WO2019177041A1

WO2019177041A1 - Radiation inspecting device, and baggage inspecting device

Info

Publication number: WO2019177041A1
Application number: PCT/JP2019/010329
Authority: WO
Inventors: 和朗 ▲高▼山; 真起高橋
Original assignee: 日本信号株式会社
Priority date: 2018-03-15
Filing date: 2019-03-13
Publication date: 2019-09-19
Also published as: JP2019158695A; JP6629372B2; CN111886493A

Abstract

An X-ray inspecting device 50, which is a radiation inspecting device, is provided with: an X-ray source 71, which is a radiation source that irradiates an object being inspected with X-rays, constituting radiation; an X-ray sensor unit 72, which is a radiation sensor unit that receives the radiation from the X-ray source 71; and a radiation shielding unit 82 which extends to the outside of an irradiation region, on the X-ray sensor unit 72 side, upon which radiation is directly incident, and which shields radiation scattered by the X-ray sensor unit 72. It is thus possible to reduce leakage of radiation resulting from scattering of radiation by the radiation sensor unit.

Description

Radiation inspection device and baggage inspection device

The present invention relates to a radiation inspection apparatus and a baggage inspection apparatus that inspect the inside of an object using X-rays or other radiation.

The baggage inspection device generally irradiates baggage with X-rays using an X-ray inspection device because an internal image can be obtained without opening even a metal bag. Especially in places where a lot of baggage needs to be inspected in a short time, such as at airports, a curtain made of a material that is difficult to transmit radiation is installed at the entrance of the inspection section instead of an interlocking door, and the inspection section is not completely sealed. In many cases, the method is adopted. The same applies to the X-ray apparatus for food inspection. In this case, although the amount of leakage specified by laws and regulations is lower, there is a problem that X-ray leakage from the entrance of the inspection unit is increased as compared with the door method.

In Patent Document 1, in a device used for X-ray fluoroscopy for detecting damage to a steel pipe, a pair of sheet-like X-ray transmissometers are sandwiched on an X-ray transmission plate extending in parallel near the steel pipe. An X-ray scattering prevention mask main body that extends in parallel is attached to function as a slit-shaped mask.

Patent Document 2 includes, as a radiation inspection apparatus, an inspection room having an opening for carrying in and out an object to be inspected, and a radiation irradiation apparatus for irradiating the inspection room with radiation, and a pair of parallel in the vicinity of the radiation incident part. There is disclosed an arrangement in which an extending L-shaped member is arranged to prevent the radiation incident on the examination room from the radiation incident portion from being scattered and flowing in the direction of the opening.

In Patent Document 3, as a radiation imaging apparatus, an anti-scattering grid is disposed between a subject and a film-like photosensitive portion on the opposite side of the subject with respect to a tube generating X-rays. Is disclosed. The scattering prevention grid is for removing scattered radiation from the subject side, and includes a plurality of X-ray absorption elements having different inclination angles.

However, the apparatus disclosed in

Patent Documents

1 and 2 removes scattered components when the subject is irradiated with X-rays, and the apparatus disclosed in Patent Document 3 removes scattered components from which X-rays enter the photosensitive portion. Thus, the X-ray scattering at the radiation sensor unit is not sufficiently considered. Although it is generally considered that the amount of X-ray scattering at the radiation sensor unit is very small, it is desirable to reduce the amount of X-ray leakage caused by such scattering even if the amount is small.

Japanese Utility Model Publication No. 5-81798 JP 2005-172486 A JP 2012-5839 A

The present invention has been made in view of the above points, and an object of the present invention is to provide a radiation inspection apparatus and a baggage inspection apparatus capable of reducing leakage of radiation caused by radiation scattering at the radiation sensor unit.

In order to achieve the above object, one aspect of a radiation inspection apparatus according to the present invention includes a radiation source that irradiates an object to be inspected, a radiation sensor unit that receives radiation from the radiation source, and radiation on the radiation sensor unit side. A radiation shielding part that extends outside the directly incident irradiation region and shields the radiation scattered by the radiation sensor part.

In the radiation inspection apparatus, since the radiation shielding unit shields the radiation scattered by the radiation sensor unit, leakage of radiation to the periphery of the radiation sensor unit due to the radiation sensor unit can be reduced. A sense of security can be enhanced.

In a specific aspect of the present invention, the detection surface of the radiation sensor unit extends linearly in a predetermined direction, and the radiation shielding unit faces along the longitudinal direction of the detection surface outside the detection surface of the radiation sensor unit. Extend in state. In this case, it is possible to limit the spread of the scattered radiation emitted in the direction orthogonal to the longitudinal direction of the line sensor-like detection surface.

In another aspect of the present invention, the radiation source and the radiation sensor unit are arranged at different height positions with respect to the vertical direction, a shielding box that houses the radiation source and the radiation sensor unit and shields radiation, and a radiation source, And a conveyance unit extending between the radiation sensor unit and a direction intersecting with the predetermined direction and extending between the entrance and the exit of the shielding box. In this case, the inspection can be performed while passing the inspection object between the radiation source and the radiation sensor unit in the shielding box by the transport unit.

In yet another aspect of the present invention, the radiation shielding portion protrudes with a predetermined width vertically downward from a base provided outside a pair of sides extending in the longitudinal direction of the detection surface of the radiation sensor portion, and extends in the longitudinal direction of the detection surface. It is a pair of strip-shaped flat members extending in parallel. In this case, the maximum inclination angle of the primary scattered radiation can be set to a desired value by appropriately adjusting the shape and arrangement of the flat plate member, and the arrival area of the primary scattered X-ray can be limited.

In still another aspect of the present invention, the predetermined width of the pair of flat plate members is set so as to prevent radiation scattered by the radiation sensor unit from directly entering the entrance and exit of the shielding box. In this case, leakage of radiation outside the shielding box can be reliably reduced.

In yet another aspect of the present invention, the radiation shielding unit is arranged at a plurality of locations including any one or more of the lower surface of the radiation sensor unit, the top surface of the shielding box, the wall surface of the shielding box, and the inside of the transport unit. In this case, not only the primary scattering but also the effect of comprehensively suppressing secondary and higher-order scattered X-rays is enhanced.

In yet another aspect of the present invention, a shielding curtain is further provided on the entrance side and the exit side of the shielding box. In this case, leakage of radiation outside the shielding box can be further reliably reduced.

In yet another aspect of the present invention, the radiation emitted from the radiation source is X-rays, and the radiation shielding portion is formed of lead.

In order to achieve the above object, one aspect of the baggage inspection apparatus according to the present invention includes the above-described radiation inspection apparatus and inspects baggage as an inspection object.

In the above baggage inspection apparatus, radiation leakage to the surroundings can be reduced by the radiation shielding part, and a sense of security for the baggage inspection apparatus can be enhanced.

1 is a side view conceptually showing an X-ray inspection apparatus or a baggage inspection apparatus according to a first embodiment. It is AA arrow sectional drawing of FIG. It is BB arrow sectional drawing of FIG. 2A. It is CC arrow sectional drawing of FIG. It is the expanded sectional view which looked at the radiation sensor part along the longitudinal direction. It is the expanded side view which looked at the sensor part along the transversal direction. It is a key map explaining backscattering of X-rays. It is a conceptual diagram explaining the backscattering intensity | strength of X-ray | X_line. It is an expanded sectional view explaining the principal part of the X-ray inspection apparatus or baggage inspection apparatus which concerns on 2nd Embodiment. It is an expanded sectional view explaining the modification of the principal part of a X-ray inspection apparatus. It is an expanded sectional view explaining another modification of the principal part of a X-ray inspection apparatus. It is sectional drawing explaining the X-ray inspection apparatus etc. which concern on 3rd Embodiment.

[First Embodiment]
Hereinafter, a radiation inspection apparatus and a baggage inspection apparatus according to a first embodiment of the present invention will be described with reference to the drawings.

An X-ray inspection apparatus 50 shown in FIG. 1 includes a belt conveyor 51 as a conveyance unit, an inspection main body 52 for confirming the contents of an object to be inspected TO conveyed by the belt conveyor 51 by X-ray irradiation, and a belt conveyor. 51, a detection unit 53 for detecting the presence of an object to be inspected conveyed to the inspection main body 52, a display device 54 for displaying an X-ray transmission image of the inspection object TO, a control unit 56 for controlling each part, A radiological examination apparatus comprising: Specifically, the X-ray inspection apparatus 50 can inspect the baggage BA as the inspection object TO and functions as the baggage inspection apparatus 100.

The X-ray inspection apparatus (radiation inspection apparatus) 50 detects the inspection object TO by the detection unit 53 that is a camera or the like provided on the entrance side of the inspection main body 52, and conveys the inspection object TO by the belt conveyor 51. The inspection main body 52 is transported so as to be fed into the inspection main body 52, and the inspection main body 52 performs inspection to visualize the internal structure by X-ray irradiation, and the inspection object TO is carried out of the inspection main body 52 and inspected. finish.

In the X-ray inspection apparatus 50, as shown in FIGS. 2A to 2C, a belt conveyor 51 serving as a transport unit includes a belt part 51a on which an object TO is placed and both ends on the inlet side and the outlet side of the apparatus. And a pair of

roller portions

51b and 51b to which the belt portion 51a is attached and a belt portion between the pair of

roller portions

51b and 51b in the transport direction D1 and in the ring-shaped belt portion 51a. The belt support part 51c which is a plate-shaped part which supports the to-be-inspected object TO mounted on 51a and the belt part 51a, and the support frame 51d which supports said each part are provided.

The

roller parts

51b and 51b are driven and rotated by a mechanism (not shown) to move the upper part of the belt part 51a together with the inspection object TO in the transport direction D1 at an expected speed.

The belt support 51c is arranged on the plurality of elongated plate-

like block members

62, 62... And the pressers arranged on the plurality of

block members

62, 62. It is comprised with the board 61. FIG. Each block-like member 62 is spanned between a pair of

flange portions

65, 65 extending from the support frame 51d, and is detachably fixed. Among the plurality of block-shaped

members

62, 62..., Those arranged in the shielding box 75 are made of lead or the like, have X-ray absorption, and partially generate X-rays generated in the inspection main body 52. Shield. Here, the plurality of block-

like members

62, 62... Are arranged avoiding the transmission region SL that transmits X-rays. That is, the plurality of block-shaped

members

62, 62... Absorb the part of the X-rays generated in the inspection main body 52 and transmit the other part of the X-rays in the transmission region SL, thereby X-ray irradiation can be performed on the inspection object TO passing through. The presser plate 61 is a plate-like member made of an X-ray transparent material such as acrylic. The presser plate 61 constitutes the uppermost surface of the belt support portion 51c and suppresses the occurrence of rattling on the upper surface of the belt support portion 51c to ensure the support of the belt portion 51a by the belt support portion 51c. Further, the presser plate 61 has not only a flat upper surface but also less friction, and ensures stable and reliable conveyance of the inspection object TO placed on the belt portion 51a together with the belt portion 51a. ing. A support frame 51 d that supports the belt portion 51 a and the like is covered with a cover portion 77.

The inspection main body 52 has passed the inspection object TO among the X-ray source 71 that irradiates the X-ray RL that is radiation to the inspection object TO that is the inspection object, and the X-ray RL from the X-ray source 71. An X-ray sensor unit 72 that receives components, and a rectangular parallelepiped shielding box 75 that houses the X-ray source 71 and the X-ray sensor unit 72 therein. Here, the belt conveyor 51 serving as a transport unit extends between the X-ray source 71 and the X-ray sensor unit 72 in the y direction intersecting with the longitudinal direction of the X-ray sensor unit 72 and the entrance EN of the shielding box 75. And the exit EX. Thus, the inspection can be performed while the inspection object TO is passed between the X-ray source 71 and the X-ray sensor unit 72 in the shielding box 75 by the belt conveyor 51.

The X-ray source 71 is a radiation source that emits an X-ray RL. The X-ray source (radiation source) 71 is disposed on the lower side near the center of the shielding box 75 and irradiates the X-ray sensor RL with X-rays RL as radiation from the emission unit EA. In this embodiment, a pulse oscillation type cold cathode X-ray source is incorporated as the X-ray source 71, but it can be replaced with a CW oscillation type hot cathode X-ray source. A shield 71b that suppresses the spread of the X-ray RL in the transport direction D1 or the x direction is disposed above the shield container 71a of the X-ray source 71 and below the belt conveyor 51.

The X-ray sensor unit 72 is a radiation sensor unit that receives the X-ray RL. The X-ray sensor unit 72 is disposed on the upper side near the center of the shielding box 75 so as to face the X-ray source 71 with the belt conveyor (conveying unit) 51 interposed therebetween. For example, the X-ray sensor unit 72 arranges the light receiving elements in a line so as to extend in a direction perpendicular to the conveyance direction D1, thereby enabling line-type scanning in cooperation with conveyance by the belt conveyor 51. ing. That is, when the inspection object TO passes through the region DD near the center of the shielding box 75, the inspection object is irradiated with X-rays, and based on the result received by the X-ray sensor unit 72, 3 inside the baggage BA. A dimensional inspection is made.

The shielding box 75 is a rectangular parallelepiped housing, and has a rectangular opening that inserts the belt conveyor 51 to convey the object TO be inspected and forms an inlet EN and an outlet EX of the object TO. is doing. In addition, each wall part which comprises the shielding box 75 is formed with X-ray absorption members, such as lead, in order to suppress the X-ray leakage to the exterior. Shielding curtains CN1 and CN2 are provided at the entrance EN and the exit EX of the shielding box 75. As the material of the shielding curtains CN1 and CN2, a material in which strip-like lead-containing rubber-like members are arranged can be used. By providing the shielding curtains CN1 and CN2, leakage of X-rays outside the shielding box 75 can be more reliably reduced.

As shown in FIG. 3A, the X-ray sensor unit 72 includes a light receiving element 72a, a signal processing circuit 72b, and a storage container 72c. The detection surface 72j of the light receiving element 72a extends in a straight line in the x direction perpendicular to the paper surface, and has a long and narrow rectangular shape with the x direction as the longitudinal direction. Specifically, the detection surface 72j has a length about the width of the belt portion 51a of the belt conveyor 51 shown in FIG. 2A and the like, and has a width of about several mm in the y direction, for example. The storage container 72c is formed of an X-ray absorbing member such as lead, and has an opening 72o in a range corresponding to the detection surface 72j of the light receiving element 72a and a transmission window 72w that closes the opening 72o.

As shown in FIGS. 3A and 3B, a radiation shielding unit 82 is provided on the lower surface 72 u side of the X-ray sensor unit 72 in association with the X-ray sensor unit 72. That is, the radiation shielding unit 82 and the X-ray sensor unit 72 are arranged at different height positions in the vertical direction, that is, the z direction. The radiation shielding part 82 is formed of an X-ray absorbing member such as lead in order to shield the X-ray RL that is the radiation scattered by the X-ray sensor part 72. The radiation shielding part 82 has a pair of strip-like

flat plate members

82a and 82b, and both the

flat plate members

82a and 82b are in the irradiation region DR where X-rays RL as radiation from the X-ray source 71 are directly incident. It extends so as to sandwich the irradiation region DR outside. More specifically, the pair of

flat members

82a and 82b extend outside the detection surface 72j of the X-ray sensor unit 72 so as to face each other along the longitudinal direction of the detection surface 72j. Thereby, the spread of the scattered radiation emitted in the y direction orthogonal to the longitudinal direction of the detection surface 72j that is a line sensor can be limited. That is, by appropriately adjusting the shape and arrangement of the pair of

flat plate members

82a and 82b, the maximum inclination angle of the primary scattered radiation can be set to a desired value, and the arrival region of the primary scattered X-rays L12 and L22. Can be limited. The pair of

flat plate members

82a and 82b are vertically downward from a base portion 72q of a storage container 72c provided outside a pair of sides S1 and S2 extending in the longitudinal direction of the detection surface 72j of the X-ray sensor portion 72. While projecting, it extends parallel to the x direction, which is the longitudinal direction of the detection surface 72j. As shown in FIG. 3B, the width or length in the longitudinal direction or the x direction of the pair of

flat plate members

82a and 82b is longer than the length in the x direction of the detection surface 72j of the X-ray sensor unit 72, and the range of the detection surface 72j. It is intended to cover.

Hereinafter, the vertical width and the horizontal interval of the

flat members

82a and 82b will be described. Out of the X-rays RL that enter the outside of the transmission window 72w of the X-ray sensor unit 72, the outer X-rays L11 and L21 that enter the outermost points P1 and P2 with reference to the transmission window 72w are the outermost points P1 and P2. Are scattered back into the shielding box 75 as primary scattered X-rays L12 and L22. At this time, the primary scattered X-rays L12 and L22 are limited in the inclination angle of backscattering due to the arrangement of the opposite

flat plate members

82a and 82b, particularly the arrangement of the lower end portion 82e. Specifically, assuming that the distance from the outermost point P1 to the opposite flat plate member 82b is d and the vertical width of the flat plate member 82b is h, the maximum inclination angle θ1 of the primary scattered X-ray L12 is the lower end portion 82e. Shielding at becomes a critical point and becomes tan ⁻¹ (d / h). The backscattering component L13 having an inclination angle larger than the maximum inclination angle θ1 becomes secondary scattered X-rays that are backscattered again on the inner surface of the flat plate member 82b, and therefore, compared with the intensity or frequency of the original X-ray RL. (1 / 100-1 / ¹⁰⁰⁰⁾ become a thing about ^twice a minute, the degree of influence on safety is easy to secure the peace of mind falling dramatically. When the outer X-ray L11 incident on the outermost point P1 is back-scattered and incident on the flat plate member 82a on the same side, this back-scattered component L14 becomes secondary scattered X-ray, which is given to safety. The degree of influence drops dramatically. The same applies to the primary scattered X-ray L22 caused by the outer X-ray L21 incident on the opposite outermost point P2, and the distance from the outermost point P2 to the opposite flat plate member 82a is d, and the flat plate member 82b When the vertical width is h, the maximum inclination angle θ2 is tan ⁻¹ (d / h). The angle region A1 within the maximum inclination angles θ1 and θ2 described above is an arrival region of the primary scattered X-rays L12 and L22, and preferably does not have a spread that directly leaks out of the shielding box 75. On the other hand, in the angle region A2 outside the maximum inclination angles θ1 and θ2, the primary scattered X-rays L12 and L22 are blocked by the plate-

like members

82a and 82b, and the intensity or frequency of X-rays is extremely reduced. Since the propagation distance of the line becomes long, it does not matter if it has any extent in the shielding box 75. Actually, as shown in FIG. 2B, the maximum spreading positions M1, M2 of the lower end of the angle region A1 are set to be inside the entrance EN and the exit EX of the shielding box 75, and the

flat plate members

82a, 82b prevents the primary scattered X-rays L12 and L22 from directly entering the entrance EN and the exit EX. As a result, X-ray leakage outside the shielding box 75 can be reliably reduced. Even if the primary scattered X-rays L12 and L22 that have passed through the angle region A1 are incident on the belt conveyor 51, they become secondary scattered X-rays, and the propagation distance becomes longer, and the amount of leakage can be suppressed. The vertical width h of the plate-

like members

82a and 82b is desirably secured to some extent from the viewpoint of restricting the angle region A1 to be narrow, but needs to be in a range that does not hinder the conveyance path of the belt conveyor 51. From the viewpoint of reducing the vertical width h of the

flat members

82a and 82b, it can be said that the

flat members

82a and 82b are preferably as close as possible to the outer X-rays L11 and L21.

In the above description, the description has been made on the assumption that the outer X-rays L11 and L21 are incident on the X-ray sensor unit 72 symmetrically, but the outer X-rays L11 and L21 are incident on the X-ray sensor unit 72 asymmetrically. For the individual outer X-rays L11 and L21, the maximum inclination angles θ1 and θ2 may be evaluated to set the arrangement and size of the

flat plate members

82a and 82b. In this case, the two

flat members

82a and 82b may have different heights or vertical widths. Furthermore, in the above description, the X-ray sensor unit 72 is in the center in the shielding box 75 with respect to the transport direction D1, but the X-ray sensor unit 72 is also in a position deviated from the center in the shielding box 75. The arrangement and size of the

flat members

82a and 82b are individually set according to the incident positions of the outer X-rays L11 and L21. Further, the height or vertical width of the

flat members

82a and 82b is constant regardless of the position in the x direction, but is not limited thereto, and may be different depending on the position in the longitudinal x direction. Good.

FIG. 4A is a diagram for explaining scattering of X-ray RL. When the X-ray RL is incident on the object OB, if the object OB is a scatterer, a forward scattering component DR1 and a backscattering component DR2 are generated in addition to the transmission component R1. Although depending on the thickness and shielding ability of the object OB, the ratio of the forward scattering component DR1 and the back scattering component DR2 is smaller than the transmission component R1, and generally the forward scattering component DR1 is more than the back scattering component DR2. Will also increase. Further, as shown in FIG. 4B, for the backscattering component DR2, the scattering intensity increases as the scattering angle φr increases. When considering the primary scattered X-rays L12 and L22 as shown in FIG. 3A, these correspond to the backscattered component DR2, and the intensity or frequency of the primary scattered X-rays L12 and L22 depends on the object OB and the scattering. Although depending on the angle φr, the level is, for example, 1/100 times or less of the intensity or frequency of the original X-ray RL.

As described above, in the X-ray inspection apparatus 50 according to the first embodiment, the radiation shielding unit 82 shields the X-rays scattered by the X-ray sensor unit 72, that is, the primary scattered X-rays L12 and L22. Leakage of X-rays to the periphery of the X-ray sensor unit 72 due to the sensor unit 72 can be reduced, and a sense of security for the X-ray inspection apparatus 50 can be enhanced.

[Second Embodiment]
Hereinafter, a second embodiment obtained by modifying the first embodiment will be described with reference to FIG. 5A. Note that the X-ray inspection apparatus 50 according to the present embodiment has the same configuration as that of the first embodiment except for the radiation shielding part 82 and the surrounding structure, and therefore the detailed description of the X-ray inspection apparatus 50 as a whole. Is omitted.

In this case, the pair of flat plate-

like members

82a and 82b constituting the radiation shielding portion 82 are inclined with respect to the vertical direction and are narrowed on the tip side. In the case of the second embodiment, similarly to the case of the first embodiment, the maximum inclination angle θ1, the primary scattered X-rays L12, L22 is adjusted by adjusting the arrangement of the lower end portions 82e of the

flat plate members

82a, 82b. θ2 can be set to a desired value, and the angle region A1 can be set to have a desired spread. By making the pair of

flat members

82a and 82b into a shape or arrangement that narrows on the tip side, it becomes relatively easy to bring the

flat members

82a and 82b closer to the outer X-rays L11 and L21.

FIG. 5B is a modification of the radiation shielding part 82 shown in FIG. 5A, and the

flat plate members

82a and 82b have a curved shape. FIG. 5C is a further modification of the radiation shielding part 82 shown in FIG. 5A, and the plate-

like members

182a and 182b constituting the radiation shielding part 82 are L-shaped in section and are a combination of two flat plate members. ing.

[Third Embodiment]
Hereinafter, the third embodiment will be described with reference to FIG. Note that the X-ray inspection apparatus 50 according to the present embodiment is a partial modification of the first embodiment, and description of overlapping portions is omitted.

The X-ray inspection apparatus 50 has radiation shielding portions 82 arranged at a plurality of locations in the shielding box 75. Specifically, in the shielding box 75, a pair of additional

flat members

182 a and 182 b extending from the lower surface 72 u of the X-ray sensor unit 72 and the shielding box 75 are disposed outside the basic

flat members

82 a and 82 b. A pair of additional

flat plate members

282a and 282b extending from the top surface 75a are formed. The additional

flat members

182 a, 182 b, 282 a, and 282 b have similar shapes but different dimensions from the basic

flat members

82 a and 82 b, and are primary or scattered by the X-ray sensor unit 72. It has a role of shielding higher-order and higher-order scattering components. A pair of additional

flat plate members

382a and 382b are formed from the wall surface 75b of the shielding box 75 so as to be spanned in the x direction above the transport path. The pair of

flat members

382a and 382b have a role of shielding secondary and higher order scattering components from the X-ray sensor unit 72 and a role of shielding primary and higher order scattering components from the object TO. . Further, a space is provided in the transmission region SL in the belt support portion 51c of the belt conveyor 51, and a pair of additional

flat plate members

482a and 482b are provided so as to sandwich the space in the conveyance path direction. The pair of

flat members

482a and 482b have a role of shielding primary and higher-order scattering components from the X-ray sensor unit 72 and the inspection object TO inside the belt conveyor (conveying unit) 51.

[Others]
The present invention is not limited to the above embodiments, and can be implemented in various modes without departing from the scope of the invention.

In the above embodiment, the X-ray RL is used for the fluoroscopic observation type inspection, but radiation other than the X-ray RL can be used.

In the above-described embodiment, the case where the X-ray inspection apparatus 50 is applied to the baggage inspection apparatus 100 has been described. However, the X-ray inspection apparatus 50 is not limited to the baggage inspection, and inspects various objects with X-rays or other radiation. It can be applied to.

The shape of the detection surface 72j of the X-ray sensor unit 72 is not limited to the illustrated example, and the aspect ratio can be variously changed.

When the incident amount of X-rays to the shielding curtains CN1 and CN2 is small at the entrance EN or the exit EX of the shielding box 75, the shielding curtains CN1 and CN2 can be omitted.

In the above embodiment, the belt conveyor (conveying unit) 51 is used. However, in the X-ray inspection apparatus 50 that does not have the belt conveyor 51, the radiation shielding unit 82 shown in FIG. 3A or the like can be assembled. When the belt conveyor 51 is not provided, the X-ray sensor unit 72 can be irradiated in a planar shape without using the X-ray sensor unit 72 as a line sensor type. One of the line sensor units 72 may be moved relative to the other.

DESCRIPTION OF SYMBOLS 50 ... X-ray inspection apparatus (radiation inspection apparatus), 51 ... Belt conveyor (conveyance part), 51a ... Belt part, 51b ... Roller part, 51c ... Belt support part, 51d ... Support frame, 52 ... Inspection main-body part, 54 ... Display device 56 ... Control unit 62 ... Block-shaped member 71 ... X-ray source (radiation source) 71a ... Shielding container 72 ... X-ray sensor unit (radiation sensor unit) 72a ... Light receiving element 72c ... Storage container 72j ... detection surface, 72o ... opening, 72q ... base, 72u ... bottom surface, 72w ... transmission window, 75 ... shielding box, 82 ... radiation shielding part, 82a, 82b ... flat plate member, 82e ... lower end, 100 ... baggage Inspection device, A1, A2 ... Angle area, BA ... Baggage, CN1, CN2 ... Shielding curtain, D1 ... Transport direction, DR ... Irradiation area, EA ... Injection unit, EN ... Inlet, EX ... Exit, L11, L21 ... Outside X-ray, L21, L22 ... Primary scattered X-ray L, P1, P2 ... Outermost point, S1, S2 ... A pair of sides, SL ... Transmission region, TO ... Inspected object, θ1, θ2 ... Maximum inclination angle

Claims

A radiation source for irradiating the object with radiation;
A radiation sensor unit that receives radiation from the radiation source;
A radiation shielding part that extends outside an irradiation region where radiation is directly incident on the radiation sensor part side and shields radiation scattered by the radiation sensor part; and
A radiation inspection apparatus.
The detection surface of the radiation sensor unit extends linearly in a predetermined direction,
The radiation shielding part extends in a state of facing the longitudinal direction of the detection surface outside the detection surface of the radiation sensor unit.
The radiation inspection apparatus according to claim 1.
The radiation source and the radiation sensor unit are arranged at different height positions in the vertical direction,
A shielding box that houses the radiation source and the radiation sensor unit and shields radiation; and an entrance of the shielding box that extends between the radiation source and the radiation sensor unit in a direction intersecting the predetermined direction. And a transport section extending between the outlet and the outlet,
The radiation inspection apparatus according to claim 2.
The radiation shielding portion is a strip shape that protrudes vertically downward from a base portion provided outside the pair of sides extending in the longitudinal direction of the detection surface of the radiation sensor portion and extends in parallel with the longitudinal direction of the detection surface. The radiation inspection apparatus according to claim 3, which is a pair of flat plate members.
The predetermined width of the pair of flat plate members is set so as to prevent radiation scattered by the radiation sensor unit from directly entering the entrance and the exit of the shielding box. The radiation inspection apparatus described.
The said radiation shielding part is arrange | positioned in several places including any one or more of the lower surface of the said radiation sensor part, the top | upper surface of the said shielding box, the wall surface of the said shielding box, and the inside of the said conveyance part. Radiation inspection equipment.
The radiation inspection apparatus according to claim 3, further comprising shielding curtains provided on an entrance side and an exit side of the shielding box.
The radiation inspection apparatus according to claim 1, wherein the radiation irradiated by the radiation source is X-rays, and the radiation shielding part is formed of lead.
A baggage inspection apparatus comprising the radiation inspection apparatus according to any one of claims 1 to 8 and inspecting baggage as an object to be inspected.