Ray attenuation equipment and radioactive substance detection system

Abstract

The present disclosure provides a ray attenuation device, comprising: a transmission device comprising: a housing; the collimation channel is formed in the shell and comprises an input port suitable for receiving rays and an output port suitable for leading out the rays; the absorption sheet is made of a ray shielding material and is arranged outside the output port; and the driving device is configured to drive the absorption sheet to move relative to the output port of the transmission device, so that the absorption sheet moves between a shielding position for shielding rays from the output port and a staggered position for completely leaving the output port. The invention further provides a radioactive substance detection system which comprises the ray attenuation equipment, and the waste bin capable of emitting rays is arranged near the input port of the collimation channel; the detection end face of the detector faces the output port of the collimation channel so as to detect the dose of the rays emitted from the output port. The absorption sheet is used for absorbing a part of rays at the shielding position, so that the dose of the rays penetrating through the absorption sheet is reduced.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to a radioactive material inspection system, and more particularly to a ray attenuation device and a radioactive material detection system. Background Art

[0002] Currently, for the treatment of radioactive waste, the waste needs to be placed in a waste barrel, and then the radiation radiated by the waste barrel is detected by a detector to conduct qualitative and / or quantitative detection of the radioactive substances contained in the waste for classification and disposal.

[0003] During the detection process using the detector, if the intensity of the radiation emitted by the waste is too high, it may cause damage to the detector, thereby reducing the service life of the detector. Summary of the invention

[0004] To solve at least one of the above and other technical problems in the prior art, the present disclosure provides a ray attenuation device and a radioactive material detection system. The driving device is suitable for driving the absorption sheet to move relative to the transmission device to shield at least a portion of the rays emitted from the output port.

[0005] One aspect of the present disclosure provides a ray attenuation device, comprising: a transmission device, comprising: a housing; a collimation channel formed in the housing, comprising an input port suitable for receiving rays and an output port suitable for leading out the rays; an absorption sheet made of a ray shielding material and arranged outside the output port; and a driving device, configured to drive the absorption sheet to move relative to the output port of the transmission device, so that the absorption sheet moves between a shielding position that at least partially shields rays from the output port and a staggered position that completely leaves the output port.

[0006] According to an embodiment of the present disclosure, a base is further included, and at least one of the transmission device, the absorption sheet and the driving device is installed on the base.

[0007] According to an embodiment of the present disclosure, the driving device includes: a plurality of support frames installed on the base; a first motor installed on the base or the support frame; a lead screw rotatably installed on the support frame and rotated under the drive of the first motor; a connecting arm, one end of the connecting arm being threadedly engaged with the lead screw, and the absorption sheet being installed on the other end of the connecting arm, so that the rotation of the lead screw drives the absorption sheet to move linearly through the connecting arm.

[0008] According to an embodiment of the present disclosure, a stroke limiting device is further included, configured to limit the moving range of the absorption sheet.

[0009] According to an embodiment of the present disclosure, the stroke limiting device includes: a first position sensor and a second position sensor, and the driving device is suitable for stopping driving the absorption sheet to move further when the first position sensor and the second position sensor detect that the absorption sheet reaches the shielding position and the staggered position, so as to limit the movement of the absorption sheet between the shielding position and the staggered position.

[0010] According to an embodiment of the present disclosure, the absorption sheet includes at least two different thicknesses so as to absorb rays to different degrees when shielding the output port.

[0011] According to an embodiment of the present disclosure, the absorbent sheet is formed in one piece or is formed by stacking a plurality of sub-absorbent sheets.

[0012] According to an embodiment of the present disclosure, the cross-sectional area of ​​the collimating channel of the transmission device is configured to be adjustable to allow different doses of radiation to be transmitted in the collimating channel.

[0013] According to an embodiment of the present disclosure, the transmission device includes a plurality of baffles disposed in the housing, and the baffles surround at least a portion of the collimating channel.

[0014] According to an embodiment of the present disclosure, the transmission device further comprises an adjustment component, wherein the adjustment component is connected to at least one of the baffles to drive the baffle to move between a gathering position for reducing the cross-sectional area of ​​the collimating channel and a dispersion position for expanding the cross-sectional area.

[0015] According to an embodiment of the present disclosure, the adjustment assembly is configured to drive the two baffles to move closer to each other or away from each other.

[0016] According to an embodiment of the present disclosure, the adjustment assembly includes: two first adjustment parts, which are symmetrically arranged in the outer shell and slidably cooperate with the outer shell, and the two first adjustment parts are arranged to be able to move closer to and away from each other; and two second adjustment parts, each of which is telescopically installed in one of the first adjustment parts, and each of the second adjustment parts and the first end facing the other second adjustment part are respectively installed with two baffles, and a first angle is formed between the two baffles.

[0017] According to an embodiment of the present disclosure, each of the first adjustment parts includes: a slider slidably installed in the outer shell; a first driving member installed on the outer shell, the first driving member drives the slider to move between a first position and a second position, a groove is formed at the inner end of the slider, and the two grooves cooperate with the four baffles to enclose the collimation channel.

[0018] According to an embodiment of the present disclosure, a guide groove is formed in the slider, including: a main groove formed in the slider and extending along the sliding direction of the slider; and two auxiliary grooves symmetrically formed at the inner end of the main groove, forming a second angle between the two auxiliary grooves.

[0019] According to an embodiment of the present disclosure, each of the second adjusting parts comprises: a moving rod, comprising: a main rod, slidably installed in the main groove; two auxiliary rods, formed at the inner end of the main rod close to the auxiliary groove, and a third angle is formed between the two auxiliary rods; and a second driving member, installed on the sliding block, and the second driving member drives the main rod to move along the main groove; wherein each of the auxiliary rods is pivotally mounted with a baffle at the end away from the main rod, the first end of the baffle is located in the auxiliary groove, and the second end of the baffle extends out of the auxiliary groove.

[0020] According to an embodiment of the present disclosure, the adjustment assembly further includes two shielding parts, which are respectively opened and closed on the outside of the collimation channel to shield at least a portion of the rays leaking from the gaps formed between adjacent baffles.

[0021] According to an embodiment of the present disclosure, each of the shielding parts includes: two shielding plates, each of which is slidably mounted on the first adjustment part; and a third driving member mounted on the first adjustment part, the third driving member driving the shielding plate to move between a third position and a fourth position.

[0022] Another aspect of the present disclosure also provides a radioactive material detection system, comprising: a radiation attenuation device, a waste bucket capable of emitting radiation, arranged near the input port of the collimation channel; and a detector, the detection end of the detector faces the output port of the collimation channel to detect the radiation dose emitted from the output port.

[0023] In the ray attenuation device according to the above-mentioned embodiment of the present disclosure, the transmission device is suitable for defining a collimation channel, and the driving device is suitable for driving the absorption plate to move relative to the transmission device to absorb a portion of the rays output by the transmission device when the absorption plate is in a shielding position, so that the dose of the rays passing through the absorption plate is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional schematic diagram of a ray attenuation device according to an exemplary embodiment of the present disclosure;

[0025] Figure 2 yes Figure 1 a side view of the illustrated exemplary embodiment;

[0026] Figure 3is a partial cross-sectional view of a portion of a transmission device according to an exemplary embodiment of the present disclosure;

[0027] Figure 4 yes Figure 3 A partial enlarged view of part A in the exemplary embodiment shown;

[0028] Figure 5 yes Figure 3 An exploded view of a portion of a transmission device in the illustrated exemplary embodiment; and

[0029] Figure 6 is a top view of a radioactive material detection system according to an illustrative embodiment of the present disclosure.

[0030] Reference numerals

[0031] 1. Base;

[0032] 2. Driving device;

[0033] 21. The first motor;

[0034] 22. Screw;

[0035] 23. Connecting arm;

[0036] 24. Support frame;

[0037] 3. Stroke limiting device

[0038] 31. A first position sensor;

[0039] 32. A second position sensor;

[0040] 4. Absorption sheet group;

[0041] 5. Adjustment components;

[0042] 51. Shell;

[0043] 52. Shielding part;

[0044] 521, shielding plate;

[0045] 522, third driving member;

[0046] 53. Second adjustment unit;

[0047] 531, second driving member;

[0048] 532, mobile pole;

[0049] 5321, main pole;

[0050] 5322, auxiliary rod;

[0051] 533, baffle;

[0052] 54. A first regulating unit;

[0053] 541, first driving member;

[0054] 542, slider;

[0055] 543, main slot;

[0056] 544, auxiliary slot;

[0057] 55. Collimation channel;

[0058] 56. Groove;

[0059] 6. Detectors; and

[0060] 7. Waste bin. DETAILED DESCRIPTION

[0061] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0062] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0063] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0064] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0065] Figure 1 is a three-dimensional schematic diagram of a ray attenuation device according to an exemplary embodiment of the present disclosure. Figure 2 yes Figure 1 A side view of the exemplary embodiment shown.

[0066] The present disclosure provides a ray attenuation device, such as Figure 1 and Figure 2 As shown, it includes a transmission device 5, an absorption sheet 4 and a driving device 2. The transmission device 5 includes a housing 51 and a collimation channel 55 formed in the housing 51, and the collimation channel 55 includes an input port suitable for receiving radiation and an output port suitable for extracting radiation. The absorption sheet 4 is made of radiation shielding material and is arranged outside the output port. The driving device 2 is configured to drive the absorption sheet 4 to move relative to the output port of the transmission device 5, so that the absorption sheet 4 moves between a shielding position that at least partially shields the radiation from the output port and a staggered position that completely leaves the output port.

[0067] In such an embodiment, the transmission device is suitable for defining a collimation channel, and the driving device is suitable for driving the absorption plate to move relative to the transmission device, so as to absorb a portion of the rays output by the transmission device when the absorption plate is in a shielding position, so that the dose of the rays passing through the absorption plate is reduced, thereby avoiding damage to the radiation detector when detecting radiation with a large radiation dose, thereby increasing the service life of the detector.

[0068] In an illustrative embodiment, the position of the transmission device is fixed at a suitable installation position (for example, in front of a waste bin to be detected), and the absorbent sheet 4 is movably installed in a side area of ​​the transmission position 5, for example, between the detector and the output port of the transmission device 5. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0069] For example, the absorbent sheet 4 may be fixed at a position facing the waste bin, and the transmission device may be movably disposed between the absorbent sheet 4 and the waste bin.

[0070] According to the embodiments of the present disclosure, Figure 1 and Figure 2 As shown, the ray attenuation device further includes a base 1. At least one of the transmission device 5, the absorption sheet 4 and the driving device 2 is mounted on the base 1. In this way, a suitable combination can be selected according to different working scenarios to achieve the purpose of simplifying the installation method or saving space.

[0071] In an illustrative embodiment, the transmission device 5 and the absorption sheet 4 are both mounted on the base 1. In this way, the radiation attenuation device can be preassembled so that the radiation attenuation device can be put into the work of detecting radiation dose more quickly.

[0072] In another exemplary embodiment, the transmission device 5, the absorption sheet 4 and the driving device 2 can be selectively installed on the base 1. Such an embodiment can move the above devices separately, which is conducive to the transportation of the radiation attenuation device.

[0073] According to the embodiments of the present disclosure, Figure 1 and Figure 2 As shown, the driving device 2 includes a plurality of support frames 24, a first motor 21, a lead screw 22 and a connecting arm 23. The plurality of support frames 24 are mounted on the base 1. The first motor 21 is mounted on the first motor of the support frame 24. The lead screw 22 is rotatably mounted on the support frame 24 and driven by the first motor 22. One end of the connecting arm 23 (such as Figure 1 The lower end shown in FIG. 2 is threadedly connected to the lead screw 22, and the absorbent sheet 4 is installed at the other end of the connecting arm 23 (as shown in FIG. Figure 1 The upper end shown in the figure) causes the rotation of the lead screw 22 to drive the absorption sheet 4 to move linearly through the connecting arm 23.

[0074] In an illustrative embodiment, Figure 2 As shown, the ray attenuation device includes two support frames 24. Specifically, the two support frames 24 are arranged at both ends of the base 1 (such as Figure 2 The lead screw 22 is rotatably mounted between the two support frames 24. Further, the lead screw 22 is rotated along the Figure 2 As shown, the screw 22 is extended in the horizontal direction, the outer part of the screw 22 is threadedly connected with the lower part of the connecting arm 23, and the upper part of the connecting arm 23 is integrally fixed with an absorption sheet 4.

[0075] According to an embodiment of the present disclosure, the ray attenuation device further comprises a stroke limiting device 3. The stroke limiting device 3 is configured to limit the moving range of the absorption sheet 4 so that the absorption sheet 4 moves between the shielding position and the staggered position.

[0076] In an illustrative embodiment, the stroke limiting device 3 includes, but is not limited to, a component for detecting the absolute position of the absorption sheet 4 and / or a component for detecting the relative displacement of the absorption sheet 4 .

[0077] For example, the stroke limiting device 3 adopts a contact switch. When the absorption sheet 4 moves to a position in contact with the contact switch, a corresponding signal is sent to stop the absorption sheet 4 at the above position.

[0078] For another example, the stroke limiting device 3 uses a displacement sensor. When the absorbing sheet 4 moves beyond a preset displacement and is detected by the displacement sensor, a corresponding signal is sent to stop the absorbing sheet 4 at the above position.

[0079] According to an embodiment of the present disclosure, the stroke limiting device 3 includes a first position sensor 31 and a second position sensor 32 .

[0080] In such an embodiment, the driving device 2 is suitable for stopping driving the absorption sheet 4 to move further when the first position sensor 31 and the second position sensor 32 detect that the absorption sheet 4 reaches the shielding position and the staggered position. That is, when the absorption sheet 4 reaches the shielding position or the staggered position, it will no longer continue to move further, but is allowed to move in the opposite direction to the previous direction to limit the movement of the absorption sheet 4 between the shielding position and the staggered position.

[0081] In an illustrative embodiment, the first position sensor 31 and the second position sensor 32 are electrically connected to a programmable logic controller (PLC) after being connected to a normally open contact, and the PLC is also electrically connected to the first motor 21. Further, when the ray attenuation device is not working, the absorption sheet group is in the initial state, and the travel limiting device 3 is not triggered; when the ray attenuation device is working, the PLC calculates the corresponding step value according to the width of each sub-absorption sheet, and drives the first motor 21 (using a servo motor) through the servo amplifier to make the absorption sheet 4 move to a specified position until the work is completed or any position sensor is triggered. After any position sensor is triggered, the PLC controls the servo motor to stop until the next work.

[0082] According to an embodiment of the present disclosure, the absorption sheet 4 includes at least two different thicknesses so as to have different degrees of absorption of radiation when shielding the output port.

[0083] According to the embodiments of the present disclosure, Figures 3 to 5 As shown, the absorbent sheet 4 is formed in one piece or is formed by stacking a plurality of sub-absorbent sheets.

[0084] In an exemplary embodiment, the absorbent sheet 4 includes four different thicknesses, and the four absorbent sheets 4 are arranged side by side in the horizontal direction to form a row. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0085] For example, the absorber 4 may use three, five, six or other sub-absorbers of different thicknesses. The specific thickness of the sub-absorber should be designed according to the radiation to be detected.

[0086] For example, four sub-absorbent sheets of different thicknesses can be arranged in a vertical direction to form a column, or to form a square array. The arrangement of the sub-absorbent sheets should correspond to the moving direction of the absorbent sheet.

[0087] In such an embodiment, through the configured driving device 2, the stroke limiting device 3 and the absorption sheet 4 with different numbers of stacked sub-absorption sheets, the position of the absorption sheet 4 relative to the output port of the collimation channel can be independently controlled, so that the thickness of the configured absorption sheet 4 can be adjusted in response to the intensity of the rays, so that the intensity of the shielded rays meets the detection requirements of the external detector, avoiding damage to the detector.

[0088] Figure 3 is a partial cross-sectional view of a portion of a transmission device according to an exemplary embodiment of the present disclosure. Figure 4 yes Figure 3 A partial enlarged view of part A in the exemplary embodiment shown. Figure 5 yes Figure 3 An exploded view of a portion of a transport device in an exemplary embodiment is shown.

[0089] According to the embodiments of the present disclosure, Figures 3 to 5 As shown, the cross-sectional area of ​​the collimating channel 55 of the transmission device 5 is configured to be adjustable to allow different doses of radiation to be transmitted in the collimating channel 55 .

[0090] In such an embodiment, by adjusting the cross-section of the collimation channel 55, the size of the collimation hole (i.e., the output port of the collimation channel) of the transmission device 5 can be adjusted to improve the control accuracy of the radiation attenuation device, so as to shield a portion of the radiation and allow the radiation to be radiated only through the collimation channel to the external detector.

[0091] According to the embodiments of the present disclosure, Figures 3 to 5 As shown, the transmission device 5 includes a plurality of baffles 533 disposed in the housing 51 , and the baffles 533 surround at least a portion of the collimating channel 55 .

[0092] In an exemplary embodiment, the baffle 533 is a rectangular straight plate. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0093] For example, the baffle 533 may be an arc-shaped plate, and a plurality of arc-shaped plates are configured to form a cylindrical structure.

[0094] According to the embodiments of the present disclosure, Figures 3 to 5 As shown, the transmission device 5 also includes an adjustment component, which is connected to at least one baffle 533 to drive the baffle 533 to move between a gathering position that reduces the cross-sectional area of ​​the collimating channel 55 and a dispersion position that expands the cross-sectional area.

[0095] According to an embodiment of the present disclosure, the adjustment assembly is configured to drive the two baffles 533 to move closer to or farther away from each other, so as to reduce or expand the cross-sectional area of ​​the collimation channel.

[0096] In an illustrative embodiment, the transmission device 5 includes four baffles 533, wherein two baffles 533 are arranged as a baffle group. Further, each baffle group is driven by an adjustment assembly so that the two baffle groups can be relatively close to or far away from each other. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0097] For example, the baffles 533 include but are not limited to two, three, six or other numbers.

[0098] According to the embodiments of the present disclosure, Figures 3 to 5 As shown, the adjustment assembly includes two first adjustment parts 54 and two second adjustment parts 53. The two first adjustment parts 54 are symmetrically arranged in the housing 51 and slidably cooperate with the housing 51, and the two first adjustment parts 54 are arranged to move closer to and away from each other. The two second adjustment parts 53, one of which is telescopically installed in one first adjustment part 54, and the other is telescopically installed in the other first adjustment part 54. Two baffles 533 are respectively installed at the first end facing each second adjustment part 53, and the two baffles 533 form a first angle α.

[0099] In an exemplary embodiment, the housing 51 includes two detachably mounted half shells, and the two half shells are configured to be spliced ​​into a columnar structure. Specifically, a first adjustment portion 54 is installed in each half shell.

[0100] According to an embodiment of the present disclosure, each of the first adjustment parts 54 includes: a slider 542 slidably mounted in the housing 51, and a first driving member 541 mounted on the housing 51, the first driving member 541 driving the slider 542 to move between the first position and the second position. A groove 56 is formed on the inner side of the slider, and the two grooves 56 cooperate with the four baffles 533 to form a collimation channel 55.

[0101] In an exemplary embodiment, the first driving member 541 includes but is not limited to a second motor. Specifically, the second motor is a servo motor so as to be connected to the private server system for cooperative control.

[0102] According to the embodiments of the present disclosure, Figures 3 to 5 As shown, a guide groove is formed in the slider 542, and the guide groove includes a main groove 543 and two auxiliary grooves 544. The main groove 543 is formed in the slider 542 and extends in a direction parallel to the sliding direction of the slider 542, and the two auxiliary grooves 544 are symmetrically formed at the inner side end of the main groove 543, and a second angle γ is formed between the two auxiliary grooves 544.

[0103] According to the embodiments of the present disclosure, Figures 3 to 5 As shown, the second adjustment portion 53 includes a moving rod 532, which includes a main rod 5321 slidably installed in the main groove 543, two auxiliary rods 5322 formed at the first end of the main rod 5321 near the auxiliary groove 544, and a second driving member 531 installed on the slider 542 and connected to the second end of the main rod 5321, wherein a third angle β is formed between the two auxiliary rods 5322, and a baffle 533 is pivotally mounted on each auxiliary rod 5322, the first end of the baffle 533 is located in the auxiliary groove 544, and the second end of the baffle 533 extends out of the auxiliary groove 544.

[0104] In an illustrative embodiment, the third angle β is smaller than the second angle γ, the width of the main groove 543 is greater than the thickness of the main rod 5321 , and the width of the auxiliary groove 544 is greater than the diameter of the auxiliary rod 5322 .

[0105] In such an embodiment, since the width of the guide groove is greater than the diameters of the main rod 5321 and the auxiliary rod 5322 at the corresponding positions, during the telescopic movement of the main rod 5321, the auxiliary rod 5322 will move synchronously with the main rod 5321 within a certain range in the auxiliary groove 544, so that the outer edge of the auxiliary groove 544 and different positions of the baffle 533 contact each other, and the first angle α of the two baffles 533 connected to the same main rod 5321 changes, thereby adjusting the shape of the collimation channel 55.

[0106] According to the embodiments of the present disclosure, Figures 3 to 5 As shown, the adjustment assembly further includes two shielding parts 52 , which are openably disposed on the outside of the collimating channel 55 to shield at least a portion of the radiation leaking from the gaps formed between adjacent baffles 533 .

[0107] According to an embodiment of the present disclosure, each shielding portion 52 includes two shielding plates 521 slidably mounted on the first adjusting portion 54 on the same side and a third driving member 522 mounted on the first adjusting portion 54 and connected to the shielding plates 521. The third driving member 522 drives the shielding plates 521 to move between the third position and the second position.

[0108] In an illustrative embodiment, the third driving member 522 includes but is not limited to a third motor, and the third motor is a servo motor.

[0109] In such an embodiment, when the two sliders 542 move away from each other, a gap is formed between the baffles 533 provided on the sliders 542, thereby causing a through gap to appear in the collimation channel 55. In the above state, the shielding plate 521 is driven by the third motor so that the two shielding plates 521 are merged to shield the gap between the two baffles 533, which can more effectively limit the radiation from being emitted from the gap to a position outside the shell.

[0110] Combined with the above Figures 3 to 5 The embodiment of adjusting the cross-sectional area of ​​the collimating channel is described, but those skilled in the art will appreciate that the present disclosure is not limited thereto, and other embodiments may be adopted in the case where the cross-sectional area of ​​the collimating channel can be adjusted. For example, a plurality of slits extending along the ray transmission direction are provided in the collimating channel; or two semi-cylinders are provided, and the cross-sectional area of ​​the collimating channel formed by the cylinders is adjusted by adjusting the relative positions of the semi-cylinders.

[0111] Figure 6is a top view of a radioactive material detection system according to an illustrative embodiment of the present disclosure.

[0112] The present disclosure provides a radioactive material detection system, such as Figure 6 As shown, it includes: a radiation attenuation device and a detector 7. A waste bucket 6 is arranged near the input port of the collimation channel 55, and the detection end of the detector 7 faces the output port of the collimation channel 55 to detect the radiation dose emitted from the output port.

[0113] In an illustrative embodiment, the waste bin 6 contains radioactive material, and the radiation attenuation device is used to shield the radiation from the radiation portion of the waste bin, allowing the radiation emitted by the collimation channel 55 to be received by the detection end of the detector 7 .

[0114] According to the radiation attenuation device and radioactive material detection system of the above-mentioned embodiments of the present disclosure, the absorption sheet can be used to absorb a part of the radiation at the shielding position, so that the dose of the radiation passing through the absorption sheet is reduced, and the radiation detector can be prevented from being damaged when detecting radiation with a large radiation dose; the transmission device is used to shield a part of the radiation, so that the unshielded radiation passes through the collimation channel. In this way, the transmission device has the advantages of the radiation attenuation device, and can more effectively reduce the dose of the radiation received by the detector, so as to extend the service life of the detector.

[0115] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0116] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A radiation attenuation device, characterized in that: include: The transmission device (5) comprises: Housing (51); A collimation channel (55) is formed in the housing (51) and includes an input port for receiving radiation and an output port for leading out the radiation; an absorbing sheet (4), made of radiation shielding material, arranged outside the output port; and The driving device (2) is configured to drive the absorption sheet (4) to move relative to the output port of the transmission device (5), so that the absorption sheet (4) moves between a shielding position that at least partially shields the radiation from the output port and a staggered position that completely leaves the output port.

2. The radiation attenuation device according to claim 1, characterized in that: It also comprises a base (1), on which at least one of the transmission device (5), the absorption sheet (4) and the driving device (2) is mounted.

3. The radiation attenuation device according to claim 2, characterized in that: The driving device (2) comprises: A plurality of support frames (24) mounted on the base (1); A first motor (21) mounted on the base or support frame (24); A lead screw (22) is rotatably mounted on the support frame (24) and is driven to rotate by the first motor (21); A connecting arm (23), one end of the connecting arm (23) being threadedly connected to the lead screw (22), and the absorption sheet (4) being mounted on the other end of the connecting arm (23), so that the rotation of the lead screw (22) drives the absorption sheet (4) to move linearly through the connecting arm (23).

4. The radiation attenuation device according to claim 3, characterized in that: It also comprises a stroke limiting device (3) configured to limit the moving range of the absorption sheet (4).

5. The radiation attenuation device according to claim 4, characterized in that: The stroke limiting device (3) comprises: A first position sensor (31) and a second position sensor (32), wherein the driving device (2) is adapted to stop driving the absorption sheet (4) to move further when the first position sensor (31) and the second position sensor (32) detect that the absorption sheet (4) reaches the shielding position and the staggered position, so as to limit the absorption sheet (4) from moving between the shielding position and the staggered position.

6. The radiation attenuation device according to any one of claims 1 to 5, characterized in that: The absorption sheet (4) comprises at least two different thicknesses so as to have different degrees of absorption of radiation when shielding the output port.

7. The radiation attenuation device according to claim 6, characterized in that: The absorbent sheet (4) is formed in one piece or is formed by stacking a plurality of sub-absorbent sheets.

8. The radiation attenuation device according to any one of claims 1 to 5, characterized in that: The cross-sectional area of ​​the collimating channel (55) of the transmission device (5) is configured to be adjustable so as to allow different doses of radiation to be transmitted in the collimating channel (55).

9. The radiation attenuation device according to claim 8, characterized in that: The transmission device (5) comprises a plurality of baffles (533) arranged in the housing (51), and the baffles (533) surround at least a portion of the collimating channel (55).

10. The radiation attenuation device according to claim 9, characterized in that: The transmission device (5) further comprises an adjustment component, which is connected to at least one of the baffles (533) and is used to drive the baffle (533) to move between a gathering position for reducing the cross-sectional area of ​​the collimating channel (55) and a dispersion position for expanding the cross-sectional area.

11. The radiation attenuation device according to claim 10, characterized in that: The adjustment assembly is configured to drive the two baffles (533) to move closer to each other or away from each other.

12. The radiation attenuation device according to claim 11, characterized in that: The regulating component comprises: Two first adjustment parts (54) are symmetrically arranged in the housing (51) and slidably matched with the housing (51), and the two first adjustment parts (54) are arranged to be able to move closer to and away from each other; and Two second adjustment parts (53), each of the second adjustment parts (53) is telescopically installed in one of the first adjustment parts (54), and two baffles (533) are respectively installed on the first end facing each of the second adjustment parts (53) and the other second adjustment part (53), and a first angle is formed between the two baffles (533).

13. The radiation attenuation device according to claim 12, characterized in that: Each of the first adjusting parts (54) comprises: A slider (542) is slidably mounted in the housing (51); A first driving member (541) is mounted on the housing (51), and the first driving member (541) drives the slider (542) to move between a first position and a second position. A groove (56) is formed at the inner end of the slider, and the two grooves (56) cooperate with the four baffles (533) to enclose the collimating channel (55).

14. The radiation attenuation device according to claim 13, characterized in that: The slider (542) has a guide groove formed therein, comprising: a main groove (543) formed in the slider (542) and extending along a sliding direction of the slider (542); and Two auxiliary grooves (544) are symmetrically formed at the inner side ends of the main groove (543), and a second angle is formed between the two auxiliary grooves (544).

15. The radiation attenuation device according to claim 14, characterized in that: Each of the second adjusting parts (53) comprises: The moving rod (532) comprises: A main rod (5321) is slidably mounted in the main groove (543); Two auxiliary rods (5322) are formed at the inner end of the main rod (5321) close to the auxiliary groove (544), and a third angle is formed between the two auxiliary rods (5322); and A second driving member (531) is mounted on the sliding block (542), and the second driving member (531) drives the main rod (5321) to move along the main groove (543); Wherein, each auxiliary rod (5322) is pivotally mounted with a baffle (533) at the end away from the main rod (5321), the first end of the baffle (533) is located in the auxiliary groove (544), and the second end of the baffle (533) extends out of the auxiliary groove (544).

16. The radiation attenuation device according to claim 12, characterized in that: The adjustment component further comprises two shielding parts (52), which are respectively arranged on the outside of the collimating channel (55) in an openable and closable manner to shield at least a part of the rays leaking from the gap formed between adjacent baffles (533).

17. The radiation attenuation device according to claim 16, characterized in that: Each of the shielding parts (52) comprises: two shielding plates (521), each of the shielding plates (521) being slidably mounted on the first IB233741 adjusting portion (54); and A third driving member (522) is mounted on the first adjusting portion (54), and the third driving member (522) drives the shielding plate (521) to move between a third position and a fourth position.

18. A radioactive material detection system, characterized in that: include: The radiation attenuation device according to any one of claims 1 to 17, wherein a waste bucket (6) capable of emitting radiation is arranged near an input port of the collimation channel (55); as well as A detector (7), wherein a detection end of the detector (7) faces the output port of the collimation channel (55) so as to detect a radiation dose emitted from the output port.

Images