Collimation adjusting device and nuclear radiation detection device

Abstract

The invention relates to the technical field of nuclear radiation detection, and discloses a collimation adjustment device and a nuclear radiation detection device. According to the invention, the collimation adjusting device comprises a moving body arranged corresponding to a ray receiving hole, a plurality of radiation adjusting holes with different apertures are formed in the moving body in a penetrating manner, the moving body can move relative to the ray receiving hole, the radiation adjusting holes and the ray receiving hole are arranged correspondingly in the axial direction, and a nuclear radiation detection device is arranged on the moving body. Comprising a sample chamber and a detection chamber, a collimation hole is formed in the end, facing the detection chamber, of the sample chamber, a detector is arranged in the detection chamber, a ray receiving hole is formed in the end, facing the sample chamber, of the detector, and the collimation adjusting device is arranged between the sample chamber and the detection chamber. The radiation adjusting holes with different apertures correspond to the ray receiving holes in the axial direction, so that the convenience and the stability of the nuclear radiation detection device are improved, the measurement accuracy can be improved, and the measurement application range of the nuclear radiation detection device is widened.

Description

Technical Field

[0001] The invention relates to the field of nuclear radiation detection, and in particular to a collimation adjustment device and a nuclear radiation detection device. Background Art

[0002] In the technical field of nuclear radiation detection devices, a sample chamber and a detection chamber are generally provided. A detector is provided in the detection chamber. The radiation rays of the sample to be tested in the sample chamber are transmitted to the surface of the detector through the collimating hole, thereby receiving the radiation dose reaching its surface, measuring it and feeding back the measurement results.

[0003] In the prior art, the nuclear radiation detection device only has a collimating hole with a single aperture. When the total radioactivity concentration of the sample is too high or too low, it will exceed the range of the nuclear radiation detection device, resulting in a deviation in the measurement result, thereby limiting the scope of application of the nuclear radiation detection device. In order to increase the scope of application of the nuclear radiation detection device, the prior art generally requires terminating the detection program, opening the nuclear radiation detection device, and manually replacing the collimating fixture to adjust the total radioactivity concentration of the sample passing through the collimating hole, so that the total radioactivity concentration of the sample passing through the shielded lead chamber is within the range of the nuclear radiation detection device. The disadvantage of this method is that it is time-consuming and labor-intensive, and inconvenient to operate. Summary of the invention

[0004] The object of the present invention is to provide a collimation adjustment device and a nuclear radiation detection device, so as to improve the convenience and stability of the nuclear radiation detection device and increase the application scope of the nuclear radiation detection device.

[0005] In order to solve the above technical problems, the embodiments of the present invention provide a technical solution as follows:

[0006] A collimation adjustment device comprises a mobile body arranged corresponding to a ray receiving hole, a plurality of radiation adjustment holes with different apertures are penetrated on the mobile body, the mobile body can be displaced relative to the ray receiving hole, and the radiation adjustment hole is arranged axially corresponding to the ray receiving hole. By arranging the collimation adjustment device, the radiation adjustment holes with different apertures of the collimation adjustment device correspond axially to the ray receiving hole, and the total radioactivity concentration of the sample passing through the radiation adjustment hole is adjusted, thereby improving the convenience and stability of the nuclear radiation detection device, thereby improving the measurement accuracy, and increasing the measurement application range of the nuclear radiation detection device.

[0007] Furthermore, it comprises a guide rail, the guide rail is slidably matched with a slider, and the mobile body is fixedly arranged relative to the slider. The cooperation between the guide rail and the slider is conducive to increasing the stability of the linear displacement of the mobile problem and the accuracy of the displacement.

[0008] Furthermore, it also includes a driving device, wherein the output end of the driving device is provided with a driving wheel, the slider is fixedly provided with a transmission block, one end of the transmission block is fixedly provided with a transmission rack, and the other end is fixedly provided with the mobile body, and the driving wheel is meshed with the transmission rack for transmission. Through the setting of the driving device, the movement of the mobile body is mechanized.

[0009] Furthermore, the driving device is a servo motor, the driving wheel is a gear, and the driving wheel drives the transmission rack to move linearly by rotating. Through the setting of the servo motor, the movement of the mobile body can be more conveniently controlled automatically.

[0010] Furthermore, the guide rail is provided with limit blocks at both ends along the axial direction, and the limit blocks can block the transmission block along the axial direction. The limit blocks mechanically limit the transmission block, which can prevent the slider from sliding off the track when the motor runs abnormally and cause unexpected safety accidents.

[0011] Furthermore, it includes induction sheets fixedly arranged at both ends of the transmission block and induction slots arranged between the limit blocks, and the induction sheets and the induction slots can sense each other to trigger the stop signal of the driving device. Through the arrangement of the induction sheets and the induction slots, the moving position of the transmission block relative to the slide rail can be effectively limited, the stroke of the mobile body can be reasonably set, and at the same time, the safety of the movement of the mobile body can be further increased.

[0012] Furthermore, the aperture of the radiation adjustment hole is not larger than the aperture of the ray receiving hole.

[0013] Furthermore, the movable body is composed of a lead-clad steel structure, and three radiation adjustment holes are provided, and the radiation adjustment holes are arranged in sequence according to the aperture size.

[0014] In order to solve the above technical problems, the present invention also provides a nuclear radiation detection device, including a sample chamber and a detection chamber, wherein a detector is arranged in the detection chamber, a collimation hole is arranged at one end of the sample chamber facing the detection chamber, a ray receiving hole is arranged at one end of the detector facing the sample chamber, and a collimation adjustment device as described in any one of the above is arranged between the sample chamber and the detection chamber. The arrangement of the collimation adjustment device is conducive to improving the convenience and stability of the nuclear radiation detection device, and increasing the scope of application of the nuclear radiation detection device.

[0015] Furthermore, a control device is included, and the control device can issue instructions to the driving device according to the feedback signal of the detection room, and adjust the relative position of the radiation adjustment hole and the ray receiving hole through the driving device. Through the setting of the control device, the various components of the nuclear radiation detection device can be coordinated and controlled to realize the automatic adjustment of the relative position of the radiation adjustment hole and the ray receiving hole. Through the setting of the control device, the collimation adjustment device can be automatically adjusted according to the feedback signal of the detection room, so that the total radioactivity concentration of the sample passing through the radiation adjustment hole is within the range of the nuclear radiation detection device, which further increases the convenience and stability of the nuclear radiation detection device and is conducive to improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 It is a schematic diagram of the overall structure of a nuclear radiation detection device in one embodiment of the present invention;

[0018] Figure 2 is a schematic cross-sectional structure diagram of a nuclear radiation detection device in one embodiment of the present invention;

[0019] Figure 3 It is a schematic diagram of the relative position structure of the alignment adjustment device and the detection chamber in one embodiment of the present invention.

[0020] Explanation of the reference numerals: 10, sample chamber; 20, collimation adjustment device; 200, mobile body; 30, detection chamber; 11, sample bottle; 12, collimation hole; 21, radiation adjustment hole; 211, first adjustment hole; 212, second adjustment hole; 213, third adjustment hole; 22, driving device; 221, driving wheel; 201, limit block; 202, induction sheet; 203, induction slot; 204, transmission rack; 205, transmission block; 206, slider; 207, guide rail; 31, detector; 32, ray receiving hole; 40, bottom plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present invention, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection in the claims of the present application can be implemented.

[0022] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] like Figure 1-2 As shown, one embodiment of the present invention relates to a nuclear radiation detection device, including a sample chamber 10 and a detection chamber 30, wherein the sample chamber 10 is used to carry a sample to be detected or a sample bottle 11 containing the sample to be detected, and a collimation hole 12 is provided at one end of the sample chamber facing the detection chamber; a detector 31 is provided in the detection chamber 30, and the detector 31 is used to receive the gamma ray dose reaching its surface and measure and feedback the measurement result; a ray receiving hole 32 is provided at one end of the detection chamber 30 facing the sample chamber 10, and the collimation hole 12 and the ray receiving hole 32 constitute a path for the radiation of the sample to be detected to reach the detector 31; A collimation adjustment device 20 is provided between the sample chamber 10 and the detection chamber 30. The collimation adjustment device 20 is provided with a plurality of radiation adjustment holes 21 of different apertures. The radiation adjustment holes 21 can correspond axially with the ray receiving holes 32. Through the axial correspondence between different radiation adjustment holes 21 and the ray receiving holes 32, the total radioactivity concentration of the sample passing through the radiation adjustment holes 21 can be effectively adjusted, that is, the gamma ray dose transmitted by the sample to be tested to reach the surface of the detector 31, thereby improving the convenience and stability of the nuclear radiation detection device, thereby improving the measurement accuracy and increasing the measurement application range of the nuclear radiation detection device. In an exemplary embodiment, the sample chamber 10 is a frame structure composed of steel-clad lead, which can shield the leakage of radioactive rays from the source of the sample to be tested internally, avoid radiation damage to the operator caused by high-activity radioactive samples, and shield the background effect caused by cosmic rays entering the lead chamber externally; the detection chamber 30 is a frame structure composed of steel-clad lead, which shields the environmental interference caused by cosmic rays entering the detection chamber 30, resulting in the influence of measurement accuracy.

[0024] like Figure 3As shown, in one embodiment, it relates to a nuclear radiation detection device, the detection chamber 30 is fixedly arranged on a bottom plate 40, and a collimation adjustment device 20 is arranged corresponding to the detection chamber 30, and the collimation adjustment device 20 includes a mobile body 200 arranged corresponding to the ray receiving hole 32, and three radiation adjustment holes 21 with different aperture sizes are penetrated on the mobile body 200, and the central axes of the radiation adjustment holes 21 are located on the same horizontal plane, and the radiation adjustment holes 21 are arranged in descending order of aperture, i.e., a first adjustment hole 211, a second adjustment hole 212. , the third adjustment hole 213, the mobile body 200 can drive the radiation adjustment hole 21 to be axially corresponding to the radiation receiving hole 32 by horizontally moving relative to the radiation receiving hole 32, that is, according to the needs, the first adjustment hole 211 is adjusted to be corresponding to the radiation receiving hole 32, or the second adjustment hole 212 is adjusted to be corresponding to the radiation receiving hole 32, or the third adjustment hole 213 is adjusted to be corresponding to the radiation receiving hole 32, so that the gamma ray dose transmitted from the sample bottle 11 to the surface of the detector 31 can be adjusted by switching to radiation adjustment holes 21 with different aperture sizes. According to actual measurement requirements and the measurement range of the detection chamber 30, the number of the radiation adjustment holes 21 can also be set to 2, 4, 5, etc. Preferably, the aperture of the radiation adjustment hole 21 is not larger than the aperture of the radiation receiving hole 32, and the mobile body 200 is a steel-clad lead structure, which can effectively prevent the radiation of the sample to be tested from being radiated from the part outside the radiation adjustment hole 21 to the radiation receiving hole 32.

[0025] In one embodiment, a collimation adjustment device 20 is provided, wherein the collimation adjustment device 20 comprises a guide rail 207 fixedly arranged on a bottom plate 40, a slider 206 is provided in sliding cooperation with the guide rail, and the mobile body 200 is directly or indirectly fixedly arranged on the slider 206, so as to be able to slide relative to the bottom plate 40. The cooperation between the guide rail 207 and the slider 206 is conducive to increasing the stability of the linear displacement of the mobile problem and the accuracy of the displacement.

[0026] In an exemplary example, the collimation adjustment device 20 further includes a driving device 22, the output end of the driving device 22 is provided with a driving wheel 221, a transmission block 205 is fixedly provided on the slider 206, one end of the transmission block 205 is fixedly provided on the mobile body 200, one end of the transmission block 205 is fixedly provided with a transmission rack 204, and the driving wheel 221 and the transmission rack 204 are meshed for transmission, and the other end of the transmission block 205 is fixedly connected to the mobile body 200, so that the transmission block 205 and the mobile body 200 can be driven by the driving device 22 to move horizontally, and adjust the relative position of the radiation adjustment hole 21 and the ray receiving 32. Preferably, the driving device 22 is a servo motor.

[0027] In one embodiment, an alignment adjustment device 20 is provided, wherein a limit block 201 is provided at each end of a guide rail 207 along the axial direction, and the limit block 201 can stop the transmission block 205 along the axial direction. The transmission block 205 is mechanically limited by the limit block 201, so that when the motor operates abnormally, the slider 206 can be prevented from sliding off the track to cause an unexpected safety accident. Preferably, sensing sheets 202 are fixedly provided at both ends of the transmission block 205, and sensing grooves 203 are provided on the base plate 40 corresponding to the sensing sheets 202, and the sensing grooves 203 are located between the two limit blocks 201. The sensing sheets 202 move with the transmission block 205. When the sensing sheets 202 are close to or abut against the sensing grooves 203, they can trigger a stop signal from the drive device 22 to prevent the transmission block 205 from moving beyond the limit. Preferably, the sensing grooves 203 are groove-shaped photoelectric switches. When the transmission block 205 moves to the extreme position along the track under the action of the drive device 22, the sensing sheets 202 and the sensing grooves 203 generate mutual induction, triggering a signal to control the drive device 22 to stop running.

[0028] In one embodiment, a nuclear radiation detection device is provided, including a control device, wherein the control device can issue instructions to a drive device 22 according to a feedback signal of a detector 31 in a detection chamber 30, and drive a mobile body 200 to move through the drive device 22, adjust the relative position of a radiation adjustment hole 21 and a ray receiving hole 32, thereby adjusting the dose of radiation rays of a sample to be tested that passes through the radiation adjustment hole 21 to reach the detector, so that the radioactivity of the sample is within the measuring range of the detector 31, thereby improving the accuracy of the measurement result, and effectively increasing the measurable application range of the whole device by adjusting the relative positions of different radiation adjustment holes 21 and ray receiving holes 32, and can realize automatic adjustment of the collimation adjustment device 20 according to the feedback signal of the detection chamber 30, so that the total radioactivity concentration of the sample passing through the radiation adjustment hole 21 is within the measuring range of the nuclear radiation detection device, thereby further increasing the convenience and stability of the nuclear radiation detection device, and facilitating improving the measurement accuracy.

[0029] When in use, the mobile body 200 is moved by the driving device 22, the first adjustment hole 211 is axially aligned with the ray receiving hole 32, the total radioactivity concentration of the sample is predicted, and the measurement result is fed back to the control device, the control device determines the corresponding aperture of the radiation adjustment hole 21 required for this detection according to the predicted measurement result, controls the operation of the driving device 22 according to the determination result, adjusts the position of the mobile body 200, makes the required radiation adjustment hole 21 correspond axially with the ray receiving hole 32, and then starts the formal measurement.

[0030] The collimation adjustment device and nuclear radiation detection device provided by the present invention, by setting the collimation adjustment device, the radiation adjustment holes of different apertures of the collimation adjustment device are axially corresponding to the ray receiving hole, and the total radioactivity concentration of the sample passing through the radiation adjustment hole is adjusted, thereby improving the convenience and stability of the nuclear radiation detection device, thereby improving the measurement accuracy and increasing the measurement application range of the nuclear radiation detection device; through the setting of the control device, the collimation adjustment device can be automatically adjusted according to the feedback signal of the detection room, so that the total radioactivity concentration of the sample passing through the radiation adjustment hole is within the range of the nuclear radiation detection device, further increasing the convenience and stability of the nuclear radiation detection device, and facilitating the improvement of the measurement accuracy.

[0031] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A collimation adjustment device (20), characterized in that: The invention comprises a movable body (200) arranged corresponding to a ray receiving hole (32), wherein a plurality of radiation adjustment holes (21) with different apertures are penetrated through the movable body (200), and the movable body (200) is capable of displacement relative to the ray receiving hole (32), so that the radiation adjustment hole (21) and the ray receiving hole (32) are arranged axially correspondingly.

2. The collimation adjustment device (20) according to claim 1, characterized in that: It comprises a guide rail (207), the guide rail (207) is slidably matched with a slider (206), and the mobile body (200) is fixedly arranged relative to the slider (206).

3. The collimation adjustment device (20) according to claim 2, characterized in that: It also comprises a driving device (22), wherein the output end of the driving device (22) is provided with a driving wheel (221), a transmission block (205) is fixedly provided on the slider (206), one end of the transmission block (205) is fixedly provided with a transmission rack (204), and the other end is fixedly arranged with the mobile body (200), and the driving wheel (221) is meshed with the transmission rack (204) for transmission.

4. The collimation adjustment device (20) according to claim 3, characterized in that: The driving device (22) is a servo motor, the driving wheel (221) is a gear, and the driving wheel (221) drives the transmission rack (204) to move linearly by rotating.

5. The collimation adjustment device (20) according to claim 3, characterized in that: The guide rail (207) is provided with limit blocks (201) at both ends along the axial direction, and the limit blocks (201) can stop the transmission block (205) along the axial direction.

6. The collimation adjustment device (20) according to claim 5, characterized in that: It comprises sensing sheets (202) fixedly arranged at both ends of a transmission block (205), and a sensing slot (203) arranged between the limit blocks (201); the sensing sheet (202) and the sensing slot (203) can sense each other to trigger a stop signal of a driving device (22).

7. The collimation adjustment device (20) according to claim 1, characterized in that: The aperture of the radiation adjustment hole (21) is not larger than the aperture of the ray receiving hole (32).

8. The collimation adjustment device (20) according to claim 1, characterized in that: The movable body (200) is composed of a steel-clad lead structure, and three radiation adjustment holes (21) are provided. The radiation adjustment holes (21) are arranged in sequence according to the size of the aperture.

9. A nuclear radiation detection device, characterized in that: The invention comprises a sample chamber (10) and a detection chamber (30), wherein the sample chamber (10) is provided with a collimation hole (12) at one end thereof facing the detection chamber, a detector (31) is provided in the detection chamber (30), and a ray receiving hole (32) is provided at one end of the detector (31) facing the sample chamber (10), and a collimation adjustment device (20) according to any one of claims 1 to 8 is provided between the sample chamber (10) and the detection chamber (30).

10. The nuclear radiation detection device according to claim 9, characterized in that: It comprises a control device, which can issue instructions to a driving device (22) according to a feedback signal from a detection room (30), and adjust the relative position of a radiation adjustment hole (21) and a ray receiving hole (32) through the driving device (22).

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