KR20220076075A - Gamma ray measuring device and nondestructive inspection system - Google Patents

Abstract

The present invention relates to an apparatus for measuring gamma rays through a radiation analysis method using neutrons. The gamma-ray measuring device includes: a frame; a gamma ray detector installed on the upper portion of the frame and configured to detect gamma rays generated from the subject irradiated with the neutrons; a detector support for movably supporting the gamma-ray detector on an upper horizontal surface of the frame; and a subject support part supporting the subject to be lifted and lowered so that the subject is located on the same plane as the gamma ray detector under the frame. According to this configuration, it is possible to accurately detect dangerous substances by increasing the efficiency compared to the existing non-destructive testing equipment for explosives and narcotics, increasing the analysis rate and reducing the error rate.

Description

GAMMA RAY MEASURING DEVICE AND NONDESTRUCTIVE INSPECTION SYSTEM

The present invention relates to a gamma-ray measuring device capable of detecting and detecting the location and detection of dangerous substances such as explosives and narcotics using a neutron radiation analysis method, and a non-destructive inspection system having the same.

Non-destructive testing refers to externally inspecting the internal properties of a product without destroying it.

A non-destructive testing system refers to a set of equipment that implements non-destructive testing.

Non-destructive testing and non-destructive testing systems are being used in various fields such as medical care, security, and quarantine.

Guns, knives, swords, etc., which can be checked in non-destructive testing, can be detected using visual identification or automatic identification technology.

However, dangerous substances such as explosives or unlicensed items such as narcotics are made of substances such as powders and liquids that are difficult to specify in shape, and explosives or narcotics are loaded with cargo made of similar substances (eg, flour). Explosives in the bag), explosives, or drugs are difficult to distinguish.

A first object of the present invention is to provide a gamma-ray measuring device having a structure capable of detecting explosives and drugs and detecting two- and three-dimensional positions using a neutron radiation analysis method and a non-destructive inspection system having the same.

A second object of the present invention is to provide a gamma-ray measuring apparatus having a structure that is easy to move and a non-destructive inspection system having the same.

The present invention uses neutrons to measure gamma rays generated by irradiating only an object to be inspected to easily detect dangerous substances and to provide a gamma ray measuring device having a structure that can accurately detect dangerous substances and a non-destructive inspection system having the same There is a purpose.

A fourth object of the present invention is to provide a gamma-ray measuring device and a non-destructive testing system having a structure capable of accurately detecting a region of interest of a sample by performing a linear motion around a sample to be inspected.

A fifth object of the present invention is to provide a gamma ray measuring device having a structure that can easily replace a sample and increase efficiency because a support for supporting a sample can be raised and lowered, and a non-destructive testing system having the same.

A sixth object of the present invention is to provide a gamma ray measuring apparatus having a structure capable of protecting a detector from background gamma rays and a non-destructive inspection system having the same.

In order to achieve the above object, a gamma-ray measuring apparatus according to the present invention, a frame; a gamma ray detector installed on the upper portion of the frame and configured to detect gamma rays generated from an object irradiated with neutrons; a detector support for movably supporting the gamma-ray detector on an upper horizontal surface of the frame; and a subject support part supporting the subject to be lifted and lowered so that the subject is located on the same plane as the gamma ray detector under the frame.

According to an example related to the present invention, a plurality of the gamma-ray detectors may be provided and may be disposed to be spaced apart from each other in the front-rear direction and the left-right direction with the subject interposed therebetween.

According to an example related to the present invention, the detector support unit may include: a plurality of LM guides supporting the gamma-ray detector to be linearly movable in a horizontal direction; and a support plate mounted on the plurality of LM guides to support the gamma-ray detector to be movable in a straight line toward the subject.

According to an example related to the present invention, the LM guide may include a plurality of guide rails; a guide block sliding along the plurality of guide rails; It is provided on the inside of the guide block and may include a plurality of guide balls in rolling contact with the guide rail.

According to an example related to the present invention, the gamma-ray measuring apparatus includes: a detector driver; and a ball screw that receives power from the detector driving unit to convert rotational motion into linear motion, and drives the gamma-ray detector to enable linear motion.

According to an example related to the present invention, the ball screw may include a screw shaft rotating by receiving power from the detector driving unit; a nut portion having a plurality of balls in rolling contact with the spiral groove formed on the screw shaft and sliding in the axial direction of the screw shaft; and a connector connecting the nut part and the detector support part.

According to an example related to the present invention, the detector driving unit may be implemented as a driving motor or a front wheel unit.

According to an example related to the present invention, the subject support unit may include: a subject support plate moving in a vertical direction between a lower portion of the frame and an object input hole formed at an upper portion of the frame; and a plurality of elevating guide bars extending downward from the subject support plate and supporting the subject support plate to be elevated.

According to an example related to the present invention, the mounting plate is arranged to be spaced in the downward direction from the support part to be inspected, the mounting plate is installed in the lower portion of the frame; and a plurality of sleeves formed to protrude from the mounting plate and surrounding each of the plurality of lifting guide bars.

According to an example related to the present invention, the gamma-ray measuring apparatus includes: a subject driver; It may include a power transmission unit that receives power from the subject driving unit to convert the rotational motion into vertical and linear motion, and transmits power to the subject support unit so that the subject can ascend and descend.

According to an example related to the present invention, the power transmission unit may include: a pinion connected to the target driving unit and rotatably installed at a lower portion of the frame; and a rack gear extending downwardly from the support part to be inspected and engaged with the pinion.

According to an example related to the present invention, the target driving unit may be implemented as a driving motor or a front wheel unit.

According to an example related to the present invention, the gamma ray measuring apparatus may further include a shielding unit accommodating the gamma ray detector inside and shielding background gamma rays incident to the gamma ray detector.

According to an example related to the present invention, the shielding unit may include: a plurality of sidewalls forming front, rear, left, and right side surfaces; an upper plate formed to cover upper portions of the plurality of sidewalls; It may include a lower plate having a subject input hole on the inside.

According to an example related to the present invention, the shielding unit may include: an outer shielding wall; an inner shielding wall disposed inside the outer shielding wall; and a shielding block disposed between the outer shielding wall and the inner shielding wall, wherein the shielding block may have a thickness greater than a thickness of the outer shielding wall and the inner shielding wall.

According to an example related to the present invention, the shielding unit may include a particle trap on one side so that the neutrons are incident on the subject.

According to an example related to the present invention, the shielding block may be formed of a lead material, and the shielding wall may be formed of an aluminum material.

According to an example related to the present invention, the upper plate and the lower plate may be formed of a lead material.

According to an example related to the present invention, the frame may be formed of aluminum or lead material.

According to an example related to the present invention, it may further include a plurality of casters installed at the lower end of the frame to movably support the frame.

Non-destructive inspection system according to the present invention, a radiation generating device for generating neutrons to irradiate an object to be inspected; and a gamma ray measuring device disposed adjacent to the radiation generating device and measuring gamma rays generated from the subject, wherein the gamma ray measuring device includes: a frame; a gamma ray detector installed on the upper portion of the frame and configured to detect gamma rays generated from the subject irradiated with the neutrons; a detector support for movably supporting the gamma-ray detector on an upper horizontal surface of the frame; and a subject support part supporting the subject to be lifted and lowered so that the subject is located on the same plane as the gamma ray detector under the frame.

According to an example related to the non-destructive inspection system of the present invention, the radiation generating device includes a housing having an irradiation slot for accommodating a radiation irradiator and passing the neutrons irradiated from the radiation irradiator toward the subject to be inspected, , The housing includes a shielding member forming a front surface, a rear surface, and left and right sides, an upper surface and a lower surface provided with the irradiation slot, and the shielding member may shield the neutrons.

The effects of the gamma-ray measuring apparatus and the non-destructive inspection system having the same according to the present invention will be described as follows.

First, it is possible to accurately detect dangerous substances by increasing the inspection efficiency, increasing the analysis rate, and reducing the measurement error rate of non-destructive testing compared to the existing non-destructive testing equipment for explosives and narcotics.

Second, it is possible to easily detect dangerous substances that are difficult to specify the shape of various cargoes, for example, explosives, narcotics, and radioactive substances.

Third, since the object support part supports the object to be lifted and lowered, it is possible to easily replace, load, or remove the object without removing the shielding part.

Fourth, since the subject support plate and the shielding part are made of a material that is difficult to emit radiation such as lead, it is possible to shield the background gamma rays to remove noise.

Fifth, a plurality of gamma-ray detectors are connected to each other and share information on the position and angle of gamma rays generated when neutrons pass through the subject, so that the location of dangerous objects can be accurately determined by analyzing the difference in the generation time of gamma rays. have.

Sixth, since the plurality of gamma-ray detectors are movably supported toward the subject, it is easy to access the area of interest for the dangerous object.

Seventh, since the frame supporting the gamma-ray detector and the subject is made of a material that does not irradiate well, such as aluminum and lead, only the subject is irradiated using neutrons, and the instantaneous gamma rays generated through irradiation are measured and dangerous. can be accurately detected.

Eighth, by forming the material of the frame with aluminum and lead instead of SUS or carbon steel, which has good radiation properties, it is possible to minimize the effect of radiation on objects other than the test object, and the radiation problem when using a mobile gamma ray measuring device It is also advantageous in terms of radiation safety.

1 is a conceptual diagram showing an embodiment of a non-destructive inspection system according to the present invention.
FIG. 2 is a perspective view illustrating the gamma-ray measuring apparatus of FIG. 1 .
FIG. 3 is a perspective view illustrating a state in which a gamma-ray detector is installed in a frame after a shielding part is removed in FIG. 2 .
4 is a front view taken along IV-IV in FIG. 1 ;
FIG. 5 is a plan view taken along VV in FIG. 4 .
Fig. 6 is a side view taken along VI-VI in Fig. 5;
7 is a cross-sectional view taken along lines VII-VII to explain the connection relationship between the detector support part and the detector driving part in FIG. 5 .
8 is an enlarged view of VIII in FIG. 7 and is a conceptual view showing a nut portion and a stopper of the ball screw.
FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 3 to explain a connection relationship between the object support part and the object driving part.
FIG. 10 is a side view taken along XX in FIG. 9 ;
11 is a conceptual diagram for explaining the structure of the shielding unit in FIG. 2 .
12 is a conceptual diagram showing a state in which the subject support part is lowered for loading the subject in FIG. 1 .
FIG. 13 is a conceptual diagram illustrating a state in which the support part of the test object loaded with the test object is raised for gamma-ray measurement in FIG. 12 .

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprises” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

The terms “front side”, “rear side”, “left”, “right”, “top” and “bottom” used in the following description will be understood with reference to the coordinate system shown in FIG. 1 .

For example, it may be understood that the front-back direction is the X-X' axis direction, the left-right direction is the Y-Y' axis direction, and the vertical direction means the Z-Z' axis direction.

1 is a conceptual diagram showing an embodiment of a non-destructive inspection system 100 according to the present invention.

FIG. 2 is a perspective view showing the gamma-ray measuring device 120 of FIG. 1 .

3 is a perspective view illustrating a state in which the gamma ray detector 123 is installed on the frame 121 after the shielding unit 160 is removed in FIG. 2 .

4 is a front view taken along IV-IV in FIG. 1 ;

FIG. 5 is a plan view taken along V-V in FIG. 4 .

Fig. 6 is a side view taken along VI-VI in Fig. 5;

7 is a cross-sectional view taken along lines VII-VII to explain the connection relationship between the detector support 124 and the detector driver 137 in FIG. 5 .

8 is an enlarged view of VIII in FIG. 7 , and is a conceptual view showing the nut portion 143 and the stopper 145 of the ball screw 140 .

9 is a cross-sectional view taken along line IX-IX in order to explain the connection relationship between the subject support part 147 and the subject driver 153 in FIG. 3 .

Fig. 10 is a side view taken along line X-X in Fig. 9;

11 is a conceptual diagram for explaining the structure of the shielding unit 160 in FIG. 2 .

12 is a conceptual diagram illustrating a state in which the subject support part 147 descends for loading the subject 122 in FIG. 1 .

13 is a conceptual diagram illustrating a state in which the object support 147 on which the object 122 is loaded is raised for gamma-ray measurement in FIG. 12 .

The non-destructive inspection system 100 according to the present invention is a device for externally inspecting the properties of the inside of the product without destroying the product. The non-destructive inspection system 100 may be utilized in various fields such as medical care, security, and quarantine. In particular, it is possible to search for air baggage, inspect cargo or mail at a port or airport, and search for containers loaded with import/export cargo.

The non-destructive inspection system 100 is configured to irradiate the subject 122 with radiation, detect the radiation that has passed through the subject 122 to obtain image information about the subject 122 .

The radiation generator 110 may be configured to generate X-rays and neutron beams, or to generate neutron beams.

For example, after an electron beam generated from an electron gun is accelerated by an electron accelerator, the accelerated electron beam may collide with a target to form radiation from the target.

The radiation generating device 110 is formed to selectively generate at least one of several types of radiation. The radiation generating device 110 is configured to alternately generate X-rays and neutron rays among various types of radiation with a time difference.

For example, X-rays and neutron rays may be configured to be irradiated alternately with each other with a time difference of 300 to 400 Hz.

The radiation generator 110 does not require equipment for each type of radiation in order to generate several types of radiation, but only one electron gun, one electron accelerator, and multiple radiation generating target mixtures are required.

Also, the radiation generator 110 may include at least one collimator (not shown). The collimator (not shown) is disposed between the target and the radiation detector, and serves to process radiation generated from the target system to be suitable for non-destructive inspection.

X-rays may be irradiated to the subject 122 to retrieve shape information of the subject 122 .

The neutron beam may be irradiated to search for material information of the subject 122 , for example, PVC, Graphite, Sugar, Wood, Glass, radioactive materials, explosives, narcotics, and the like.

The non-destructive inspection system 100 includes a radiation generating device 110 and a gamma ray measuring device 120 .

The radiation generator 110 includes a housing 111 and a radiation irradiator 113 .

The housing 111 forms the exterior of the radiation generating device 110 . The housing 111 may be formed in a hexahedral shape. The housing 111 includes a front surface, a rear surface, a left surface, a right surface, an upper surface and a lower surface.

The radiation irradiator 113 is installed to be accommodated in an accommodation space formed inside the housing 111 .

The radiation irradiator 113 is configured to generate neutrons to irradiate the subject 122 .

The housing 111 may be implemented as a shielding member 112 . The shielding member 112 may form a front surface, a rear surface, a left surface, a right surface, an upper surface, and a lower surface of the housing 111 .

An irradiation slot 114 is formed on the front surface of the housing 111 . The irradiation slot 114 may extend in the vertical direction of the housing 111 . Irradiation slot 114 is formed in the form of a narrow width in the left and right direction and a long length in the vertical direction.

The irradiation slot 114 is made to pass the neutrons irradiated from the radiation irradiator 113 .

The shielding member 112 is configured to shield neutrons radiated in all directions from the radiation irradiator 113 and gamma rays generated by the neutrons, except for neutrons passing through the irradiation slot 114 .

Accordingly, by preventing the neutron beams and gamma rays radiated in all directions from the radiation irradiator 113 from moving to the subject 122 , noise can be removed when detecting the gamma rays passing through the subject 122 .

The gamma ray measuring device 120 includes a frame 121 , a gamma ray detector 123 , a detector support 124 , a detector driver 137 , a subject support 147 , and a subject driver 153 .

The frame 121 may be formed in a rectangular parallelepiped shape by assembling a plurality of square pipes. The inside of the square pipe forms an empty space to reduce the weight. In order to increase the rigidity of the frame 121 , the plurality of square pipes may include a plurality of first pipes 1211 to third pipes 1213 .

The plurality of first pipes 1211 are disposed perpendicularly to the four corners of the cuboid to form front, rear, left, and right side corner portions of the frame 121 .

The plurality of second pipes 1212 extend in the front-rear and left-right directions on the upper portion of the rectangular parallelepiped, and connect the upper ends of each of the plurality of first pipes 1211 .

The plurality of third pipes 1213 extend in the front-rear and left-right directions at the lower portion of the rectangular parallelepiped, and may include a plurality of third pipes 1213 connecting the lower portions of the plurality of first pipes 1211 . .

A frame upper plate 1215 is installed at the upper end of the frame 121 to cover the upper portion of the frame 121 . The frame upper plate 1215 is configured to support the gamma ray detector 123 and the detector driver 137 .

An opening 1216 is formed in the frame upper plate 1215 to penetrate in the vertical direction. The opening 1216 may be formed in a rectangular shape in the center of the frame upper plate 1215 .

According to this configuration, the frame 121 can support the load of the gamma-ray detector 123 , the subject 122 , various supporting parts, and the driving part.

A plurality of casters 167 may be installed at the lower end of the frame 121 . The plurality of casters 167 may be installed at the lower end of the first pipe 1211 . The caster 167 is provided with wheels, so that the frame 121 can be easily moved.

According to this configuration, it is easy to adjust the distance and position between the radiation generating device 110 and the gamma ray measuring device 120 .

For example, when the irradiation slot 114 through which the neutron beam passes in the radiation generating device 110 and the particles shroud 1611 of the shielding unit 160 to be described later do not match each other, the irradiation slot 114 and the particles trough The frame 121 can be moved so that 1611 is aligned in the front-rear direction.

An object of the present invention is to detect dangerous substances by measuring gamma rays (immediate gamma rays) immediately generated from the subject 122 by irradiating only the subject 122 using neutrons.

Therefore, in order to minimize the effect of radiation of objects other than the inspected object 122 , the frame 121 is preferably made of aluminum or lead material, which does not emit radiation well.

Referring to Tables 1 to 4, which are the results of radiation evaluation simulation using Monte Carlo simulation (MCNP), the characteristics of radioactive nuclides by neutrons in SUS and carbon steel can be seen.

Table 1 shows the chemical composition of SUS-304 (NUREG/CR-3474).

Table 2 shows the radionuclide properties of SUS-304.

Table 3 shows the chemical composition of carbon steel (NUREG/CR-3474).

Table 4 shows the radionuclide properties of carbon steel.

In Tables 2 and 4, ε: electron capture, IT: isomeric transition

In the half-life, y means year, m means month, d means day, and h means hour.

Referring to Tables 2 and 4, the use of SUS and carbon steel is excluded because Mn, Cr, Co, and Fe possessed by SUS and carbon steel remain in the material for a long time after being irradiated. Instead, in order to minimize the radiation problem, in the present embodiment, the frame 121 may be formed of one of aluminum and lead or a combination of two materials.

According to this configuration, the frame 121 is formed of a material such as aluminum or lead, which is advantageous in terms of radiation safety of the non-destructive inspection system 100 .

The subject 122 may be disposed on the frame 121 .

A plurality of gamma-ray detectors 123 are provided on the frame 121 .

When neutrons are irradiated to the subject 122 , gamma rays may be generated inside the subject 122 .

The gamma ray detector 123 is configured to detect gamma rays generated from the subject 122 irradiated with neutrons.

Gamma rays provide information and location of the material of the subject 122 . Since the amount or size of gamma rays is different for each substance, it is possible to identify each substance through gamma rays.

For example, the subject 122 may be a cargo. The cargo may be formed in a box shape. Various shapes and types of materials can be accommodated inside the box. If explosives or narcotics are stored inside the cargo, dangerous substances such as explosives can be detected according to the amount or size of gamma rays.

In addition, by detecting the time, position, and angle at which gamma rays are generated, the position of an explosive or the like can be measured.

In addition, by utilizing the image of the gamma-ray detected using a Compton camera, etc., the location of the explosive or the like due to the location of the gamma-ray generation can be detected.

The plurality of gamma ray detectors 123 may be installed to be spaced apart from each other in the left and right directions with the object 122 loaded on the same plane as the frame upper plate 1215 therebetween.

The plurality of gamma-ray detectors 123 may be installed on the lower plate 163 of the shield part, which will be described later. The lower plate 163 of the shielding unit 160 may have a smaller size than the frame upper plate 1215 .

The lower plate 163 of the shielding unit 160 may be installed to overlap the frame upper plate 1215 in the vertical direction. In this case, the opening 1216 of the lower plate 163 of the shielding unit 160 may be formed to correspond to the opening 1216 of the upper plate 1215 of the frame.

The plurality of gamma ray detectors 123 may be disposed to be spaced apart from each other in the left and right directions with the opening 1216 of the frame upper plate 1215 interposed therebetween. The plurality of gamma-ray detectors 123 may be disposed to be spaced apart from each other in the left and right directions with an object support plate 148 disposed on the same plane as the frame upper plate 1215 therebetween.

Two of the plurality of gamma-ray detectors 123 may be respectively disposed on the left and right sides of the opening 1216 on the same plane of the frame upper plate 1215 .

The plurality of gamma ray detectors 123 respectively disposed on the left and right sides of the opening 1216 or the subject support plate 148 may be disposed adjacent to each other in the front-rear direction and spaced apart from each other.

The plurality of gamma-ray detectors 123 are installed to be movable toward the subject 122 .

The plurality of detector supporters 124 are configured to movably support at least one gamma-ray detector 123 per each detector supporter 124 on the frame upper plate 1215 .

In the present embodiment, the detector support 124 may support two gamma-ray detectors 123 .

The detector support 124 includes a plurality of LM guides 125 and a plurality of support plates 130 to movably support the gamma ray detector 123 .

The LM guide 125 may be installed on the frame upper plate 1215 or the lower plate 163 of the shielding unit 160 .

The LM guide 125 may include a guide rail 126 , a guide block 127 , and a guide ball 128 .

The guide rail 126 may extend in a straight line in the left and right directions of the frame upper plate 1215 . The guide rail 126 may be fixed to the frame upper plate 1215 .

The guide block 127 is slidably coupled along the guide rail 126 .

A plurality of guide balls 128 are provided to be arranged in a line inside the guide block 127 . The plurality of guide balls 128 are configured to be cyclically movable in the form of a loop on the inside of the guide block 127 . The plurality of guide balls 128 may be configured to circulate between a groove formed in the side surface of the guide rail 126 and a ball circulation groove 129 formed in the guide block 127 .

The plurality of support plates 130 are configured to support the gamma ray detector 123 .

The plurality of support plates 130 may include a first support plate 131 , a second support plate 132 , a connecting plate 133 , a lower support plate 134 , and a reinforcing plate 135 .

The first support plate 131 is configured to mount the gamma ray detector 123 .

The gamma-ray detector 123 may be vertically disposed to face the subject 122 . The plurality of gamma-ray detectors 123 may be disposed to face each other in the left and right directions.

The gamma-ray detector 123 may be configured to be surrounded by a shield 136 .

A detector receiving groove may be formed in the central portion of the shield 136 . The detector receiving groove is formed to be recessed in the same size as the gamma ray detector 123 , so that the gamma ray detector 123 may be accommodated therein.

The shielding body 136 may protect the gamma ray detector 123 from gamma rays generated from the subject 122 by wrapping the upper and lower/front and rear sides of the gamma ray detector 123 in all directions.

In addition, the shield 136 wraps one side of the gamma ray detector 123 in the left and right directions, so that gamma rays are incident on the gamma ray detector 123 , but the incident gamma rays do not pass through the gamma ray detector 123 .

However, since the neutron beams must be incident in the direction in which the gamma ray detector 123 faces the subject 122 , the shield 136 does not cover the side of the gamma ray detector 123 in the neutron incidence direction.

The gamma ray detector 123 may be attached to one side of the first support plate 131 in the left and right directions.

The second support plate 132 is disposed to be spaced apart from the first support plate 131 in the left and right directions.

The plurality of connection plates 133 are disposed between the first support plate 131 and the second support plate 132 . Each of the plurality of connecting plates 133 extends in the left and right directions between the first and second support plates 131 and 132 to connect the first and second support plates 132 .

The plurality of connecting plates 133 may be disposed to be spaced apart from each other in the front-rear direction.

The lower support plate 130 is mounted on the plurality of guide blocks 127 . The lower support plate 130 is disposed under the second support plate 132 . The second support plate 132 and the lower support plate 130 may be vertically connected to each other.

The reinforcing plate 135 is configured to connect the second support plate 132 and the lower support plate 130 .

One side of the reinforcing plate 135 is disposed to face one side in the left and right direction of the second support plate 132 , and is connected to the second support plate 132 , and the lower end of the reinforcing plate 135 is the lower support plate 130 . It is disposed to face the upper surface, and is connected to the lower support plate 130 .

The second support plate 132 , the reinforcing plate 135 , and the lower support plate 130 may be disposed perpendicular to each other in the X-axis, Y-axis, and Z-axis directions in the Cartesian coordinate system.

According to this configuration, the reinforcing plate 135 can effectively increase the support strength between the second support plate 132 and the lower support plate 130 with a minimum area.

The plurality of support plates 130 may be integrally coupled to each other. The plurality of support plates 130 may be mounted on a plurality of guide blocks 127 spaced apart from each other in the front-rear direction by the lower support plate 130 .

The gamma-ray detector 123 is supported by the guide block 127 by the plurality of support plates 130 , and the guide block 127 is slidably coupled along the guide rail 126 .

According to this configuration, the gamma-ray detector 123 may be horizontally moved (moved in the left and right directions) by the LM guide 125 .

The gamma ray detector 123 can more accurately detect the position, angle, etc. of gamma rays generated from the subject 122 by moving close to or away from the subject 122 . .

The detector driver 137 generates a rotational force to drive the gamma ray detector 123 .

To this end, the detector driving unit 137 may implement the front wheel 138 or the driving motor 139 .

The front wheel 138 may be rotated by a user's manual operation.

The driving motor 139 is configured to generate rotational force by receiving electric energy.

The detector driver 137 may transmit power to the detector support 124 by the ball screw 140 .

The central portion of the front wheel machine 138 may be connected to one end of the screw shaft 141 of the ball screw 140 to rotate the ball screw 140 .

Alternatively, the rotating shaft of the driving motor 139 may be connected to one end of the screw shaft 141 of the ball screw 140 to rotate the ball screw 140 .

The ball screw 140 is configured to convert the rotational motion generated by the detector driving unit 137 into a linear motion.

The ball screw 140 includes a screw shaft 141 and a nut portion 143 .

The screw shaft 141 has a spiral groove formed on the outer peripheral surface of the cylindrical shaft in a spiral direction.

The nut part 143 is slidably coupled along the screw shaft 141 .

A plurality of screw balls 142 are provided inside the nut portion 143 . Here, the screw ball 142 of the ball screw 140 may be referred to as a screw ball 142 to distinguish it from the ball of the LM guide 125 .

The plurality of screw balls 142 are mounted on the inside of the nut part 143 to be in rolling contact with the spiral groove of the screw shaft 141 in a spherical shape. The plurality of screw balls 142 may be circulated along the circulation groove formed inside the nut unit 143 .

The plurality of screw balls 142 may minimize friction when the nut portion 143 slides along the screw shaft 141 .

The nut part 143 may be formed in a cylindrical shape. At one end of the nut portion 143 , the flange portion 144 may be formed to protrude in both radial directions (front and rear directions).

Both ends of the screw shaft 141 may be rotatably supported by bearings.

The stopper 145 may be installed on the frame upper plate 1215 or the lower plate 163 of the shielding unit 160 .

The stopper 145 may be disposed adjacent to any one of a plurality of bearings supporting the screw shaft 141 .

The stopper 145 may be formed in a rectangular shape. A cylindrical accommodating hole 1451 may be formed inside the stopper 145 . The accommodation hole 1451 may be formed to be slightly larger than the diameter of the nut portion 143 to accommodate the nut portion 143 .

The screw shaft 141 may pass through the receiving hole 1451 of the stopper 145 to be supported by the bearing. The nut part 143 may be accommodated in the receiving hole 1451 of the stopper 145 when sliding in one direction along the screw shaft 141 .

When the nut part 143 is accommodated in the receiving hole 1451 , the flange part 144 of the nut part 143 is caught by one end of the stopper 145 , so that sliding of the nut part 143 may be stopped.

The nut portion 143 may be connected to the detector support 124 by a connector 146 .

The connector 146 may be configured to include a vertical rod 1461 and a horizontal rod 1463 .

The vertical rod 1461 may be formed in a cylindrical shape. The vertical rod 1461 may extend upward from the nut part 143 .

A screw coupling part 1462 may be provided at the lower end of the vertical rod 1461 . The screw coupling portion 1462 may be formed in an annular ring shape.

The screw coupling part 1462 may be fastened to the nut part 143 by a fastening member such as a screw or press-fitted to prevent the nut part 143 from rotating relative to the screw shaft 141 .

The upper end of the vertical rod 1461 may be integrally connected with one end of the horizontal rod 1463 .

The horizontal rod 1463 may be formed in a cylindrical shape. The horizontal rod 1463 may extend horizontally from one side of the axial direction of the second support plate 132 to the upper end of the vertical rod 1461 , and may be connected to the vertical rod 1461 .

According to this configuration, the nut part 143 is connected to the detector support part 124 by the connector 146 , thereby preventing the nut part 143 from rotating relative to the screw shaft 141 .

Accordingly, rotation of the nut part 143 is limited, and as the screw shaft 141 rotates, the nut part 143 may slide in the left and right directions along the screw shaft 141 .

In addition, the ball screw 140 receives power from the detector driving unit 137 and converts the rotational motion into a linear motion, thereby moving the plurality of gamma ray detectors 123 toward the subject 122 to form the subject 122 and the gamma ray. The distance between the detectors 123 may be adjusted.

The controller may be connected to the plurality of gamma-ray detectors 123 by wire or wirelessly to enable bidirectional communication.

The controller may receive detection signals from the plurality of gamma-ray detectors 123 to detect a dangerous substance or a location inside the subject 122 .

The controller may detect a parallax, an angle, a position, and the like of detection of gamma rays received from the plurality of gamma ray detectors 123 , and may perform 2D/3D detection by sharing information of each detector.

The Compton camera may be connected to the control unit to enable bidirectional communication.

The Compton camera may obtain and display a 2D/3D image by receiving information on gamma rays generated from the subject 122 .

The subject support part 147 is provided inside the frame 121 .

The subject supporting part 147 is configured to support the subject 122 so as to be liftable.

The subject support unit 147 includes a subject support plate 148 , a mounting plate 150 , and a plurality of lifting guide bars 149 .

The subject support plate 148 may be formed in a plate shape. The subject support plate 148 is formed to correspond to the openings 1216 respectively formed in the frame upper plate 1215 and the lower plate 163 of the shielding unit 160 .

The subject support plate 148 and the opening 1216 may each have the same size and may be formed in a rectangular shape.

The subject support plate 148 may be accommodated in the opening 1216 and be formed to be surrounded by the frame upper plate 1215 and the lower plate 163 of the shielding unit 160 .

The mounting plate 150 may be fixedly installed on an inner lower portion of the frame 121 . The mounting plate 150 may be installed to be supported by the plurality of fourth pipes 1214 provided on the lower inner side of the frame 121 .

The fourth pipe 1214 is disposed between two third pipes 1213 that are arranged side by side in the front-rear direction. The fourth pipe 1214 extends in a direction transverse to the two third pipes 1213 in the front-rear direction. Both ends of the fourth pipe 1214 may be respectively connected to and supported by the two third pipes 1213 .

The plurality of lifting guide bars 149 may be formed in a cylindrical shape. The plurality of guide bars may be vertically arranged side by side in the vertical direction. The plurality of guide bars may be disposed to be spaced apart from each other in the front-rear direction.

An upper end of each of the plurality of lifting guide bars 149 may be connected to the subject support plate 148 .

The middle or lower portion of the elevating guide bar 149 may pass through the mounting plate 150 and protrude downward.

A plurality of sleeves 151 may be formed to protrude upward from the mounting plate 150 . The plurality of sleeves 151 may be formed in the form of a hollow circular pipe.

The sleeve 151 is made to surround the outer circumferential surface of the elevating guide bar 149 .

The outer circumferential surface of the elevating guide bar 149 may be slid in the vertical direction to enable surface contact along the inner circumferential surface of the sleeve 151 .

The plurality of sleeves 151 are respectively spaced apart from each other on the front side, the rear side, the left side and the right side of the mounting plate 150 , and the plurality of lifting guide bars 149 pass through the plurality of sleeves 151 to be slidable, respectively. can be combined.

According to this configuration, the subject support plate 148 and the lifting guide bar 149 penetrate the inside of the sleeve 151 and can move stably in the vertical direction.

The subject driving unit 153 may raise and lower the subject supporting part 147 in the vertical direction in order to elevate the subject 122 .

The subject driving unit 153 may be implemented as a front wheel unit 155 or a driving motor 154 . The front wheel gear 155 or the driving motor 154 may generate rotational force, respectively.

The subject driving unit 153 may transmit power to the subject supporting unit 147 through the drive shaft 156 , the rack gear 159 and pinion 158 , and the lifting shaft 157 .

The driving shaft 156 may be rotatably installed on the frame 121 and the mounting plate 150 . Both ends of the drive shaft 156 may be rotatably supported by bearings, respectively.

A first bearing among the plurality of bearings may be installed on the third pipe 1213 of the frame 121 , and a second bearing among the plurality of bearings may be installed on the mounting plate 150 .

A support block 152 may be installed on the mounting plate 150 . A second bearing may be installed inside the support block 152 .

The front end of the driving shaft 156 may be connected to the central portion of the front wheel unit 155 or may be connected to the rotation shaft of the driving motor 154 .

A pinion 158 may be rotatably installed at the rear end of the drive shaft 156 .

The lifting shaft 157 may be vertically disposed inside the plurality of lifting guide bars 149 in the vertical direction. The upper end of the lifting shaft 157 may be connected to the subject support plate 148 . The lower end of the lifting shaft 157 is a free end.

The lifting shaft 157 may pass through the support block 152 . A through hole is formed inside the support block 152 to penetrate in the vertical direction. The lifting shaft 157 is penetrated through the through hole of the support block 152 to move in the vertical direction.

The lifting shaft 157 may be supported so as to be movable up and down by the support block 152 .

The lifting shaft 157 can stably move up and down without shaking in the front and rear or left and right directions by the support block 152 .

A rack gear 159 may be formed on one side of the lifting shaft 157 . The rack gear 159 may extend in the vertical direction along the lifting shaft 157 . The rack gear 159 may be engaged with the pinion 158 .

According to this configuration, the drive shaft 156 may be rotated by receiving power from the subject driving unit 153 . As the drive shaft 156 rotates, the pinion 158 coupled to the rear end of the drive shaft 156 may rotate.

Subsequently, the rack gear 159 meshed with the pinion 158 may move in the vertical direction.

Subsequently, as the rack gear 159 moves up and down, the lifting shaft 157 moves up and down, so that the test subject support plate 148 may move up and down.

The subject support plate 148 may move vertically between a first position and a second position inside the frame 121 .

The first position is a position lower than the frame upper plate 1215 . The second position is located on the same plane as the frame upper plate 1215 or the lower plate 163 of the shielding unit 160 .

The lower inner portion of the frame 121 is opened in the front-rear direction, so that the inspected object 122 such as cargo can be transferred to a first position of the inner lower portion of the frame 121 .

The subject support plate 148 may be supported at a first position, and the subject 122 may be seated on the subject support plate 148 .

When a fixing means (not shown) is provided on the object support plate 148 to be inspected, the object 122 may be more stably fixed by the fixing means.

After the subject 122 is loaded on the subject supporting plate 148 , the subject supporting plate 148 may rise to the second position.

The subject support plate 148 may be stopped at the second position.

In a state where the subject 122 is positioned at the second position above the frame 121 , a neutron beam is irradiated to the subject 122 , and the gamma ray detector 123 detects gamma rays using a neutron radiation analysis method. can do.

The control unit may receive a detection signal from a plurality of gamma-ray detectors 123, obtain information such as the size of gamma rays, detect whether explosives, gunpowder, etc. are included in the cargo, and measure the location of explosives, etc. .

When neutrons are irradiated from the radiation irradiator 113 to the subject 122, a gamma ray detector from background gamma rays generated by colliding with foreign substances in the air In order to protect the 123 , the shield 160 is configured to surround the plurality of gamma-ray detectors 123 .

The shielding part 160 may be formed in a box shape of a hollow rectangular parallelepiped. The plurality of gamma-ray detectors 123 and the subject 122 may be accommodated inside the shielding unit 160 .

The shielding unit 160 may include a plurality of sidewalls 161 , an upper plate 162 , and a lower plate 163 .

The plurality of sidewalls 161 may form front, rear, left, and right side surfaces of the shielding unit 160 . The sidewall 161 may have a constant thickness.

A particle shroud 1611 may be formed on the rear sidewall 161 forming the rear side of the shielding unit 160 among the plurality of sidewalls 161 . The mouth block 1611 may have a narrow width and may extend relatively long in the vertical direction of the side wall 161 .

The particle shroud 1611 is configured to pass the neutron beam irradiated from the radiation generator 110 into the shielding unit 160 .

The upper plate 162 is made to cover the upper portion of the side wall 161 . The upper plate 162 may be coupled to the upper portion of the side wall 161 .

A plurality of reinforcing ribs 1621 may be formed to protrude in a grid shape from the outer surface of the upper plate 162 .

A plurality of traction holes 1622 may be respectively formed in the plurality of reinforcing ribs 1621 . The traction hole 1622 is made to fit a traction ring such as a crane.

According to this configuration, the reinforcing rib 1621 may increase the rigidity of the upper plate 162 .

The traction hole 1622 can easily assemble the top plate 162 on the plurality of side walls 161 upper portions.

An opening 1216 may be formed inside the lower plate 163 . The opening 1216 formed in the lower plate 163 is formed to communicate with the opening 1216 of the frame upper plate 1215 . The opening 1216 of the lower plate 163 is configured to put the test object 122 supported so as to be liftable into the inside of the shielding unit 160 . The opening 1216 of the lower plate 163 may be referred to as an object input hole.

The sidewall 161 of the shielding unit 160 may include an outer shielding wall 164 , an inner shielding wall 165 , and a shielding block 166 .

The outer shield wall 164 forms the exterior of the side wall 161 . The inner side wall 161 is disposed inside the outer shield wall 164 . The shielding block 166 may be disposed between the outer shielding wall 164 and the inner shielding wall 165 to fill a space between the two shielding walls.

The shielding block 166 may be formed to be thicker than the outer shielding wall 164 and the inner shielding wall 165 .

The shielding block 166, the outer shielding wall 164, and the inner shielding wall 165 may be formed of a lead material.

According to this configuration, the shielding unit 160 forms a shielding wall between the radiation generating device 110 and the gamma ray detector 123 , thereby shielding the background gamma rays from entering the shielding unit 160 .

Therefore, according to the present invention, it is possible to accurately detect dangerous substances by increasing the inspection efficiency, increasing the analysis rate, and reducing the measurement error rate of the non-destructive test compared to the existing non-destructive testing equipment for explosives and narcotics.

In addition, it is possible to easily detect dangerous substances, for example, explosives, narcotics, and radioactive substances, which are difficult to identify the shape of various cargoes.

In addition, since the subject support 147 supports the subject 122 to be lifted and lowered, the subject 122 can be easily replaced, loaded, or removed without removing the shield 160 .

In addition, the subject support plate 148 and the shielding unit 160 are formed of a material that is difficult to emit radiation such as lead, thereby shielding background gamma rays to remove noise.

In addition, the plurality of gamma-ray detectors 123 are connected to each other and share information about the position, angle, etc. of gamma rays generated when neutrons pass through the subject 122 , thereby analyzing the difference in the generation time of gamma rays, etc. position can be accurately identified.

Moreover, since the plurality of gamma-ray detectors 123 are movably supported toward the subject 122 , it is easy to access the area of interest for the dangerous object.

In addition, the frame 121 supporting the gamma ray detector 123 and the subject 122 is made of a material that does not easily irradiate such as aluminum and lead, so that only the subject 122 is irradiated using neutrons, Hazardous substances can be accurately detected by measuring the instantaneous gamma rays generated through radiation.

In addition, by forming the material of the frame 121 with aluminum and lead material instead of SUS or carbon steel, which is good for radiation, it is possible to minimize the effect of radiation of objects other than the subject 122, and the gamma ray measuring device 120 ) is advantageous in terms of radiation safety, such as radiation problems, when used as a mobile type.

100: non-destructive inspection system 110: radiation generating device
111: housing 112: shielding member
113: radiation irradiation unit 114: irradiation slot
120: gamma ray measuring device 121: frame
1211: first pipe 1212: second pipe
1213: third pipe 1214: fourth pipe
1215: frame top 1216: opening
122: subject 123: gamma ray detector
124: detector support 125: LM guide
126: guide rail 127: guide block
128: guide ball 129: ball circulation groove
130: support plate 131: first support plate
132: second support plate 133: connection plate
134: lower support plate 135: reinforcing plate
136: shielding body 137: detector driving unit
138: front wheel 139: drive motor
140: ball screw 141: screw shaft
142: screw ball 143: nut part
144: flange portion 145: stopper
1451: receiving hole 146: connector
1461: vertical rod 1462: screw coupling part
1463: horizontal rod 147: subject support part
148: subject support plate 149: elevating guide bar
150: mounting plate 151: sleeve
152: support block 153: test object driving unit
154: drive motor 155: front wheel
156: drive shaft 157: elevating shaft
158: pinion 159: rack gear
160: shield 161: side wall
1611: lips chain 162: top plate
1621: reinforcing rib 1622: traction hole
163: lower plate 164: outer shielding wall
165: inner shield wall 166: shield block
167 : Caster

Claims (22)

frame;
a gamma ray detector installed on the upper portion of the frame and configured to detect gamma rays generated from an object irradiated with neutrons;
a detector support for movably supporting the gamma-ray detector on an upper horizontal surface of the frame; and
and a subject support part supporting the subject to be lifted and lowered so that the subject is located on the same plane as the gamma ray detector under the frame. According to claim 1,
The gamma ray detector is provided in plurality, and the gamma ray measuring apparatus is disposed to be spaced apart from each other in the front-rear direction and the left-right direction with the subject being interposed therebetween. According to claim 1,
The detector support portion,
a plurality of LM guides supporting the gamma-ray detector to be linearly movable in a horizontal direction; and
and a support plate mounted on the plurality of LM guides to support the gamma ray detector so as to be linearly movable toward the subject. According to claim 1,
The LM guide is
a plurality of guide rails;
a guide block sliding along the plurality of guide rails;
Gamma-ray measuring apparatus including a plurality of guide balls provided inside the guide block and in rolling contact with the guide rail. According to claim 1,
detector driver; and
and a ball screw configured to receive power from the detector driving unit, convert rotational motion into linear motion, and drive the gamma-ray detector to enable linear motion. 6. The method of claim 5,
The ball screw is
a screw shaft rotating by receiving power from the detector driving unit;
a nut portion having a plurality of screw balls in rolling contact with the spiral groove formed in the screw shaft and sliding in the axial direction of the screw shaft; and
and a connector connecting the nut part and the detector support part. 6. The method of claim 5,
The detector driving unit is a gamma ray measuring device implemented as a driving motor or a front wheel. According to claim 1,
The subject support part,
a subject support plate moving in the vertical direction between the lower portion of the frame and the subject input hole formed at the upper portion of the frame; and
and a plurality of elevating guide bars extending downward from the subject support plate and supporting the subject support plate to be elevated. 9. The method of claim 8,
a mounting plate disposed to be spaced apart from the subject support in the downward direction and installed under the frame; and
and a plurality of sleeves formed to protrude from the mounting plate and surrounding each of the plurality of lifting guide bars. According to claim 1,
subject driving unit;
and a power transmission unit configured to receive power from the subject driving unit, convert rotational motion into vertical linear motion, and transmit power to the subject support unit so that the subject can ascend and descend. 11. The method of claim 10,
The power transmission unit,
a pinion connected to the target driving unit and rotatably installed at a lower portion of the frame; and
and a rack gear extending downward from the support part to be inspected and engaged with the pinion. 11. The method of claim 10,
The subject driving unit is a gamma ray measuring device implemented as a driving motor or a front wheel. According to claim 1,
The gamma ray measuring apparatus further comprising a shielding unit accommodating the gamma ray detector inside and shielding a background gamma ray to be incident on the gamma ray detector. 14. The method of claim 13,
The shielding part,
a plurality of side walls forming front and rear left and right sides;
an upper plate formed to cover upper portions of the plurality of sidewalls;
A gamma ray measuring device including a lower plate having a subject input hole therein. 14. The method of claim 13,
The shielding part,
outer shield wall;
an inner shielding wall disposed inside the outer shielding wall; and
and a shielding block disposed between the outer shielding wall and the inner shielding wall,
The shielding block has a greater thickness than the thickness of the outer shielding wall and the inner shielding wall. 14. The method of claim 13,
The shielding unit includes a particle trap on one side so that the neutrons are incident on the object to be inspected. 16. The method of claim 15,
The shielding block is formed of a lead material,
The shielding wall is a gamma ray measuring device formed of an aluminum material. According to claim 1,
The upper plate and the lower plate is a gamma ray measuring device formed of a lead material. According to claim 1,
The frame is a gamma ray measuring device formed of aluminum or lead material. According to claim 1,
The gamma-ray measuring apparatus further comprising a plurality of casters installed at the lower end of the frame to movably support the frame. a radiation generator for generating neutrons and irradiating the subject;
and a gamma ray measuring device disposed adjacent to the radiation generating device and measuring gamma rays generated from the subject,
The gamma-ray measuring device,
frame;
a gamma ray detector installed on the upper portion of the frame and configured to detect gamma rays generated from the subject irradiated with the neutrons;
a detector support for movably supporting the gamma-ray detector on an upper horizontal surface of the frame; and
and a subject support part supporting the subject so that the subject is located on the same plane as the gamma ray detector at a lower portion of the frame. 22. The method of claim 21,
The radiation generator,
and a housing having an irradiation slot for accommodating a radiation irradiator and passing the neutrons irradiated from the radiation irradiator toward the subject,
The housing includes a shielding member forming a front surface, a rear surface, and left and right side surfaces, an upper surface and a lower surface provided with the irradiation slot, wherein the shielding member shields the neutrons.

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