CN117476267A - Collimator structure for transmission radiation source - Google Patents

Abstract

There is provided a collimator structure for a transmissive radiation source, comprising: a transmission radiation source; the first shielding block is arranged on the emergent side of the transmission radioactive source and used for blocking rays emitted by the transmission radioactive source; a first collimation hole located on and penetrating the first shielding block; and the driving device is connected with the first shielding block and is used for driving the first shielding block to move so that rays emitted by the transmission radioactive source pass through the first collimation hole or are blocked by the first shielding block. The first shielding block can be driven by the driving device to move, so that the first collimation hole on the first shielding block is aligned or not aligned with the ray bundle emitted by the transmission radioactive source, and the shutdown treatment of the rays of the transmission radioactive source and the external environment is realized.

Description

Collimator structure for transmission radiation source

Technical Field

The present disclosure relates to the field of radiation detection technology, and in particular, to a collimator structure for a transmission radiation source.

Background

With the rapid development of the nuclear industry, the amount of nuclear waste produced has also increased dramatically, making it particularly important to dispose of and dispose of nuclear waste efficiently at a time. For safe and effective treatment and disposal of nuclear waste, the nuclides contained in the nuclear waste must be detected qualitatively and quantitatively, and then classified for disposal.

Currently, the sorting of nuclear waste is generally achieved using TGS (Tomographic Gamma Scanning, tomogamma scanning) technology. When the TGS technology is adopted, the rays emitted by the transmission radioactive source are emitted through the collimation hole, so that the rays pass through a waste bin for storing nuclear waste and then irradiate on the detector, and the radionuclide components contained in the nuclear waste can be analyzed. In the working gap or the non-working state, the rays emitted by the transmission radioactive source are not shielded, so that the rays easily radiate to the external environment.

Disclosure of Invention

In one aspect, there is provided a collimator structure for a transmissive radiation source, comprising: a transmission radiation source; the first shielding block is arranged on the emergent side of the transmission radioactive source and used for blocking rays emitted by the transmission radioactive source; a first collimation hole located on and penetrating the first shielding block; and the driving device is connected with the first shielding block and is used for driving the first shielding block to move so that rays emitted by the transmission radioactive source pass through the first collimation hole or are blocked by the first shielding block.

According to an embodiment of the disclosure, the radiation source further comprises a second shielding block and a second collimation hole positioned in the second shielding block, the transmission radiation source is arranged in the second shielding block, and rays emitted by the transmission radiation source are emitted along the second collimation hole.

According to an embodiment of the present disclosure, the centerline direction of the first collimation hole is parallel to the centerline direction of the second collimation hole and to the direction in the beam of the radiation emitted by the transmission radiation source.

According to an embodiment of the disclosure, the radiation source further comprises a shielding shell and a transmission hole, wherein the shielding shell is arranged on the outgoing side of the radiation source, a shielding inner cavity is formed in the shielding shell, the first shielding block is located in the shielding inner cavity, and the transmission hole is arranged on one side, far away from the radiation source, of the shielding shell and located on the path of rays emitted by the radiation source.

According to an embodiment of the present disclosure, the shielding shell is in sealing connection with the second shielding block to form the shielding inner cavity.

According to an embodiment of the disclosure, the shielding device further comprises a limit sensor, wherein the limit sensor is arranged in the shielding inner cavity and used for detecting the position of the first shielding block.

According to an embodiment of the present disclosure, the shielding device further comprises a damper block disposed in the shielding inner cavity for blocking the first shielding block from contact collision with the inner wall of the shielding shell.

According to the embodiment of the disclosure, the shielding device further comprises a guide block, wherein the guide block is arranged on the inner wall of the shielding shell and is propped against the first shielding block, and the first shielding block slides relatively with the guide block in a moving state.

According to an embodiment of the present disclosure, the driving device includes a ball screw connected with the first shielding block, and a driving element for driving the ball screw such that the first shielding block moves in an extending direction of the ball screw.

According to an embodiment of the present disclosure, the extending direction of the ball screw is parallel to the gravitational direction of the first shielding block.

According to the collimator structure for the transmission radiation source of the embodiment of the disclosure, the first shielding block is arranged on the emitting side of the transmission radiation source, and the first shielding block can be driven to move on the emitting side of the transmission radiation source by the driving device. In the moving process of the first shielding block, when the first collimation hole on the first shielding block is aligned with the ray bundle emitted by the transmission radioactive source, the ray emitted by the transmission radioactive source can be emitted through the first collimation hole, so that the normal detection process is carried out; when the first collimation hole on the first shielding block is not aligned with the ray bundle emitted by the transmission radioactive source, the ray emitted by the transmission radioactive source is blocked by the first shielding block, no detection is performed at the moment, and the shutdown treatment of the ray of the transmission radioactive source and the external environment can be realized.

Drawings

Other objects and advantages of the present disclosure will become apparent from the following description of the present disclosure with reference to the accompanying drawings, and may assist in a comprehensive understanding of the present disclosure.

Fig. 1 schematically illustrates an exploded view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure.

Fig. 2 schematically illustrates a front view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure.

Fig. 3 schematically illustrates a top view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure.

Fig. 4 schematically illustrates a left side view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure.

Fig. 5 schematically illustrates a right side view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure.

Fig. 6 schematically illustrates a rear view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure.

Fig. 7 schematically shows a cross-sectional view of the A-A' plane in fig. 3.

Fig. 8 schematically shows an enlarged view of the portion M in fig. 7.

Fig. 9 schematically shows a cross-sectional view of the B-B' plane in fig. 3.

Fig. 10 schematically shows an enlarged view of the portion N in fig. 9.

In the figure, 1, a transmission radiation source; 2. a first shielding block; 21. a first collimation hole; 3. a driving device; 31. a ball screw; 32. a driving element; 4. a second shielding block; 41. a second collimation hole; 5. a shield case; 51. a transmission hole; 52. shielding the inner cavity; 53. a limit sensor; 54. a damper block; 55. a guide block; 6. a third shielding block; 61. and (3) a safety lock.

It is noted that the dimensions of structures or regions may be exaggerated or reduced in the drawings for describing embodiments of the present disclosure for clarity, i.e., the drawings are not drawn to actual scale.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items.

In this document, unless specifically stated otherwise, directional terms such as "upper," "lower," "left," "right," "inner," "outer," and the like are used to denote orientations or positional relationships shown based on the drawings, and are merely used to facilitate the description of the present disclosure, rather than to indicate or imply that the devices, elements, or components referred to must have a particular orientation, be configured or operated in a particular orientation. It should be understood that when the absolute positions of the described objects are changed, the relative positional relationship they represent may also be changed accordingly. Accordingly, these directional terms should not be construed to limit the present disclosure.

Embodiments of the present disclosure provide a collimator structure for a transmissive radiation source, comprising: a transmission radiation source 1; a first shielding block 2, which is disposed at the outgoing side of the transmission radiation source 1 and is used for blocking the rays emitted by the transmission radiation source 1; a first alignment hole 21 located on the first shielding block 2 and penetrating the first shielding block 2; and a driving device 3 connected with the first shielding block 2 for driving the first shielding block 2 to move so that the rays emitted by the transmission radiation source 1 pass through the first collimation hole 21 or are blocked by the first shielding block 2. By the above-described structural design, the first shielding block 2 is provided on the emission side of the transmission radiation source 1 from which rays are emitted, and the first shielding block 2 can be driven to move on the emission side of the transmission radiation source 1 by the driving device 3. During the movement of the first shielding block 2, when the first collimation hole 21 on the first shielding block 2 is aligned with the beam emitted by the transmission radiation source 1, the radiation emitted by the transmission radiation source 1 can be emitted through the first collimation hole 21, so that the normal detection process is performed; when the first collimation hole 21 on the first shielding block 2 is not aligned with the ray bundle emitted by the transmission radioactive source 1, the ray emitted by the transmission radioactive source 1 is blocked by the first shielding block 2, and no detection is performed at this time, so that the shutdown processing of the ray of the transmission radioactive source 1 and the external environment can be realized.

It should be noted that, in this document, the description of the "aligned" and "misaligned" states can be understood by referring to the above description, and the following description is omitted.

Fig. 1 schematically illustrates an exploded view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure. Fig. 2 schematically illustrates a front view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure. Fig. 3 schematically illustrates a top view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure. Fig. 4 schematically illustrates a left side view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure. Fig. 5 schematically illustrates a right side view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure. Fig. 6 schematically illustrates a rear view of a collimator structure for a transmissive radiation source according to an embodiment of the disclosure. Fig. 7 schematically shows a cross-sectional view of the A-A' plane in fig. 3. Fig. 8 schematically shows an enlarged view of the portion M in fig. 7. Fig. 9 schematically shows a cross-sectional view of the B-B' plane in fig. 3. Fig. 10 schematically shows an enlarged view of the portion N in fig. 9.

Referring to fig. 1 to 10, a collimator structure for a transmission radiation source according to an embodiment of the present disclosure includes at least a transmission radiation source 1, a first shielding block 2, a first collimation hole 21, and a driving device 3.

The transmission radiation source 1 is used to emit radiation, and the transmission radiation source 1 is typically associated with a detector. When the transmission radioactive source 1 and the detector are used for detection, the transmission radioactive source 1 and the detector are respectively arranged at two sides of an object to be detected, so that rays emitted by the transmission radioactive source 1 reach the detector after passing through the object to be detected, and the attenuation condition of the rays emitted by the transmission radioactive source 1 can be detected through the detector, so that components to be detected are analyzed. For example, when a waste bin storing nuclear waste is subjected to transmission scanning by using a TGS technique, gamma rays emitted from a transmission radiation source 1 outside the waste bin penetrate the waste bin, and the attenuation coefficient or medium density of each voxel medium to photons is obtained by measuring the attenuation of the rays in the waste bin. The specific process is as follows: the energy spectrum of the transmitted radiation source 1 is first measured before the waste bin is not placed, then the waste bin is placed and the radiation spectrum is measured again, the measured energy spectrum again not only comprising the attenuation of the radiation emitted by the transmitted radiation source 1 through the waste binThe subtracted radiation information also contains the radiation information emitted by the radionuclide in the waste bin. The attenuation coefficient of the medium in the barrel under each energy can be obtained through transmission reconstruction, and the density of the medium can be further obtained by utilizing the corresponding relation between the attenuation coefficient and the density, so that the radionuclide component can be analyzed. For example, can select ¹⁵² Eu is used as the transmission radiation source 1, ¹⁵² eu can emit gamma rays with more than 30 characteristic energies at the same time, the energy range extends from low energy to high energy, and the gamma rays with different energy segments emitted in the sample can be corrected by linear attenuation coefficients, so that systematic errors are reduced.

The first shielding block 2 is arranged on one side of the radiation emitted by the transmission radiation source 1 and is used for blocking and shielding the radiation emitted by the transmission radiation source 1, so that radiation to the external environment caused by the radiation emitted by the transmission radiation source 1 in a non-working state is prevented, and the human health is prevented from being damaged. For example, the material of the first shielding block 2 may be doped with lead or tungsten metal, which can effectively shield rays. Further, since the density of lead is smaller than that of tungsten, the first shielding block 2 made of lead has a larger volume than the first shielding block 2 made of tungsten, and the corresponding collimator structure has a larger volume, which is inconvenient to use. And lead has a lower hardness than tungsten, it is actually considered that tungsten is preferable as a shielding material. For example, the material of the first shielding block 2 in actual engineering production may be 95W-Ni-Fe (95% W, 5% Ni-Fe, density 18.04-18.11 g/cm) ³ )。

The first collimation hole 21 penetrates through the first shielding block 2, the first collimation hole 21 is provided with a first end and a second end, the first end of the first collimation hole 21 is located on one side, close to the transmission radiation source 1, of the first shielding block 2, and the second end of the first collimation hole 21 is located on one side, far away from the transmission radiation source 1, of the first shielding block 2. When the first collimation hole 21 is aligned with the beam emitted from the transmission radiation source 1, the radiation emitted from the transmission radiation source 1 can be injected from the first end of the first collimation hole 21, and after passing through the entire first collimation hole 21, is emitted through the second end of the first collimation hole 21, so that the detection operation can be smoothly performed.

The driving device 3 is connected to the first shielding block 2, and the first shielding block 2 can be driven to move on the outgoing side of the transmission radiation source 1 by the driving device 3. When the first collimation hole 21 on which the first shielding block 2 moves is aligned with the transmission radiation source 1, the radiation emitted from the transmission radiation source 1 can pass through the first collimation hole 21, and the transmission radiation source 1 can work normally. When the first alignment hole 21 on which the first shielding block 2 moves is misaligned with the transmission radiation source 1, that is, rays emitted from the transmission radiation source 1 are blocked by the first shielding block 2, the first shielding block 2 may shield the rays emitted from the transmission radiation source 1 from the outside.

It should be understood that the transmission radiation source 1 is not limited to detecting a waste bin storing nuclear waste, and the transmission radiation source 1 may be any other radiation-emitting form, and this is not a limitation in the embodiments of the present disclosure.

Referring to fig. 7 and 8, the collimator structure for a transmission radiation source according to an embodiment of the present disclosure may further include a second shielding block 4 and a second collimation hole 41 located in the second shielding block 4, the transmission radiation source 1 being disposed in the second shielding block 4, and rays emitted from the transmission radiation source 1 being emitted along the second collimation hole 41.

Specifically, the second shielding block 4 may have a cavity for accommodating the transmission radiation source 1, and when the transmission radiation source 1 is disposed in the cavity, the transmission radiation source 1 may be shielded omnidirectionally by the second shielding block 4, so as to avoid radiation from causing to the external environment. For example, similar to the material of the first shielding block 2, the material of the second shielding block 4 may also be doped with lead or tungsten metal, which can effectively shield rays.

The second collimation hole 41 is arranged in the second shielding block 4, one end of the second collimation hole 41 is communicated with the cavity in the second shielding block 4, and the other end of the second collimation hole 41 extends out of the second shielding block 4. When the transmission radiation source 1 is placed in the cavity, the radiation emitted by the transmission radiation source 1 can be emitted out of the second shielding block 4 along the second collimation hole 41. When the second collimation hole 41 is aligned with the first collimation hole 21, the radiation emitted by the transmission radiation source 1 can be sequentially emitted through the second collimation hole 41 and the first collimation hole 21, and the transmission radiation source 1 can work normally at this time. When the second collimation hole 41 is misaligned with the first collimation hole 21, the first shielding block 2 completely blocks the radiation emitted through the second collimation hole 41, and the transmission radiation source 1 does not perform detection at this time.

In some exemplary embodiments, the centerline direction of the first collimation hole 21 may be parallel to the centerline direction of the second collimation hole 41 and to the direction in the beam of radiation emitted by the transmission radiation source 1.

For example, the second collimation hole 41 may be a cylindrical hole, and the direction of the center line of the second collimation hole 41 is parallel to the direction of the beam emitted by the transmission radiation source 1, so that the radiation emitted by the transmission radiation source 1 is beneficial to be emitted through the second collimation hole 41. The first collimation hole 21 may be a cylindrical hole, and the direction of the center line of the first collimation hole 21 may be parallel to the direction of the beam emitted from the transmission radiation source 1 and the direction of the center line of the second collimation hole 41. Thus, when the first collimation hole 21 is aligned with the second collimation hole 41, particularly when the center lines of the first collimation hole 21 and the second collimation hole 41 coincide, the interiors of the first collimation hole 21 and the second collimation hole 41 can communicate to form a passage through which the radiation passes. Also, to ensure that the intensity of the radiation transmitted through the radiation source 1 in the normal operating state is not affected, the diameter of the first collimation hole 21 may be designed to exceed the diameter of the second collimation hole 41, so that the radiation is not blocked and weakened by the first shielding block 2 when entering the first collimation hole 21 through the second collimation hole 41.

The shapes of the first and second collimation holes 21 and 41 are not limited to cylindrical holes, and any shape may be used as long as the rays emitted from the transmission radiation source 1 can pass through the first and second collimation holes 21 and 41 when the first and second collimation holes 21 and 41 are aligned. For example, the first alignment hole 21 and the second alignment hole 41 may also be square holes or the like.

Referring to fig. 3-7, a collimator structure for a transmission radiation source according to an embodiment of the disclosure may further include a third shielding block 6 and a safety lock 61. The third shielding block 6 is arranged at a side of the second shielding block 4 remote from the second collimation hole 41, and the third shielding block 6 is used for shielding radiation of the transmission radiation source 1 together with the second shielding block 4. A safety lock 61 is provided on the third shielding block 6 for connecting and locking the third shielding block 6 with the second shielding block 4, preventing the transmission radiation source 1 from being easily replaced or taken out, thereby playing a protective role. For example, similar to the materials of the first shielding block 2 and the second shielding block 4, the material of the third shielding block 6 may be doped with lead or tungsten metal, which can effectively shield rays.

Through the above structural design, when the transmission radiation source 1 is installed, the transmission radiation source 1 can be positioned through the second collimation hole 41, the transmission radiation source 1 is installed at the end part of the second collimation hole 41 in the second shielding block 4, and the third shielding block 6 is connected with the second shielding block 4 by using the screw, so that the transmission radiation source 1 is fixed in the second shielding block 4. Thus, not only the radiation of the transmission radiation source 1 can be shielded in all directions, but also the transmission radiation source 1 can be replaced in a detachable manner.

Referring to fig. 1 and 2, the collimator structure for a transmission radiation source 1 according to an embodiment of the present disclosure may further include a shielding case 5 and a transmission hole 51, the shielding case 5 being disposed at an exit side of the transmission radiation source 1, an inside of the shielding case 5 having a shielding inner cavity 52, the first shielding block 2 being located in the shielding inner cavity 52, the transmission hole 51 being disposed at a side of the shielding case 5 remote from the transmission radiation source 1 and being located in a path of rays emitted from the transmission radiation source 1.

In the embodiment of the present disclosure, the shielding shell 5 may be a hollow structure, in which a shielding inner cavity 52 is formed, and the shielding shell 5 may be made of a material capable of shielding radiation. For example, similar to the material of the first shielding block 2, the material of the shielding case 5 may be doped with lead or tungsten metal, which can effectively shield rays.

The first shielding block 2 is arranged in the shielding inner cavity 52, and the driving device 3 can drive the first shielding block 2 to move in the shielding inner cavity 52, so that the first alignment holes 21 on the first shielding block 2 are aligned or not aligned with the second alignment holes 41 on the second shielding block 4. For example, the drive device 3 may be arranged outside the shielding housing 5 and fastened to the shielding housing 5, and the output end of the drive device 3 may extend into the shielding interior 52 and be connected to the first shielding block 2, so that the first shielding block 2 is driven to move in the shielding interior 52.

The side of the shielding case 5 away from the transmission radiation source 1 is opened with a transmission hole 51 communicating the inside and the outside of the shielding case 5, and the transmission hole 51 is located on a path of the radiation emitted from the transmission radiation source 1, i.e., the transmission hole 51 is located on an extension line of the center line of the second collimation hole 41. When the first shielding block 2 is moved to a position where the first collimation hole 21 is aligned with the second collimation hole 41, the radiation emitted from the transmission radiation source 1 can pass through the second collimation hole 41 and the first collimation hole 21 in order, and then pass out through the transmission hole 51 to be detected. When the first shielding block 2 is moved to a position where the first collimation hole 21 is not aligned with the second collimation hole 41, the first shielding block 2 can block the radiation emitted from the transmission radiation source 1 from reaching the transmission hole 51, and at this time, the transmission radiation source 1 does not perform the detection work.

Therefore, the shielding shell 5 can further play a shielding role on rays emitted by the transmission radioactive source 1, and meanwhile, the first shielding block 2 and the first collimation holes 21 on the first shielding block can also play a protective role, so that foreign matters such as dust and the like outside are prevented from entering the first collimation holes 21, and the first collimation holes 21 are blocked, so that the rays are influenced to normally pass through the first collimation holes 21.

Referring to fig. 1-7, according to an embodiment of the present disclosure, the shield shell 5 is sealingly connected with the second shield block 4 to form a shield cavity 52.

For example, an opening is formed on one side of the shielding case 5, and the shielding cavity 52 is formed by sealing and connecting the opening with one side of the second shielding block 4 where the second alignment hole 41 is formed, so that the shielding cavity 52 is communicated with the external environment only through the transmission hole 51. Thus, the shield cavity 52 is substantially sealed, and impurities such as dust can be prevented from entering the shield cavity 52 to block the first alignment hole 21 or the second alignment hole 41.

With continued reference to fig. 1, according to an embodiment of the present disclosure, the driving device 3 includes a ball screw 31 and a driving member 32, the ball screw 31 being connected with the first shielding block 2, the driving member 32 being for driving the ball screw 31 such that the first shielding block 2 moves in an extending direction of the ball screw 31.

In an embodiment of the present disclosure, the driving element 32 may be disposed outside the shield case 5 and fixed to the shield case 5, and an output end of the driving element 32 is connected with the ball screw 31. The ball screw 31 protrudes into the shielding interior 52 and is connected to the first shielding block 2, and the first shielding block 2 can be driven by the drive element 32 to move in a linear manner along the direction of extension of the ball screw 31. When the first shielding block 2 is moved to a position where the first collimation hole 21 is aligned with or misaligned with the second collimation hole 41, the radiation emitted from the transmission radiation source 1 can be normally emitted or blocked by the first shielding block 2.

For example, the driving element 32 may comprise a servomotor, the output of which is provided with a coupling, i.e. the driving element 32 is connected to the first shielding block 2 via the coupling, so as to drive the first shielding block 2 in motion. It should be appreciated that in other embodiments, the drive element 32 may be any form of drive other than a servo motor, for example, the drive element 32 may be hydraulically driven.

Referring to fig. 9, according to an embodiment of the present disclosure, the extending direction of the ball screw 31 is parallel to the gravitational direction of the first shielding block 2. Since the ball screw 31 does not have a self-locking function, when a malfunction occurs or the driving element 32 is powered off or damaged, the ball screw 31 loses the driving force, and the first shielding block 2 on the ball screw 31 freely falls to the lowest point along the ball screw 31 under the action of self gravity. And, the first alignment hole 21 and the second alignment hole 41 at the lowest point are not aligned, so that the radiation emitted by the transmission radiation source 1 can be automatically shielded when power failure or fault condition occurs, and the safety is ensured.

It should be noted that the extending direction of the ball screw 31 is not necessarily parallel to the gravitational direction of the first shielding block 2, as long as the first shielding block 2 is ensured to be able to slide freely along the ball screw 31. For example, in other embodiments, the extending direction of the ball screw 31 may be at an angle of 15 °, 20 °, 30 ° with respect to the gravitational direction, and if the ball screw 31 loses the driving force, the first shielding block 2 will slide down the ball screw 31 to the lowest point.

Referring to fig. 9 and 10, the collimator structure for the transmission radiation source 1 according to the embodiment of the present disclosure may further include a limit sensor 53, the limit sensor 53 being disposed in the shielding inner cavity 52 for detecting the position of the first shielding block 2. In an embodiment of the present disclosure, a limit sensor 53 may be fixed to an inner wall of the shielding case 5 for detecting and judging whether the first shielding block 2 is moved to a position where the first alignment hole 21 is aligned with the second alignment hole 41.

For example, the driving device 3 may drive the first shielding block 2 to move in the vertical direction, and two limit sensors 53 may be provided in the vertical direction. The two limit sensors 53 are a first limit sensor and a second limit sensor, respectively, and the first limit sensor and the second limit sensor are disposed opposite to each other along a direction of a ray emitted by the transmission radiation source 1. Specifically, a first limit sensor is fixed to the bottom of the shielding cavity 52, and a second limit sensor is fixed to the top of the shielding cavity 52. When the drive element 32 is de-energized or the transmission radiation source 1 is not in operation, the first shielding block 2 freely falls along the ball screw 31 to a lowest point, which is denoted as an initial position of the first shielding block 2. In the initial position, the first alignment holes 21 on the first shielding block 2 are not aligned with the second alignment holes 41 on the second shielding block 4. When the driving element 32 drives the first shielding block 2 to move to the position where the second limit sensor is located, the first alignment hole 21 on the first shielding block 2 is aligned with the second alignment hole 41 on the second shielding block 4, and the position where the first shielding block 2 is located is referred to as a termination position. When the first shielding block 2 is located at any position between the initial position and the end position, the radiation emitted by the transmission radiation source 1 is always blocked by the first shielding block 2. By arranging the first limit sensor and the second limit sensor at the initial position and the final position respectively, the position of the first shielding block 2 can be detected and judged, and the real-time position of the first shielding block 2 can be adjusted, so that the first alignment hole 21 is aligned or not aligned with the second alignment hole 41.

It should be noted that, herein, the expressions "vertical direction", "top" and "bottom" are all references to the directions in the drawings, and are not limitations of the specific structures of the embodiments of the present disclosure. It should be further noted that the first limit sensor and the second limit sensor are merely exemplary herein, and a greater number of limit sensors 53 may be provided in actual application.

It will be appreciated that in some embodiments the position of the first shielding block 2 may also be controlled directly by the driving means 3. For example, the driving device 3 may be electrically connected to a controller, and the output power of the driving device 3 may be regulated by the controller, so as to control the real-time position of the first shielding block 2 such that the first alignment hole 21 is aligned with or misaligned from the second alignment hole 41.

With continued reference to fig. 9 and 10, a collimator structure for a transmission radiation source according to an embodiment of the disclosure may further include a damper block 54, the damper block 54 being disposed in the shielding inner cavity 52 for blocking contact collision of the first shielding block 2 with an inner wall of the shielding housing 5.

For example, the damper block 54 may be provided on the inner wall of the shield case 5, between the shield case 5 and the first shield block 2. Specifically, when the driving element 32 and the ball screw 31 drive the first shielding block 2 to move along the gravity direction, the damping blocks 54 may be disposed on the shielding shell 5 at the bottom and the top of the shielding cavity 52. When the first shielding block 2 is moved to the initial position or the end position, the first shielding block 2 is abutted against the shock-absorbing blocks 54 at the bottom and top of the shielding inner cavity 52, respectively. The damper block 54 may be made of flexible material, and is used for buffering and absorbing shock, so as to avoid the first shielding block 2 from being damaged due to contact collision with the inner wall of the shielding shell 5. At the same time, the damper block 54 may also act as a stop, for example, when the first shielding block 2 is moved against the damper block 54 at the top of the shielding inner cavity 52, the first alignment hole 21 is just aligned with the second alignment hole 41.

The collimator structure for a transmission radiation source according to an embodiment of the present disclosure may further include a guide block 55, the guide block 55 being disposed on an inner wall of the shielding case 5 and abutting against the first shielding block 2, the first shielding block 2 relatively sliding between the first shielding block 2 and the guide block 55 in a moving state.

For example, the first shielding block 2 has opposite first and second sides, the first side of the first shielding block 2 may be connected with the ball screw 31, and the second side of the first shielding block 2 may be abutted against the guide block 55 provided on the inner wall of the shielding case 5. When the first shielding block 2 moves along the ball screw 31, the second side of the first shielding block 2 may slide with respect to the guide block 55, i.e., the guide block 55 and the ball screw 31 are clamped at both sides of the first shielding block 2, respectively. The guide block 55 can be used for guiding the moving direction of the first shielding block 2, so that the first alignment hole 21 on the first shielding block 2 can be aligned with the second alignment hole 41 on the second shielding block 4 accurately.

The workflow of the collimator structure for a transmissive radiation source of an embodiment of the present disclosure may be: when the transmission radiation source 1 is in the non-operating state, the first shielding block 2 is located at a start position where the first collimation hole 21 is not aligned with the second collimation hole 41, i.e., the first shielding block 2 can block the second collimation hole 41. When the transmission radiation source 1 starts to work, the first shielding block 2 starts to move under the drive of the driving device 3, and when the first shielding block 2 moves to the end position, the first collimation hole 21 is aligned with the second collimation hole 41, the driving of the first shielding block 2 is stopped, and the state is kept at the moment, so that the rays emitted by the transmission radiation source 1 can sequentially pass through the first collimation hole 21 and the second collimation hole 41 and are emitted along the transmission hole 51 to be detected. When the detection operation of the transmission radiation source 1 is completed, the first shielding block 2 is driven to return to the initial position by the driving device 3.

A collimator structure for a transmissive radiation source according to an embodiment of the present disclosure has at least one of the following technical effects:

(1) The first shielding block 2 can be driven by the driving device 3 to move, so that the first collimation hole 21 on the first shielding block 2 is aligned or not aligned with the ray emitted by the transmission radioactive source 1, and the shut-off treatment of the ray of the transmission radioactive source 1 and the external environment is realized.

(2) The first shielding block 2 can be driven by the driving element 32 and the ball screw 31, when the driving element 32 is powered off or in a fault state, the ball screw 31 does not have a self-locking function, so that the first shielding block 2 can automatically fall to a state that the first alignment hole 21 is not aligned with the second alignment hole 41 under the action of gravity, and the automatic power-off protection is realized.

Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims (10)

1. A collimator structure for a transmission radiation source, comprising:

a transmission radiation source;

the first shielding block is arranged on the emergent side of the transmission radioactive source and used for blocking rays emitted by the transmission radioactive source;

a first collimation hole located on and penetrating the first shielding block; and

and the driving device is connected with the first shielding block and is used for driving the first shielding block to move, so that rays emitted by the transmission radioactive source pass through the first collimation hole or are blocked by the first shielding block.

2. The collimator structure for a transmission radiation source of claim 1 further comprising a second shielding block and a second collimation aperture in the second shielding block,

the transmission radioactive source is arranged in the second shielding block, and rays emitted by the transmission radioactive source are emitted along the second collimation holes.

3. The collimator structure of claim 2 wherein a centerline direction of the first collimation aperture is parallel to a centerline direction of the second collimation aperture and to a direction in a beam of radiation emitted by the transmissive radiation source.

4. The collimator structure of claim 2 further comprising a shielding housing disposed on an exit side of the transmission radiation source, the shielding housing having a shielding cavity therein, the first shielding block being located in the shielding cavity, and a transmission aperture disposed on a side of the shielding housing remote from the transmission radiation source and in a path of radiation emitted by the transmission radiation source.

5. The collimator structure of claim 4 wherein the shield housing is sealingly connected to the second shield block to form the shield cavity.

6. The collimator structure of claim 4 further comprising a limit sensor disposed in the shielded cavity for detecting the position of the first shielding block.

7. The collimator structure of claim 4 further comprising a damper disposed in the shielding cavity for blocking contact collisions of the first shielding block with an inner wall of the shielding housing.

8. The collimator structure of claim 4 further comprising a guide block disposed on an inner wall of the shielding housing and abutting the first shielding block,

the first shielding block slides relatively with the guide block in a moving state.

9. The collimator structure for a transmission radiation source according to any one of claims 1 to 8, wherein the driving means includes a ball screw connected to the first shielding block and a driving member for driving the ball screw such that the first shielding block moves in an extending direction of the ball screw.

10. The collimator structure of claim 9 wherein the ball screw extends parallel to the direction of gravity of the first shielding block.