CN115884485A - Radiation source and radiation inspection system - Google Patents
Radiation source and radiation inspection system Download PDFInfo
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- CN115884485A CN115884485A CN202211742642.XA CN202211742642A CN115884485A CN 115884485 A CN115884485 A CN 115884485A CN 202211742642 A CN202211742642 A CN 202211742642A CN 115884485 A CN115884485 A CN 115884485A
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Abstract
Providing a radiation source comprising a reflective accelerator comprising a target, the reflective accelerator configured to: responding to electron beams to bombard the target, emitting X-ray beams, wherein in the reflection type accelerator, the electron beams are incident on the target along a first direction, the X-ray beams are emitted from the target along a second direction, the first direction and the second direction are both positioned on the same side of the target, a first set included angle exists between the first direction and the second direction, and the first set included angle is between 20 degrees and 160 degrees. A radiation inspection system based on the radiation source is also provided.
Description
Technical Field
The embodiment of the disclosure relates to the field of electron accelerators and safety inspection, in particular to a radiation inspection system for performing safety inspection based on a radiation source of a reflection type accelerator.
Background
Various transportation vehicles (such as van trucks or container trucks) have the characteristics of high maneuverability, strong cargo concealment and the like, and become one of the key objects of safety inspection and explosion elimination work. With the improvement of imaging index requirements on the penetration capability and heavy metal identification capability of a safety inspection system, an accelerator gradually becomes a main stream radiation source core device of the inspection system. Safety inspection devices such as radiation sources and radiation inspection systems are key technical products for safety inspection of objects to be inspected, and can clearly, accurately and effectively distinguish objects in a carriage or a container, so that safety inspection efficiency can be improved and public safety can be guaranteed.
However, it is difficult for the current radiation source and radiation inspection system to simultaneously satisfy the high standards of technical indexes such as penetration, silk resolution, and substance class identification capability.
Disclosure of Invention
Embodiments of the present disclosure may address at least one of the above problems and disadvantages in the related art.
According to an embodiment of one aspect of the present disclosure, there is provided a radiation source characterized in that the radiation source comprises a reflex accelerator including a target, the reflex accelerator being configured to: responding to electron beams bombarding a target, emitting X-ray beams, wherein in the reflection type accelerator, the electron beams are incident on the target along a first direction, the X-ray beams are emitted from the target along a second direction, the first direction and the second direction are both positioned at the same side of the target, a first set included angle exists between the first direction and the second direction, and the first set included angle is between 20 degrees and 160 degrees.
According to an embodiment of the present disclosure, the reflex accelerator further includes an electron gun, and an accelerating device. The electron gun is used for emitting an electron beam with first set electron energy; the accelerating device is used for accelerating the electron beam with first set electron energy, wherein the electron beam emitted by the electron gun is accelerated by the accelerating device and then enters the target along a first direction, a second set included angle exists between the first direction and the normal direction of the target plane, and the second set included angle is 10-80 degrees.
According to an embodiment of the present disclosure, a third set angle exists between the second direction and the normal direction of the target plane, and a sum of the third set angle and the second set angle is the first set angle.
According to one embodiment of the present disclosure, the reflective accelerator emits an X-ray beam having a continuous energy spectrum, the X-ray beam includes a first X-ray beam having a first energy and a second X-ray beam having a second energy, the first energy is in a range of 0 to 200keV, the second energy is in a range of greater than 200keV, and the first X-ray beam accounts for a greater proportion of the second X-ray beam in the X-ray beam emitted by the reflective accelerator.
According to one embodiment of the present disclosure, the accelerating device includes an accelerating tube and a microwave device connected to the accelerating tube, the accelerating tube is used for accelerating the electron beam with the first set electron energy to the electron beam with the second set electron energy under the action of the microwave emitted by the microwave device.
According to an embodiment of the present disclosure, the energy range of the first set electron energy is 10keV to 100keV; and/or the second set electron energy has an energy in the range of 500keV to 9MeV.
According to one embodiment of the present disclosure, the material of the target comprises a high atomic number material having an atomic number between 47 and 92, and the thickness of the target along the normal direction of the target plane is 0.3-100 mm.
According to one embodiment of the present disclosure, the material of the target is selected from at least one of tungsten, tantalum, rhenium, gold, or silver.
According to one embodiment of the present disclosure, the material of the target comprises a medium atomic number material having an atomic number between 10 and 46, and the thickness of the target along a normal to the plane of the target is 1-200 mm.
According to one embodiment of the present disclosure, the material of the target is selected from at least one of copper, stainless steel or aluminum.
According to an embodiment of the present disclosure, the reflex accelerator further includes a target chamber and a vacuum sealing window, the vacuum sealing window is disposed on an emission path of the X-ray beam for maintaining a vacuum environment of the target chamber and guiding out the X-ray beam.
According to one embodiment of the disclosure, the vacuum sealing window is made of at least one material selected from beryllium, graphite or aluminum, and the thickness of the vacuum sealing window is 0.5-6 mm; or the preparation material of the vacuum sealing window is at least one of stainless steel or copper, and the thickness of the vacuum sealing window is 0.3-2 mm.
According to an embodiment of the present disclosure, the radiation source further comprises a shielding structure, the shielding structure surrounding the reflective accelerator; the shielding structure is provided with an exit port at a position corresponding to the vacuum sealing window, the exit port is configured to be used for leading out an X-ray beam to act on an object to be checked, and the beam surface of the X-ray beam is fan-shaped or conical.
According to one embodiment of the present disclosure, the target is a multi-layered target formed of a material selected from at least one of tungsten, tantalum, rhenium, gold, silver, stainless steel, or aluminum; alternatively, the target is an alloy target formed of a material selected from at least two of tungsten, tantalum, rhenium, gold, silver, stainless steel, and aluminum.
According to one embodiment of the present disclosure, the vacuum sealing window is a multi-layered sealing window formed of a material selected from at least two of beryllium, graphite, aluminum, iron, or copper.
According to an embodiment of another aspect of the present disclosure, there is provided a radiation inspection system characterized by including: an examination channel, a radiation source as described above, and a detector. The object to be inspected is suitable for being arranged in the inspection channel; a detector for detecting at least a portion of the X-ray beam emitted from the radiation source and interacting with an object to be inspected, wherein the object to be inspected is a vehicle that moves in the inspection tunnel in a direction of travel during radiation inspection; the radiation source is arranged on a top side of the examination channel and the detector is arranged on at least one of a bottom side, a first side or a second side of the examination channel, the first side and the second side being opposite sides of the examination channel.
According to an embodiment of the present disclosure, the radiation inspection system further comprises a collimator disposed between the radiation source and the object to be inspected for constraining the X-ray beam to a fan beam.
Drawings
Fig. 1 schematically illustrates a block diagram of a radiation source according to an embodiment of the present disclosure;
FIG. 2 schematically illustrates a functional schematic of a target according to an embodiment of the present disclosure;
FIG. 3a schematically illustrates a graph of a comparison of the energy spectra of a 1.5MeV transmission accelerator and a reflection accelerator at a first set angle of 90 according to an embodiment of the disclosure;
FIG. 3b is a schematic diagram showing a comparison of the energy spectra of a 1.5MeV reflex accelerator at different first set angles for the reflex accelerator according to an embodiment of the present disclosure;
FIG. 4 schematically illustrates a perspective view of a radiation inspection system according to an embodiment of the present disclosure;
FIG. 5 schematically illustrates a top view of a radiation inspection system according to an embodiment of the present disclosure;
FIG. 6 schematically illustrates a front view of a radiation inspection system according to an embodiment of the present disclosure;
FIG. 7 schematically illustrates a block diagram of components of a radiation inspection system according to an embodiment of the present disclosure;
FIG. 8 schematically illustrates a radiation inspection system air wire resolution index and penetration index map in accordance with an embodiment of the present disclosure;
FIG. 9 schematically illustrates a mass thickness interval of 2 to 30g/cm according to an embodiment of the disclosure 2 Identification maps of four substance classes (organic, inorganic, mixture, heavy metals);
FIG. 10 schematically illustrates a flow chart of a radiation inspection method according to an embodiment of the present disclosure; and
FIG. 11 schematically shows a block diagram of an electronic device according to an embodiment of the disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without any inventive step, are intended to be within the scope of the present disclosure.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are based on the traveling direction of the vehicle, only for the convenience of describing and simplifying the present disclosure, and in the case of not being explained to the contrary, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the scope of the present disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
In the description of the present disclosure, it should be understood that the terms "first," "second," and the like are used for limiting the components, and are used only for the convenience of distinguishing the corresponding components, and if not otherwise stated, the above terms do not have special meanings, and therefore, should not be construed as limiting the scope of the present disclosure.
According to a general inventive concept of the present disclosure, there is provided a radiation source including a reflex accelerator including a target, the reflex accelerator configured to: responding to electron beams bombarding a target, emitting X-ray beams, wherein in the reflection type accelerator, the electron beams are incident on the target along a first direction, the X-ray beams are emitted from the target along a second direction, the first direction and the second direction are both positioned at the same side of the target, a first set included angle exists between the first direction and the second direction, and the first set included angle is between 20 degrees and 160 degrees.
According to another general inventive concept of the present disclosure, there is provided a radiation inspection system, including: an examination channel, a radiation source, and a detector. The object to be inspected is suitable for being arranged in the inspection channel; a detector for detecting at least a portion of the X-ray beam emitted from the radiation source and interacting with an object to be inspected, wherein the object to be inspected is a vehicle that moves in the inspection tunnel in a direction of travel during radiation inspection; the radiation source is arranged on a top side of the examination channel and the detector is arranged on at least one of a bottom side, a first side or a second side of the examination channel, the first side and the second side being opposite sides of the examination channel.
FIG. 1 schematically illustrates a block diagram of a radiation source according to an embodiment of the present disclosure; FIG. 2 schematically illustrates a functional schematic of a target according to an embodiment of the present disclosure; fig. 3a schematically shows a comparison of the energy spectra of a 1.5MeV transmission accelerator and a reflection accelerator at a first set angle of 90 ° according to an embodiment of the disclosure. Figure 3b schematically shows a graph comparing the energy spectra of a 1.5MeV reflex accelerator for different first set angles of the reflex accelerator according to an embodiment of the disclosure.
The accelerator can be divided into a transmission type accelerator and a reflection type accelerator, in a radiation source adopting the transmission type accelerator, an electron beam generated by the accelerator impacts a high atomic number target to generate bremsstrahlung X-ray, and an X-ray beam is led out in a direction parallel to the electron beam, and an inspection system adopting the transmission type accelerator as the radiation source generally has a better penetration index (a steel plate with the thickness of more than or equal to 150 mm), as shown in fig. 3a, mainly because the average energy of high-energy X-ray (the energy of the X-ray is more than 500 kilo electron volts, the same below) in an X-ray energy spectrum is higher, but the silk resolution index of the inspection system is generally weaker and two or more substance types (mainly comprising four substance types of organic matter, mixture, inorganic matter and heavy metal) cannot be effectively identified, mainly because the proportion of low-energy X-ray (the energy of the X-ray is less than 200 kilo electron volts, the same below) in the X-ray energy spectrum is lower, for example, the proportion of the number of the low-energy X-ray is only 20.7%, so that the proportion of the silk resolution and the quality of the substance type identification imaging index is obviously improved in order to effectively improve the proportion of the X-ray. For example, patent nos. CN107613627 and CN109195301 both disclose an accelerator with adjustable energy, which can adjust the energy of an electron beam within the range of 0.5-2.0 mev, and when the energy of an electron beam is reduced from 1.5mev to 1.0 mev, the ratio of the number of low-energy X-rays is only increased from 20.7% to 24.8%, which cannot quickly increase the wire resolution and the quality of the substance type identification imaging index. The energy spectrum of the reflection accelerator is significantly different from that of the transmission accelerator, as shown in fig. 3a, the energy spectrum of the reflection accelerator has a higher proportion of low-energy X-rays, the proportion of the low-energy X-rays of the reflection accelerator is about 3 times that of the transmission accelerator, and the average energy of the high-energy X-rays is reduced by about 9.6% and about 72 kev compared with the transmission accelerator, as shown in table 1:
| type of accelerator | Low energy X-ray number ratio | Mean energy of high-energy X-rays |
| Reflection type | 62.1％ | 716keV |
| Transmissive type | 20.7％ | 788keV |
Therefore, the radiation source based on the reflection type accelerator is provided, compared with the radiation source of the transmission type accelerator, the proportion of low-energy X rays in an X-ray energy spectrum can be obviously improved, meanwhile, the average energy of the high-energy X rays cannot be obviously reduced, in addition, the manufacturing cost is not increased, and the realization is easy.
In this context, the expression "accelerator" is a device that accelerates charged particles such as electrons to high energy through an acceleration tube using high frequency electromagnetic waves. It will be understood by those skilled in the art that an "accelerator" is different from an X-ray machine and an X-ray tube (also referred to as an X-ray tube, a tube ball, etc.), that the acceleration principle of an accelerator is different from that of an X-ray tube, and that the electron beam energy of an accelerator is generally higher than that of an X-ray tube, and accordingly, the application fields of the two are different.
In an embodiment of the present disclosure, there is provided a radiation source, as shown in fig. 1 and 2, the radiation source 120 includes a reflective accelerator 121, the reflective accelerator 121 includes a target T, and the reflective accelerator 121 is configured to: emitting an X-ray beam r in response to an electron beam e striking the target T, the electron beam e being in a first direction d in the reflex accelerator 121 1 Incident on the target T, the X-ray beam r being directed in a second direction d 2 From said target T, said first direction d 1 And said second direction d 2 Are all positioned at the same side of the target T, the first direction d 1 And said second direction d 2 Has a first set included angle theta 1 The first set angle theta 1 Between 20 and 160 degrees.
In the embodiment of the present disclosure, as shown in fig. 1 and fig. 2, the reflex accelerator 121 further includes an electron gun 1211 and an accelerating device 1212. The electron gun 1211 is for emitting an electron beam e having a first set electron energy 1 (ii) a The accelerating device 1212 is configured to accelerate the electron beam with the first set electron energy to obtain an electron beam e. Wherein, the electron beam emitted by the electron gun is accelerated by the accelerating device and then follows a first direction d 1 Incident on the target T in the first direction d 1 At a second set angle theta to the normal O (shown by dashed line) to the target plane 2 The second set angle theta 2 Between 10 and 80 degrees. Emitting an X-ray beam r in response to an electron beam e bombarding the target T, the X-ray beam r being in a second direction d 2 From said target T, said first direction d 1 And said second direction d 2 Has a first set included angle theta 1 The first set angle theta 1 Between 20 DEG and 160 DEG, e.g. 60 DEG, 90 DEG and 120 DEG, and as shown in connection with FIGS. 3a and 3b, at a first set angle theta 1 When the X-ray energy spectrum of the reflection type accelerator is respectively 20 degrees, 90 degrees and 160 degrees, the proportion of the low-energy X-rays in the X-ray energy spectrum of the reflection type accelerator is in a rule from high to low, and is far higher than the proportion of the low-energy X-rays in the X-ray energy spectrum of the transmission type accelerator, and the distribution difference of the high-energy X-rays in the X-ray energy spectrum of the reflection type accelerator is smaller.
According to an embodiment of the present disclosure, as shown in fig. 2, the second direction d 2 A third set angle theta exists between the direction of the normal O of the target plane 3 And the third set angle theta 3 At an angle theta with respect to the second set angle 2 The sum of the first set included angle theta 1 E.g. when said first set angle theta 1 Is 90 degrees, and the second set included angle theta 2 Is 45 degrees, saidThree set included angles theta 3 Is 45 degrees; or when the first set included angle theta 1 Is 90 degrees, and the second set included angle theta 2 Is 75 degrees, and the third set included angle theta 3 Is 15 deg..
According to an embodiment of the present disclosure, as shown in fig. 3a and 3b, the X-ray beam r emitted by the reflex accelerator 121 has a continuous energy spectrum, and the X-ray beam r includes a first energy E 1 And a first X-ray beam having a second energy E 2 Of the first energy E 1 In the range of 0 to 200keV, said second energy E 2 Is greater than 200keV. More preferably, the average energy of the second X-ray beam is higher than 700keV. In the X-ray beam emitted by the reflex accelerator, the proportion of the first X-ray beam is greater than that of the second X-ray beam, for example, the proportion of the first X-ray beam is greater than 60%, for example, the target material is tungsten, the electron energy of the emitted X-ray beam is 1.5mev, and the X-ray energy spectrum is as shown in fig. 3 a.
According to the embodiment of the present disclosure, as shown in fig. 1, the acceleration device 1212 includes an acceleration tube 1212a and a microwave device 1212b connected to the acceleration tube 1212 a; the accelerating tube 1212a is used for accelerating the electron beam e1 with the first set electron energy to the electron beam e with the second set electron energy under the action of the microwaves emitted from the microwave device 1212 b.
According to an embodiment of the present disclosure, the first set electron energy has an energy range of 35keV to 45keV; the second set electron energy has an energy in the range of 500keV to 9MeV.
According to the embodiment of the present disclosure, as shown in fig. 1, the reflex accelerator 121 further includes a target cavity 1212c and a vacuum sealing window 1212d, where the vacuum sealing window 1212d is disposed on an emission path of the X-ray beam, and is configured to maintain a vacuum environment of the target cavity 1212c and to extract the X-ray beam r. The preparation material of the vacuum sealing window 1212d is selected from at least one of beryllium, graphite or aluminum, and the thickness of the vacuum sealing window 1212d is 0.5-6 mm; or, the vacuum sealing window 1212d is made of at least one of stainless steel or copper, and has a thickness of 0.3-2 mm. Alternatively, the vacuum sealing window is a multi-layer sealing window formed by at least two materials selected from beryllium, graphite, aluminum, iron or copper.
According to an embodiment of the present disclosure, as shown in fig. 1, the radiation source 120 further includes: a shielding structure 122 surrounding the reflective accelerator 121; the shielding structure 122 has an exit port 122a opened at a position corresponding to the vacuum sealing window 1212d, and the exit port is configured to enable the X-ray beam to act on an object to be inspected, wherein a beam flow surface of the X-ray beam r is fan-shaped or conical.
According to an embodiment of the present disclosure, the radiation inspection system further comprises a collimator disposed between the radiation source and the object to be inspected, for example, at the exit opening 122a, for constraining the X-ray beam to a fan-shaped beam.
Note that, in the electron gun of the accelerator 121, electrons are generated by thermal emission of the heated cathode; the electrostatic field generated by the cathode cup focuses the electrons to a small portion of the anode. Unlike the anode in the kilovolt-ampere machine, the anode of the accelerator 121 has a hole, where the electron is focused, so that the electron does not hit the anode, but enters the accelerating structure through the hole. For example, electron guns can be of two basic types: diode electron guns and triode electron guns. In a diode electron gun, the voltage applied to the cathode is pulsed, thus generating an electron beam, rather than a continuous stream of electrons. In a triode electron gun, a discrete electron beam is obtained by a grid. The cathode of the triode has a constant potential, and the voltage of the grid is pulsed. When the voltage applied to the gate is negative, the electrons will stop reaching the anode. When the gate voltage is removed, the electrons will accelerate towards the anode. Thus, the gate can control the frequency of the electron pulse entering the accelerating structure. The pulsing of the cathode or gate is controlled by a modulator connected to a radio frequency power generator.
For example, the acceleration tube may be a traveling wave acceleration tube or a standing wave acceleration tube. For example, the microwave device may include a microwave power source and a microwave transmission system. The microwave power source provides radio frequency power required by the accelerating tube to establish an accelerating field, and a magnetron and a klystron are used as the microwave power source.
According to an embodiment of the present disclosure, the material of the target T comprises a high atomic number material, and the thickness H of the target T in a normal direction of a target plane is 0.3 to 100 mm. The high atomic number material may be a material having an atomic number in the range of 47 to 92, for example at least one selected from tungsten, tantalum, rhenium, gold or silver. According to embodiments of the present disclosure, the material of the target may also comprise a medium atomic number material, and the thickness of the target in the direction normal to the plane of the target is 1-200 mm. The medium atomic number material may be a material having an atomic number between 10 and 46, for example, the material of the target is selected from at least one of copper, stainless steel or aluminum. Or the target is a multilayer target formed by at least one material selected from tungsten, tantalum, rhenium, gold, silver, stainless steel or aluminum; alternatively, the target is an alloy target formed of a material selected from at least two of tungsten, tantalum, rhenium, gold, silver, stainless steel, and aluminum.
Based on the radiation source, the present disclosure also provides a radiation inspection system, and the working principle of the safety inspection system such as the radiation source and the radiation inspection system can be summarized as follows: after a specific ray is emitted to act on an object to be checked, the ray acting on the object to be checked is detected and processed, and an interested part in the object to be checked is further identified. The radiation inspection system according to the embodiment of the present disclosure is suitable for quickly, efficiently and high-quality identifying the articles loaded on vehicles such as vans, container trucks, tank trucks, dump trucks, pick-up trucks, off-road vehicles and cars, so as to achieve the purpose of security inspection, or not only performing security inspection on the articles loaded on the vehicles, but also performing radiation inspection on articles in other vehicles or containers, such as luggage, logistics packages, cans or barrels. Through the security inspection, it is possible to confirm whether there are any prohibited or high-risk articles such as firearms, ammunition, explosives, drugs, control instruments, flammable and explosive articles, poisons, corrosive articles, radioactive articles, infectious materials, precious metals, and the like.
The related public safety industry standard GAT 1731-2020 technical requirements for X-ray safety inspection systems for passenger vehicles (industry standard for short) is formally published in 2020, and performance indexes in the industry standard mainly include wire resolution, penetration and basic substance identification capability, wherein the wire resolution is the capability of the X-ray safety inspection system in distinguishing a single solid copper wire and is generally represented by the nominal diameter (mm) of the wire. Penetration force refers to the ability of an X-ray security inspection system to penetrate the object being inspected, and is generally expressed in terms of the thickness (mm) of a steel plate. Identification of elemental species as the ability of an X-ray security inspection system to distinguish between organic species, mixtures, inorganic species and heavy metals is generally done by mass thickness (g/cm) 2 ) The highest level requirements for the above industry standard primary performance indicators are shown in table 2 below:
TABLE 2 highest-level table of main performance indexes of industry standards
In the embodiment of the present disclosure, the radiation inspection system may include a radiation source, a radiation detection system, an image processing system, a control system, and other components, the scanned vehicle is irradiated by the X-rays generated by the radiation source, and the scanned image of the scanned vehicle is obtained through the radiation detection system and the image processing imaging system.
Specifically, after the X-ray passes through the object to be inspected, due to the fact that the interaction characteristics of the X-ray and the object to be inspected are different, the characteristics of the X-ray passing through the object to be inspected are also different, the X-ray passing through the object to be inspected is separated into a plurality of characteristic signals after passing through the radiation detection system, the characteristic signals are optimized, screened, corrected, matched and analyzed through the image processing system, unique processing is adopted in the aspects of characteristic signal processing modes, matching modes and analysis algorithms, accurate and effective substance identification and accurate and detailed image reconstruction can be conducted on a scanned object, and finally the radiation inspection system of the scanned image with wider range of substance identification, higher resolution and more fineness is formed. In the process of implementing the invention, the inventor finds that, in order to meet the imaging index requirements of the highest level of the industrial standard on the inspection system, the proportion of low-energy X-rays (the energy of the X-rays is less than 200keV, the same applies below) in an X-ray energy spectrum generated by a radiation source needs to be remarkably increased, meanwhile, a radiation detection system can effectively detect different energy sections in the X-ray energy spectrum, the optimal characteristics of the X-rays in different energy sections are fully exerted, finally, an image processing imaging system calculates a transmission gray level image, and the identification of four substance classes on a scanned object is completed.
FIG. 4 schematically illustrates a perspective view of a radiation inspection system according to an embodiment of the present disclosure; FIG. 5 schematically illustrates a top view of a radiation inspection system according to an embodiment of the present disclosure; FIG. 6 schematically illustrates a front view of a radiation inspection system according to an embodiment of the present disclosure; FIG. 7 schematically illustrates a block diagram of components of a radiation inspection system according to an embodiment of the disclosure.
Referring to fig. 4, 5, and 7, the radiation inspection of the passenger car 10 will be described as an example, and the passenger car 10 is used as an object to be inspected. It should be noted that the object to be inspected in the embodiments of the present disclosure is not limited to a passenger car, but may also include any other suitable type of object, including but not limited to a van, a container truck, a tank truck, a dump truck, a pick-up truck, and the like.
According to an exemplary embodiment of the present disclosure, shown in conjunction with fig. 4-7, there is provided a radiation inspection system 100 comprising: an examination channel 110, a radiation source 120, a detector 130. A passenger car 10 as an object to be inspected is disposed in the inspection passage 110; a radiation source 120 is arranged at least on one side of the examination channel 110, the radiation source 120 emitting radiation, at least a part of which is used for examining the object to be examined; a detector 130 is arranged at least on one side of the examination channel 110, which detector 130 is adapted for detecting at least a part of the X-ray beam emanating from the radiation source 120 and having interacted with the object to be examined. For example, the detector 130 may be a basic structure based on signal separation technology and employing a double-layer detector, and the characteristic signal of the X-ray beam r input to the detector 130 is separated to detect different energy segments in the X-ray energy spectrum respectively.
According to an embodiment of the present disclosure, as shown in fig. 4, 5 and 6, the inspection passage 110 may include a gantry 111 and a through tunnel 112 passing through the gantry 111, the gantry 111 and/or the through tunnel 112 being movable; the radiation source 120 may, for example, be arranged on the upper and/or lower side and/or left and/or lower side of the examination channel 110; the detector 130, corresponding to the radiation source 120, may also be arranged, for example, on the upper and/or lower side and/or on the left and/or lower side of the examination channel 100. In the embodiment of the present disclosure, the radiation source 120 is disposed on the beam of the gantry 111 on the upper side of the inspection passage 100, and the detectors are disposed on the left side (left column of the gantry 111), the right side (right column of the gantry 111), and the lower side (on the through-passage 112) of the inspection passage 100, as an example, in conjunction with fig. 4, 5, and 6. The type of the radiation emitted by the radiation source 120 may be, for example, alpha rays, beta rays, X rays, or gamma rays, and in the embodiment of the present disclosure, the radiation source 120 emits X rays as an example.
FIG. 8 schematically illustrates a radiation inspection system air wire resolution index and penetration index map in accordance with an embodiment of the present disclosure; FIG. 9 schematically illustrates a mass thickness interval of 2-30 g/cm according to an embodiment of the disclosure 2 Identification diagram of four substance classes (organic matter, inorganic matter, mixture and heavy metal).
The digital signal of the detector 130 output by the radiation inspection system is calculated to obtain a gray image after necessary correction, noise reduction and other processing, as shown in fig. 8, wherein the air wire resolution index reaches 0.4mm, and the penetration index reaches 160mm. Finally, an image of the identification result of the substance type of the interested part in the object to be inspected is given, and the identification result of the substance is marked on the image in different colors. Referring to the substance identification coloring standard shown in fig. 9, the equivalent average atomic number of the region is calculated according to a linear or common interpolation algorithm by comparing the first and second transmittance average values with the detector transmittance logarithmic ratio R value and the substance identification curves of four typical substance materials, the average atomic number information is divided according to the organic matter, mixture, inorganic matter and heavy metal 4 classes of materials and determines the color tone, for example, the organic matter is orange, the mixture is green, the inorganic matter is blue, and the heavy metal is purple, the color saturation and brightness are determined according to the transmittance, and finally, the four substance class identification result image of the detected object is output. As shown in table 3 below, the wire resolution, the penetration, and the material category identification ability in the main performance indexes of the radiation inspection system of the present disclosure all reach the highest level of the industry standard, so as to provide a scanning image with higher resolution and finer resolution, and provide more accurate material category information of the interested part in the object to be inspected.
TABLE 3 highest-level comparison table of main performance indexes of radiation inspection system and industry standard of the present disclosure
According to the embodiment of the present disclosure, as shown in fig. 4 to 6, the object to be inspected is a passenger vehicle 10, which moves in the inspection tunnel 110 in the traveling direction during the radiation inspection; the radiation source 120 is disposed on a top side of the inspection channel 110, and the detector 130 is disposed on at least one of a bottom side, a first side, or a second side of the inspection channel 110, the first side and the second side being opposite sides of the inspection channel. Furthermore, a shielding wall 160 is disposed outside the inspection passage, and the shielding wall 160 is used for reducing the overflow of the X-rays.
According to an embodiment of the present disclosure, as shown in fig. 4 to 6, and fig. 7, the radiation inspection system 100 further includes a scan control device 150 adapted to control the inspection channel 110, the radiation source 120, the detector 130, and the image processing device 140 to perform a scan inspection; taking the passenger car 10 as an object to be inspected, a parking inspection or driving inspection mode can be adopted, and the parking inspection mode can control the movement of the gantry 111 to scan the whole passenger car 10, or control the through road 112 to drive the passenger car 10 to move under the gantry 111, so that the radiation inspection system scans the whole passenger car 10; and in the driving inspection mode, the object to be inspected is limited to drive through the inspection channel at a proper speed at a constant speed, so that the radiation inspection system scans the whole passenger car 10 or a part of interest of the passenger car 10, and in the scanning process, the image processing device 140 is controlled to synchronously generate a material class identification result image of the part of interest in the object to be inspected, and the radiation inspection is completed.
Fig. 10 schematically illustrates a flow chart of a radiation inspection method according to an embodiment of the present disclosure.
According to an embodiment of another aspect of the present disclosure, as shown in fig. 10, there is provided a radiation inspection method for inspecting an object to be inspected by using the radiation inspection system according to any one of the above embodiments, including the steps of: s1, detecting the position of an object to be detected in the detection channel; step S2, responding to the object to be checked reaching a preset position in the checking channel, controlling the radiation source to emit an X-ray beam so as to irradiate the object to be checked with the X-ray beam; and a step S3 of controlling the detector to detect at least a portion of the X-ray beam emitted from the radiation source and interacting with the object to be examined.
According to the embodiment of the disclosure, the radiation inspection system based on the radiation source of the reflex accelerator has high air wire resolution (not more than 0.404 mm), high penetration (not less than 150 mm) and four substance category capabilities (organic matters, inorganic matters, mixtures and heavy metals), and main performance indexes can reach the highest level of industrial standards at the same time, so that the purpose of enhancing the safety inspection capability of the inspection system is achieved. The system can be used for carrying out safety inspection on vehicles which are about to enter airports, docks, ports, important logistics hubs, important meeting venues, customs, frontier inspections and the like, and can be used for carrying out quick, accurate and efficient inspection on articles loaded by the vehicles under the conditions that the vehicles do not stop running and drivers get off the vehicles.
For example, the image processing apparatus 140 and the scan control apparatus 150 may be 2 apparatuses independent, but embodiments of the present disclosure are not limited thereto, and in some exemplary embodiments, the image processing apparatus 140 and the scan control apparatus 150 may be integrated in 1 apparatus.
Fig. 11 schematically shows a block diagram of an electronic device according to an embodiment of the present disclosure, for example, the electronic device may include at least one of the image processing apparatus 140 and the scan control apparatus 150, i.e., the electronic device may be an apparatus adapted to implement a function of an indication one of the image processing apparatus 140 and the scan control apparatus 150.
As shown in fig. 11, an electronic apparatus 900 according to an embodiment of the present disclosure includes a processor 901 which can perform various appropriate actions and processes in accordance with a program stored in a Read Only Memory (ROM) 902 or a program loaded from a storage portion 908 into a Random Access Memory (RAM) 903. Processor 901 may comprise, for example, a general purpose microprocessor (e.g., a CPU), an instruction set processor and/or associated chipset, and/or a special purpose microprocessor (e.g., an Application Specific Integrated Circuit (ASIC)), among others. The processor 901 may also include on-board memory for caching purposes. The processor 901 may comprise a single processing unit or a plurality of processing units for performing the different actions of the method flows according to embodiments of the present disclosure.
In the RAM903, various programs and data necessary for the operation of the electronic apparatus 900 are stored. The processor 901, the ROM 902, and the RAM903 are connected to each other through a bus 904. The processor 901 performs various operations of the method flows according to the embodiments of the present disclosure by executing programs in the ROM 902 and/or the RAM 903. Note that the programs may also be stored in one or more memories other than the ROM 902 and the RAM 903. The processor 901 may also perform various operations of the method flows according to embodiments of the present disclosure by executing programs stored in the one or more memories.
The present disclosure also provides a computer-readable storage medium, which may be contained in the apparatus/device/system described in the above embodiments; or may exist alone without being assembled into the device/apparatus/system. The computer-readable storage medium carries one or more programs which, when executed, implement the method according to an embodiment of the disclosure.
According to embodiments of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, which may include, for example but is not limited to: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. For example, according to embodiments of the present disclosure, a computer-readable storage medium may include the ROM 902 and/or the RAM903 described above and/or one or more memories other than the ROM 902 and the RAM 903.
Embodiments of the present disclosure also include a computer program product comprising a computer program containing program code for performing the method illustrated by the flow chart. When the computer program product runs in a computer system, the program code is used for causing the computer system to realize the item recommendation method provided by the embodiment of the disclosure.
The computer program performs the above-described functions defined in the system/apparatus of the embodiments of the present disclosure when executed by the processor 901. The systems, apparatuses, modules, units, etc. described above may be implemented by computer program modules according to embodiments of the present disclosure.
In one embodiment, the computer program may be hosted on a tangible storage medium such as an optical storage device, a magnetic storage device, or the like. In another embodiment, the computer program may also be transmitted, distributed in the form of a signal on a network medium, and downloaded and installed through the communication section 909 and/or installed from the removable medium 911. The computer program containing program code may be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 909, and/or installed from the removable medium 911. The computer program, when executed by the processor 901, performs the above-described functions defined in the system of the embodiment of the present disclosure. The systems, devices, apparatuses, modules, units, etc. described above may be implemented by computer program modules according to embodiments of the present disclosure.
In accordance with embodiments of the present disclosure, program code for executing computer programs provided by embodiments of the present disclosure may be written in any combination of one or more programming languages, and in particular, these computer programs may be implemented using high level procedural and/or object oriented programming languages, and/or assembly/machine languages. The programming language includes, but is not limited to, programming languages such as Java, C + +, python, the "C" language, or the like. The program code may execute entirely on the user computing device, partly on the user device, partly on a remote computing device, or entirely on the remote computing device or server. In situations involving remote computing devices, the remote computing devices may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to external computing devices (e.g., through the internet using an internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It will be appreciated by those skilled in the art that the embodiments described above are exemplary and can be modified by those skilled in the art, and that the structures described in the various embodiments can be freely combined without conflict in structure or principle.
While the present disclosure has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of the preferred embodiments of the disclosure, and should not be construed as limiting the disclosure. Although a few embodiments of the disclosed inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
Claims (17)
1. A radiation source, comprising a reflex accelerator comprising a target, the reflex accelerator configured to: emitting an X-ray beam in response to an electron beam striking the target,
in the reflex accelerator, the electron beam is incident on the target along a first direction, the X-ray beam is emitted from the target along a second direction, the first direction and the second direction are both positioned on the same side of the target, a first set included angle exists between the first direction and the second direction, and the first set included angle is between 20 and 160 degrees.
2. The radiation source of claim 1, wherein the reflex accelerator further comprises:
an electron gun for emitting an electron beam having a first set electron energy; and
an accelerating means for accelerating the electron beam having a first set electron energy,
the electron beam emitted by the electron gun is accelerated by the accelerating device and then enters the target along a first direction, a second set included angle exists between the first direction and the normal direction of the target plane, and the second set included angle is 10-80 degrees.
3. The radiation source of claim 2, wherein a third set angle exists between the second direction and a normal direction of the target plane, and a sum of the third set angle and the second set angle is the first set angle.
4. The radiation source of any one of claims 1-3, wherein the X-ray beam emitted by the reflective accelerator has a continuous energy spectrum, the X-ray beam comprising a first X-ray beam having a first energy in the range of 0-200 keV and a second X-ray beam having a second energy in the range of greater than 200keV,
in the X-ray beams emitted by the reflection type accelerator, the proportion of the first X-ray beams is larger than that of the second X-ray beams.
5. A radiation source according to claim 2, wherein the accelerating means comprises an accelerating tube and a microwave means connected to the accelerating tube, the accelerating tube being adapted to accelerate the electron beam having a first set electron energy to the electron beam having a second set electron energy under the influence of microwaves emitted by the microwave means.
6. The radiation source according to claim 5, wherein the energy range of the first set electron energy is 10keV to 100keV; and/or the presence of a gas in the gas,
the second set electron energy has an energy in the range of 500keV to 9MeV.
7. The radiation source of any one of claims 1-3 and 5-6, wherein the material of the target comprises a high atomic number material having an atomic number between 47 and 92, the target having a thickness in the direction of the normal to the target plane of 0.3-100 mm.
8. The radiation source of claim 7, wherein the material of the target is selected from at least one of tungsten, tantalum, rhenium, gold, or silver.
9. The radiation source of any one of claims 1 to 3 and 5 to 6, wherein the material of the target comprises a medium atomic number material having an atomic number between 10 and 46, the target having a thickness in the range of 1 to 200 mm in a direction normal to the plane of the target.
10. The radiation source of claim 9, wherein the target material is selected from at least one of copper, stainless steel, or aluminum.
11. The radiation source of any one of claims 1-3 and 5-6, wherein the reflex accelerator further comprises a target chamber and a vacuum sealed window disposed in an exit path of the X-ray beam for maintaining a target chamber vacuum environment and extracting the X-ray beam.
12. The radiation source of claim 11, wherein the vacuum sealed window is made of a material selected from at least one of beryllium, graphite or aluminum, and has a thickness of 0.5 to 6 mm; alternatively, the first and second electrodes may be,
the preparation material of the vacuum sealing window is at least one of stainless steel or copper, and the thickness of the vacuum sealing window is 0.3-2 mm.
13. The radiation source of claim 11, further comprising:
a shielding structure surrounding the reflective accelerator;
the shielding structure is provided with an exit port at a position corresponding to the vacuum sealing window, the exit port is configured to be used for leading the X-ray beam to act on an object to be checked,
wherein, the beam flow surface of the X-ray beam is fan-shaped or conical.
14. The radiation source of any one of claims 1-3 and 5-6, wherein the target is a multi-layered target formed of a material selected from at least one of tungsten, tantalum, rhenium, gold, silver, stainless steel, or aluminum; alternatively, the first and second electrodes may be,
the target is an alloy target formed by at least two materials selected from tungsten, tantalum, rhenium, gold, silver, stainless steel or aluminum.
15. The radiation source of claim 11, wherein the vacuum sealed window is a multi-layered sealed window formed of a material selected from at least two of beryllium, graphite, aluminum, iron, or copper.
16. A radiation inspection system, comprising:
an inspection channel in which an object to be inspected is adapted to be arranged;
the radiation source of any one of claims 1-15; and
a detector for detecting at least a portion of an X-ray beam emitted from the radiation source and interacting with the object to be examined,
the object to be inspected is a vehicle, and the vehicle moves in the inspection channel along the traveling direction in the radiation inspection process; and
the radiation source is arranged at a top side of the examination channel and the detector is arranged at least one of a bottom side, a first side or a second side of the examination channel, the first side and the second side being opposite sides of the examination channel.
17. The radiation inspection system as set forth in claim 16, further comprising a collimator, wherein the collimator is disposed between the radiation source and the object to be inspected for constraining the X-ray beam to a fan beam.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211742642.XA CN115884485A (en) | 2022-12-30 | 2022-12-30 | Radiation source and radiation inspection system |
| CN202311714608.6A CN117816570A (en) | 2022-12-30 | 2023-12-13 | Ore sorting system employing electron accelerator |
| CN202311713756.6A CN117705838A (en) | 2022-12-30 | 2023-12-13 | Cargo vehicle inspection system employing electronic linac |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211742642.XA CN115884485A (en) | 2022-12-30 | 2022-12-30 | Radiation source and radiation inspection system |
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| Publication Number | Publication Date |
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| CN115884485A true CN115884485A (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211742642.XA Withdrawn CN115884485A (en) | 2022-12-30 | 2022-12-30 | Radiation source and radiation inspection system |
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| CN (1) | CN115884485A (en) |
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- 2022-12-30 CN CN202211742642.XA patent/CN115884485A/en not_active Withdrawn
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