspection system, thereby controlling the scanning of the two viewing angles to be performed at different times. In this case, there is no need to perform matching control of the rotation speed and phase between the two flywheels 2. Therefore, it is simple, convenient and low-cost, and can effectively prevent the scanning of the two viewing angles from being performed simultaneously due to changes in the rotation speed and / or phase of the two flywheels 2, thereby interfering with each other and affecting the imaging. In addition, it is beneficial to increase the rotation speed of the flywheel 2 and improve the working efficiency of the radiation inspection system. At the same time, it is also beneficial to reduce the requirements for the motor that drives the flywheel 2 to rotate, so that various types of motors can be used to drive the flywheel 2 to rotate.

[0067] Back to Figure 2 In this embodiment, an angle detection component 24 is provided on the flywheel 2, and the corresponding angle detection component 24 detects the rotation angle of the flywheel 2 when the ray source 1 emits a beam. In this way, the angular position information of the flywheel 2 can be accurately determined each time the ray source 1 emits a beam, thereby making image reconstruction more convenient.

[0068] Next, let’s introduce Figure 4 The embodiment shown. It should be noted that, Figure 4 The backscatter detector 3 of each scanning device 10 is not shown.

[0069] like Figure 4 As shown, this embodiment is similar to the aforementioned Figure 1-Figure 3 The difference between the embodiment shown is that the radiation inspection system no longer includes only two scanning devices 10, but includes more (eight in the figure as an example) scanning devices 10. In this way, the radiation inspection system can perform flying spot backscatter scanning at more viewing angles on the object 5 to be inspected, and the imaging quality is higher. However, in this embodiment, the radiation source 1 of each scanning device 10 is different from the scanning device 10. Figure 1-Figure 3 The two ray sources 1 in the illustrated embodiment are the same, both are pulse ray sources, and different ray sources 1 still emit beams alternately in sequence according to the same preset beam emission frequency.

[0070] Generally, the more viewing angles there are, the more difficult it is to match the rotation speed and phase between the flywheels 2. For this reason, this embodiment adopts an internal trigger time-sharing beam-emitting method for flying spot backscatter scanning at more viewing angles, which has a more obvious effect and is more conducive to reducing the control difficulty and cost. It can effectively improve the image quality of flying spot backscatter scanning at more viewing angles based on a simpler control process and cost, and improve the accuracy of the inspection results.

[0071] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A radiation inspection system, characterized in that: include: A plurality of scanning devices (10) are arranged around an inspection channel (4) to scan an object to be inspected (5) located in the inspection channel (4) from different angles. Each of the scanning devices (10) comprises a ray source (1), a flywheel (2) and a backscatter detector (3). The ray source (1), the flywheel (2) and the backscatter detector (3) cooperate to perform flying point backscatter scanning on the object to be inspected (5). The ray source (1) of each scanning device (10) emits a pulse beam according to its own preset beam emission frequency, and the beam emission timing of the ray source (1) of each scanning device (10) is staggered, so that the ray source (1) of each scanning device (10) does not emit beams at the same time.

2. The radiation inspection system according to claim 1, characterized in that: The radiation sources (1) of the scanning devices (10) emit beams in sequence.

3. The radiation inspection system according to claim 1, characterized in that: The number of beams emitted by the ray source (1) within the range of the angle of aperture is less than or equal to 1, or the number of beams emitted by the ray source (1) within the range of the angle of aperture is greater than 1.

4. The radiation inspection system according to claim 1, characterized in that: The preset beam emission frequencies of the ray sources (1) of the scanning devices (10) are the same or different.

5. The radiation inspection system according to claim 1, characterized in that: Each of the scanning devices (10) further comprises an angle detection component (24), wherein the angle detection component (24) detects the rotation angle of the flywheel (2) when the ray source (1) emits a beam.

6. The radiation inspection system according to claim 6, characterized in that: The angle detection component (24) is arranged on the flywheel (2).

7. The radiation inspection system according to claim 6, characterized in that: The angle detection component (24) comprises an angle sensor, an encoder, a grating ruler or a visual detection component.

8. The radiation inspection system according to claim 1, characterized in that: At least one of the scanning devices (10) comprises a transmission detector, and the transmission detector cooperates with the radiation source (1) to perform transmission scanning on the object to be inspected (5).

9. The radiation inspection system according to claim 8, characterized in that: Each of the scanning devices (10) comprises the transmission detector.

10. The radiation inspection system according to any one of claims 1 to 9, characterized in that: The radiation inspection system comprises at least three scanning devices (10).

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