JP7319064B2 - Radiographic inspection equipment - Google Patents

Description

An embodiment of the present invention relates to a radiological examination apparatus that detects radiation transmitted through a subject and forms an image of the subject.

Radiation inspection equipment that performs non-destructive inspection of the subject by irradiating the subject with radiation represented by X-rays and detecting and imaging the two-dimensional distribution of the radiation attenuated by passing through the subject. Are known. For example, when the subject is a wound structure such as a lithium ion battery, the radiation inspection apparatus inspects the internal dimensions and foreign matter of the wound structure in-line. As a result, it is possible to detect winding misalignment of the wound structure, tab misalignment of electrodes, etc., and foreign matter inside the wound structure.

Japanese Patent No. 4829949

A conventional radiological examination apparatus accommodates a radiation source that irradiates a subject with radiation, a detector that is provided facing the radiation source and detects radiation that has passed through the subject, a radiation source and a detector, and an external detector. A shielding box that shields the radiation leaking into the shielding box, the subject is carried into the shielding box, transported to the inspection position between the radiation source and the detector, and the subject that has been inspected is carried out of the shielding box. and a transport mechanism. Conventionally, this transport mechanism includes a transport section that sequentially transports the test objects arranged at a predetermined pitch inside the shielding box to a detection position in a circular orbit, a loading part that transports the test object into the shielding box, and an unloading section for unloading the subject to the outside of the shielding box. Further, the transport mechanism has a relay unit, and this relay unit serves as a mechanism for transferring the subject from the loading unit to the transport unit and from the transport unit to the unloading unit. As described above, the conventional radiographic examination apparatus has a complicated apparatus configuration and a large weight.

Therefore, it was considered to make the transport mechanism a mechanism that forms a single transport path to simplify and reduce the weight of the apparatus. If the entrance and the exit are close to the inspection position, the radiation irradiated to the subject at the inspection position is scattered, and there is a problem that the dose of radiation leaking through the entrance and the exit increases. .

An object of the present embodiment is to provide a radiation inspection apparatus capable of simplifying and reducing the weight of the apparatus configuration and reducing the leakage dose of radiation in order to solve the above-described problems.

A radiological examination apparatus according to this embodiment includes a radiation source, a detector provided opposite to the radiation source, and a linear transport passing through an examination position of the subject between the radiation source and the detector. A transport mechanism having a path for transporting the subject, a shielding box surrounding the radiation source and the detector, and an entrance provided in the shielding box for transporting the subject into the shielding box. an outlet provided in the shielding box for carrying out the subject to the outside of the shielding box; and a shielding member for shielding scattered radiation scattered from the subject when the subject is irradiated with radiation from the radiation source. and, the transport mechanism includes a linear carry-in route passing through the carry-in port, a straight carry-out route passing through the carry-out port, and an intermediate route connecting the transport route and the carry-in route or the carry-out route. , wherein the carry-in entrance, the carry-out exit, the carry-in route, and the carry-out route are shifted from an extension line of the carry-in route, and the carry-in inlet, the carry-out outlet, the carry-in route, and the carry-out route is a horizontal direction or a vertical direction, and the intermediate path is perpendicular to the conveying path.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows an example of a structure of the radiological examination apparatus which concerns on 1st Embodiment. It is a top view which shows an example of a structure of the radiographic inspection apparatus which concerns on 2nd Embodiment. It is a side view which shows an example of a structure of the radiological examination apparatus which concerns on 3rd Embodiment. It is a top view which shows an example of a structure of the radiological examination apparatus which concerns on 4th Embodiment. It is a top view which shows an example of a structure of the radiographic inspection apparatus which concerns on other embodiment. It is a top view which shows another example (part 1) of a structure of the radiological examination apparatus which concerns on other embodiment. It is a top view which shows another example (2) of a structure of the radiological examination apparatus which concerns on other embodiment. It is a top view which shows another example (3) of a structure of the radiological examination apparatus which concerns on other embodiment.

(First embodiment)
Hereinafter, the radiation inspection apparatus according to the first embodiment will be described in detail with reference to the drawings.

(composition)
FIG. 1 is a plan view showing an example of the configuration of a radiation inspection apparatus according to the first embodiment. The radiation inspection apparatus 1 irradiates the subject 100 with radiation, detects the radiation transmitted through the subject 100, and forms a fluoroscopic image of the interior of the subject 100 based on the detection results. The subject 100 is not particularly limited as long as it can be non-destructively inspected by radiation. Examples include cylindrical batteries, prismatic batteries, laminated batteries, aluminum electrolytic capacitors, electrochemical capacitors such as electric double layer capacitors, and the like. is a wound structure.

As shown in FIG. 1, this radiation examination apparatus 1 includes a radiation source 2, a detector 3, a shielding box 4, a transport mechanism 5, a processing device 6, and a display device 7. FIG. The radiation source 2, the detector 3, the shielding box 4, and the transport mechanism 5 are provided on a mounting table (not shown).

The radiation source 2 irradiates the subject 100 with a radiation beam. Radiation is, for example, X-rays. A radiation beam is a bundle of radiation that expands into a pyramidal shape with a focal point as the apex. This radiation source 2 is for example an X-ray tube. In the X-ray tube, a filament and a target such as tungsten are opposed to each other with a target angle of 0° or more in a vacuum. A tube current and a tube voltage according to imaging conditions are applied to the filament to emit an electron beam. The target generates X-rays from the impingement of accelerated electron beams.

A detector 3 is arranged opposite the focal point of the radiation source 2 . This detector 3 is composed of, for example, an image intensifier (I.I.) and a camera, or a flat panel detector (FPD). I. I. expands the surface of a scintillator made of cesium iodide or the like that emits light when excited by radiation two-dimensionally, converts the two-dimensional distribution of incident radiation into a fluorescent image, and multiplies the luminous intensity of the fluorescent image. The camera has an imaging device such as a CCD or CMOS arranged side by side to capture a fluorescence image. The FPD has photodiodes and TFT switches along the scintillator surface. The photodiode converts the fluorescent image into an electric charge and accumulates it, and the TFT switch outputs the electric charge accumulated in the photodiode when an ON signal is given.

That is, the detector 3 detects a two-dimensional distribution of radiation intensity that is attenuated according to the radiation transmission path, and outputs transmission data proportional to the radiation intensity. The transmission data is the radiation intensity, the amount of charge indicating the radiation intensity, or the luminance value indicating the radiation intensity, and is digitized into, for example, 256 gradations.

Two sets of the radiation source 2 and the detector 3 are provided here, and are provided side by side so that the irradiation direction of the radiation source 2 is parallel. For example, one set of radiation sources 2 and detectors 3 images the upper part of the subject 100 and the other set of radiation sources 2 and detectors 3 images the lower part of the subject 100 .

A shielding box 4 encloses the radiation source 2 and the detector 3 and shields the radiation. The shielding box 4 is composed of a radiation shielding material such as lead. The shielding box 4 has, for example, a rectangular parallelepiped shape. The shielding box 4 is provided with a carry-in port 41 for carrying the subject 100 inside and a carry-out port 42 for carrying out the subject 100 inside. The carry-in port 41 and the carry-out port 42 are, for example, rectangular cutouts provided on two opposing surfaces of a rectangular parallelepiped. The carry-in port 41 and the carry-out port 42 are shifted from an extension line of the transport path 52 described later. This shift is a horizontal shift. In other words, the shift direction is a direction orthogonal to the transport path 52 in the horizontal plane (the XY plane in FIG. 1) in which the mounting surface of the mounting table spreads.

The transport mechanism 5 is a mechanism that transports the subject 100 . The transport mechanism 5 is, for example, a conveyor such as a belt conveyor or a chain conveyor. When the subject 100 is a wound structure, the transport mechanism 5 transports the subject 100 in a state perpendicular to the horizontal plane. That is, the radiation of the radiation source 2 is applied to the curved surface of the wound structure (approximately multiple cylindrical body).

The transport path of the subject 100 of the transport mechanism 5 enters the shielding box 4 , bends, passes the inspection position P in a straight line, bends again, and extends outside the shielding box 4 . Specifically, the transport mechanism 5 includes a linear transport path 51 passing through the transport port 41, a linear transport path 52 passing through the inspection position P between the radiation source 2 and the detector 3, and a transport port 42. and an intermediate path 54 connecting the paths 51 and 52 and connecting the paths 52 and 53 . The inspection position P is a position where a straight line connecting the radiation source 2 and the detector 3 intersects the transport path 52 . Here, the irradiation direction of the radiation source 2 and the transport path 52 are orthogonal.

The paths 51 to 53 extend in the X-axis direction and are parallel, and the carry-in path 51 and the carry-out path 53 are shifted from the extension line of the transport path 52 . In this embodiment, the shift is a shift in the horizontal direction (Y-axis direction). In other words, it is the direction orthogonal to the transport path 52 in the horizontal plane on which the mounting surface of the mounting table spreads. The intermediate path 54 is a straight path extending obliquely with respect to the conveying path 52 .

The processing device 6 controls the radiation source 2 , the detector 3 and the transport mechanism 5 to image the subject 100 and generate an image of the subject 100 . The processing device 6 is a so-called computer, and is composed of a CPU, a storage such as an HDD or SSD, a RAM, and a driver circuit. The storage stores a program, the RAM expands the program, and temporarily stores data, the CPU processes the program, and the driver circuit supplies power to each part according to the processing result of the CPU.

The display device 7 is a monitor such as a liquid crystal display or an organic EL display. The display device 7 displays the image of the subject 100 generated by the processing device 6 on the screen.

(action)
The operation of the radiation inspection apparatus 1 of this embodiment will be described. Subjects 100 are provided at predetermined intervals on the transport path 52, and the transport mechanism 5 transports these subjects 100 in one direction. The radiation source 2 irradiates the subject 100 with radiation while the subject 100 is being transported. Under the control of the processing device 6 , the detector 3 detects radiation transmitted through the subject 100 when the subject 100 reaches the examination position P, and outputs transmission data to the processing device 6 . The processing device 6 generates a perspective image of the subject 100 from the transmission data and displays it on the screen of the display device 7 .

Here, when the subject 100 is irradiated with radiation from the radiation source 2, the radiation is scattered in all directions. This scattered radiation is called scattered radiation. The intensity of this scattered radiation varies depending on the following conditions (1) to (6).
(1) Inversely proportional to the square of the distance between the radiation source 2 and the subject 100 (FOD: Focus to Object Distance)
(2) Inversely proportional to the square of the distance from the scattering position on the subject 100 to the scattered radiation measurement point
(3) Proportional to direct radiation intensity from radiation source 2
(4) Changes depending on the material of the subject 100 (a substance with a large absorption coefficient has a large self-absorption and a small scattered radiation intensity)
(5) Scattering angle with respect to irradiation direction of radiation
(6) Proportional to the irradiation area of the subject 100 Generally, in order to obtain a high-quality fluoroscopic image, it is necessary to increase the magnification ratio and the S/N ratio. . In this case, the intensity of scattered radiation increases.

As described above, scattered rays are scattered in all directions, but the intensity of scattered rays scattered perpendicularly to the irradiation direction of radiation tends to be the greatest, especially when the subject 100 is a wound structure. This tendency is remarkable in some cases.

Therefore, in this embodiment, the carry-in port 41 , the carry-out port 42 , the carry-in route 51 and the carry-out route 53 are shifted from the extension line of the transport route 52 . As a result, the shielding box 4 shields the portion where the scattered radiation is the largest, so that the dose of radiation leaking to the outside of the shielding box 4 can be reduced.

For example, the tube voltage of the radiation source 2 is 150 kV, the distance (FOD) from the radiation source 2 to the nearest subject 100 is 80 mm, the distances L and L' from the inspection position P to the shielding box 4 are 250 mm, and the subject 100 is When a cylindrical lithium ion battery is used and the shift amounts D and D' of the inlet 41 and the outlet 42 are 400 mm, the inlet 41 and the outlet 42 are compared with the case without shift (D, D'=0). can be reduced to about 1/4.

(effect)
The radiation inspection apparatus 1 of this embodiment passes through a radiation source 2, a detector 3 provided facing the radiation source 2, and an inspection position P of the subject 100 between the radiation source 2 and the detector 3. A transport mechanism 5 that has a linear transport path 52 and transports the subject 100, a shielding box 4 that surrounds the radiation source 2 and the detector 3, and a shielding box 4 that carries the subject 100 inside the shielding box 4. and a carry-out port 42 provided in the shielding box 4 for carrying out the subject 100 to the outside of the shielding box 4 . It has a route 51 and a straight carrying-out route 53 passing through the carrying-out port 42 , and the carrying-in port 41 , the carrying-out port 42 , the carrying-in route 51 and the carrying-out route 53 are shifted from the extension line of the carrying route 52 . made it Specifically, the direction of shift of the carry-in port 41, the carry-out port 42, the carry-in route 51, and the carry-out route 53 was set to the horizontal direction.

This makes it possible to simplify and reduce the weight of the device configuration compared to conventional radiographic inspection devices that transport and inspect the subject 100 in a circular orbit. In addition, since the device configuration can be simplified, maintainability can be improved. In addition, even when the subject 100 is transported in a straight line, it is possible to reduce the leaked dose of radiation, particularly the leaked dose due to scattered radiation from the subject 100 at the entrance 41 and the exit 42. can.

(Modified example of the first embodiment)
In the first embodiment, the intermediate path 54 is a path extending obliquely to the conveying path 52 , but may be a path orthogonal to the conveying path 52 . As a result, the path of the transport mechanism 5 between the carry-in port 41 and the carry-out port 42 can be shortened, so that the size of the shielding box 4 can be reduced, and the installation area of the radiation inspection apparatus 1 can be reduced. can. In addition, the amount of radiation shielding material such as lead used for the shielding box 4 can be reduced, so the cost can be reduced.

(Second embodiment)
(composition)
A radiation inspection apparatus according to the second embodiment will be described in detail with reference to the drawings. The same reference numerals are assigned to the same configurations and the same functions as those of the first embodiment, and detailed description thereof will be omitted.

FIG. 2 is a plan view showing an example of the configuration of the radiation inspection apparatus 1 according to the second embodiment. As shown in FIG. 2, the radiation inspection apparatus 1 of this embodiment includes a shielding member 8. As shown in FIG. The shielding member 8 is a shielding plate 81 that shields scattered rays scattered from the subject 100 when the subject 100 is irradiated with radiation from the radiation source 2 . The shielding plate 81 is composed of a radiation shielding material such as lead.

A plurality of shielding plates 81 are provided here, and are provided on a line connecting the inspection position P and the edge of the carry-in port 41 and on a line connecting the inspection position P and the edge of the carry-out port 42. . In other words, the shielding plate 81 is provided so as to overlap a cone-shaped region formed by the inspection position P and the opening edge of the carry-in port 41 or the carry-out port 42 . This area has a quadrangular pyramid shape because the entrance 41 and the exit 42 are square here. The shielding plate 81 may be provided inside or outside the shielding box 4 as long as it is on the above line. For example, the shielding plate 81 may be provided inside the shielding box 4 and between the focal point of the radiation source 2 and the carry-in port 41 or the carry-out port 42 . It may be provided so as to be close, or may be provided so as to be closer to the carry-out route 53 than the edge of the carry-out port 42 .

(action/effect)
(1) The radiation inspection apparatus 1 of the present embodiment is provided with the shielding member 8 for shielding the scattered radiation scattered from the subject 100 when the subject 100 is irradiated with radiation from the radiation source 2 . Thereby, the leakage dose of radiation can be further reduced.

Further, for example, the 1/2 valence layer of X-rays with respect to lead, that is, the thickness of lead required to halve the X-ray leakage dose is about 0.3 mm when the tube voltage is 150 kV. When shifted under the same conditions of the morphology (FOD=80 mm, L=250 mm, D, D'=400 mm), the lead thickness required for shielding can be reduced by about 0.6 mm. In other words, by shifting the carry-in port 41, the carry-out port 42, the carry-in route 51, and the carry-out route 53 with respect to the transfer route 52, the thickness of the shielding plate 81 is reduced when the leakage dose is made the same. can reduce costs.

(2) The shielding member 8 (shielding plate 81 in this case) is provided on a line connecting the inspection position P and the edge of the carry-in port 41 or the carry-out port 42 . As a result, the path of the scattered radiation from the subject 100 to the entrance 41 or the exit 42 is blocked, so that the leakage dose of radiation can be further effectively reduced.

(Modification of Second Embodiment)
The shielding member 8 is a shielding plate 81 having a notch, and may be provided in the transport mechanism 5 so that the subject 100 passes through the notch. The shielding plate 81 is configured in a substantially U shape by providing a slit as a notch on one side of a rectangular plate-like body, for example. The shield plate 81 is provided, for example, so as to straddle at least one of the carry-in route 51 , the transfer route 52 , the carry-out route 53 , and the intermediate route 54 of the transport mechanism 5 . In other words, the shielding plate 81 is provided in the transport mechanism 5 so that the subject 100 passes through the notch of the shielding plate 81 . By providing such a shielding plate 81, the leakage dose of radiation can be further reduced. In particular, by providing the shield plate 81 so as to straddle the intermediate path 54, the area formed by the inspection position P and the loading port 41 or the loading port 42 (the region surrounded by the dashed line in FIG. 2) can be blocked. Therefore, the leakage dose can be further reduced.

(Third embodiment)
A radiation inspection apparatus according to the third embodiment will be described in detail with reference to the drawings. The same reference numerals are assigned to the same configurations and the same functions as those of the first embodiment, and detailed description thereof will be omitted.

FIG. 3 is a side view showing an example of the configuration of a radiological examination apparatus according to the third embodiment. As shown in FIG. 3, in the radiation inspection apparatus 1 of the present embodiment, the carry-in port 41, the carry-out port 42, the carry-in route 51, and the carry-out route 53 extend horizontally from the extension line of the transfer route 52 as in the first embodiment. It is not shifted in the direction, but shifted in the height direction from the extension line of the conveying path 52 . The height direction is a direction orthogonal to the horizontal plane (XY plane in FIG. 3) extending over the mounting table, and is the Z-axis direction in FIG. 3 here. Here, the transport path 52 is provided above the inlet 41 , the outlet 42 , the inlet path 51 , and the outlet path 53 .

In this way, even if the carry-in port 41, the carry-out port 42, the carry-in route 51, and the carry-out route 53 are shifted in the height direction, the apparatus configuration can be made smaller than that of the conventional radiographic inspection apparatus, as in the first embodiment. It is possible to simplify and reduce the weight, and reduce the leakage dose of radiation.

(Fourth embodiment)
A radiation inspection apparatus according to the fourth embodiment will be described in detail with reference to the drawings. The same reference numerals are assigned to the same configurations and the same functions as those of the second embodiment, and detailed description thereof will be omitted.

FIG. 4 is a plan view showing an example of the configuration of a radiological examination apparatus according to the fourth embodiment. As shown in FIG. 4, the transport path 55 of the transport mechanism 5 of this embodiment is a single straight path, enters the shielding box 4 from the carry-in port 41, passes through the inspection position P, and passes through the carry-out port. It goes out of the shielding box 4 from 42 . In other words, the carry-in port 41, the inspection position P, and the carry-out port 42 are provided on a straight line.

In the present embodiment, the shielding box 4 is provided with a shielding tunnel 82 extending outward from the entrance 41 and a shielding tunnel 83 extending outward from the exit 42 . The shielding tunnels 82 and 83 are one aspect of the shielding member 8 that replaces the shielding plate 81, and shields scattered rays. The shielding tunnels 82 and 83 are composed of a radiation-shielding material such as lead, and have, for example, a cylindrical shape. The length of the shielding tunnels 82, 83 can be set as appropriate. For example, the length is such that the leakage dose at the ends of the shielding tunnels 82 and 83 is sufficiently small.

According to this embodiment, the transport path of the transport mechanism 5 is linear, and the carry-in port 41, the inspection position P, and the carry-out port 42 are provided on a straight line. As a result, similar to the first embodiment, compared with the conventional radiation inspection apparatus, the apparatus configuration can be simplified and the weight thereof can be reduced, and maintainability can be improved.

In addition, since the intensity of the scattered radiation is inversely proportional to the square of the distance between the scattering position on the subject 100 and the scattered radiation measurement point, the provision of the shield tunnels 82 and 83 allows the actual entrance of the subject 100, Since one end of the shielded tunnels 82 and 83 serving as the outlet can be kept away from the inlet 41 and the outlet 42 which are the other ends of the shielded tunnels 82 and 83, the leakage dose of radiation can be reduced.

(Other embodiments)
Although embodiments of the invention have been described herein, the embodiments are provided by way of example and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. The embodiments and modifications thereof are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

For example, the shift amounts D and D' in the first to third embodiments may be the same or different. Alternatively, one of the carry-in route 51 and the carry-out route 53 may be shifted in the horizontal direction, and the other of the carry-in route 51 and the carry-out route 53 may be shifted in the height direction.

Also, the shielding member 8 (shielding plate 81) of the second embodiment may be applied to the modification of the first embodiment, the third embodiment, and the fourth embodiment.

In the fourth embodiment, the shielding tunnels 82 and 83 have one end at the inlet 41 and the outlet 42 and are provided so as to extend outside the shielding box 4 . . For example, the shielding tunnels 82 and 83 may be provided with one end extending toward the inspection position P as the loading entrance 41 and the delivery exit 42 and the other end positioned near the inspection position P. As shown in FIG. The other end is, for example, set to such an extent that it does not hit the conical radiation beam emitted from the nearest radiation source 2 . By extending the shielding tunnels 82 and 83 inside the shielding box 4 in this way, the scattered rays scattered from the subject 100 positioned at the inspection position P are shielded by the shielding tunnels 82 and 83. It is possible to reduce the leakage dose of radiation in the carry-out section 42 .

Further, in the first to fourth embodiments and modifications, the radiation source 2 and the detector 3 are arranged so that the irradiation direction of the radiation source 2 and the transport path of the subject 100 transported by the transport mechanism 5 are perpendicular to each other. Although the radiation source 2 is provided, the radiation source 2 may be provided with the irradiation direction of radiation oblique to the transport path. As a result, the scattered radiation in the strongest direction is removed from the entrance 41 and the exit 42 and is shielded by the shielding box 4, so that the leakage dose of radiation can be reduced.

Such a layout can be applied to any of the first to fourth embodiments and modifications. For example, as shown in FIG. 5, it may be applied to the first embodiment, and as shown in FIG. 6, it may be applied to the fourth embodiment. However, the shielding tunnels 82 and 83 are not necessarily required. Also, the irradiation direction of the radiation source 2 may be different for each set of the radiation source 2 and the detector 3 (see FIG. 6), or may be the same (see FIG. 5). That is, the irradiation directions may obliquely cross each other between the radiation source 2 and detector 3 pairs, or may be parallel to each other.

Moreover, as shown in FIG. 7, the radiological examination apparatus 1 may include an internal shielding box 40 that covers the combination of the radiation source 2 and the detector 3. As shown in FIG. The inner shielding box 40 is provided inside the shielding box 4 . The inner shielding box 40 includes a radiation shielding material such as lead, and has a rectangular parallelepiped shape, for example. An internal shielding box 40 covers each set of radiation source 2 and detector 3 . In other words, the examination position P is located inside the inner shielding box 40, and the inner shielding box 40 is provided with an entrance 40a and an exit 40b through which the subject 100 passes. By providing the inner shielding box 40 in this way, scattered rays scattered from the subject 100 positioned at the examination position P can be shielded, so that the amount of radiation leaked to the outside of the radiographic examination apparatus 1 can be reduced. In addition, since scattered radiation can be reduced by the inner shielding box 40, the thickness of the shielding member such as lead of the shielding box 4 can be reduced, so that the weight of the entire apparatus can be reduced. This internal shielding box 40 can also be applied to the fourth embodiment, as shown in FIG.

1 Radiation inspection device 2 Radiation source 3 Detector 4 Shielding box 40 Internal shielding box 40a Entrance 40b Exit 41 Carry-in port 42 Carry-out port 5 Transport mechanism 51 Carry-in route 52 Transport route 53 Carry-out route 54 Relay route 55 Transport route 6 Processing device 7 Display Apparatus 8 Shielding member 81 Shielding plate 82 Shielding tunnel 83 Shielding tunnel 100 Subject

Claims (7)

a radiation source;
a detector facing the radiation source;
a transport mechanism for transporting the subject, the transport mechanism having a linear transport path passing through an inspection position of the subject between the radiation source and the detector;
a shielding box surrounding the radiation source and the detector;
an entrance provided in the shielding box for carrying the subject into the shielding box;
a carry-out port provided in the shielding box for carrying out the subject to the outside of the shielding box;
a shielding member that shields scattered rays emitted from the radiation source to the subject and scattered from the subject;
with
The transport mechanism has a linear carry-in route passing through the carry-in port, a straight carry-out route passing through the carry-out port, and an intermediate route connecting the transport route and the carry-in route or the carry-out route,
The carry-in entrance, the carry-out exit, the carry-in route, and the carry-out route are shifted from an extension line of the conveying route,
a shift direction of the inlet, the outlet, the inlet route, and the outlet route is a horizontal direction or a height direction;
the intermediate path is orthogonal to the conveying path;
A radiographic examination device characterized by: The shielding member is provided on a line connecting the inspection position and the inlet or the edge of the outlet;
The radiation inspection apparatus according to claim 1 , characterized by: the shielding member is a shielding plate having a notch, and is provided in the transport mechanism so that the subject passes through the notch;
The radiation inspection apparatus according to claim 1 , characterized by: The shielding member is a shielding tunnel whose one end is the entrance and extends to the outside of the shielding box, or a shielding tunnel whose one end is the exit and extends to the outside of the shielding box;
The radiation inspection apparatus according to claim 1 , characterized by: The shielding member is a shielding tunnel whose one end is the entrance and extends inside the shielding box, or a shielding tunnel whose one end is the exit and extends inside the shielding box;
5. The radiation inspection apparatus according to claim 1 or 4 , characterized by: wherein the radiation source is provided with a radiation direction oblique to the transport path;
The radiation inspection apparatus according to any one of claims 1 to 5 , characterized by: an internal shielding box provided inside the shielding box and covering the radiation source and detector set;
The radiation inspection apparatus according to any one of claims 1 to 6 , characterized by:

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