Low background alpha beta measuring instrument

Abstract

The utility model provides a kind of low background αβ measuring instrument, including base plate and the base and sample chamber sequentially arranged on its upper end, sample chamber includes shell, the side of shell is equipped with mounting groove, mounting groove is slidably set stage, rotation assembly is set in stage, the upper end of stage is equipped with through slot, sample stage is slidably set in through slot, and the execution end of rotation assembly can abut at the lower end of sample stage. The utility model discloses a kind of low background αβ measuring instrument, sets up the sample stage that can be lifted by rotation assembly, sample stage is lifted to the highest, the upper surface of sample stage is flush with the upper surface of stage, now direct the sample disc with sample is placed in the positioning protrusion set in sample stage upper end, simplify the placement process of sample disc, reduce the problem that sample spills due to sample disc inclination when sample disc is placed, improve work efficiency, improve device service life.

Description

Technical Field

[0001] This utility model belongs to the field of radioactive material detection equipment, and in particular relates to a low background αβ measuring instrument. Background Technology

[0002] The low-background αβ measuring instrument is a precision instrument that can be used for sample testing under radiation protection. It is mainly used for measuring the total αβ activity in fields such as drinking water, food, environmental samples, soil, nuclear power plants, medicine and health, agricultural science, isotope production, reactors, and scientific research.

[0003] In the traditional measuring instrument testing process, the sample tray containing the sample needs to be placed flat in the groove on the stage. The placement steps are to hold the edge of the sample tray with one hand and use the other hand to assist in alignment. After vertical placement, gently press to make the bottom fit. Slight deviations during the process will cause the sample tray to tilt, and the sample in the sample tray will spill onto the stage, which will not only affect the subsequent measurement results, but also damage the core components. Utility Model Content

[0004] In view of this, the present invention aims to solve the problem that the placement of the sample tray in the traditional testing instrument depends on the level of the testing personnel. Even a slight error can cause the sample tray to tilt, and the sample in the sample tray to spill onto the stage, which not only affects the subsequent measurement results but also damages the core components.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A low-background αβ measuring instrument includes a base plate and a base and a sample chamber arranged sequentially at its upper end. The sample chamber is used to place the sample to be tested. The sample chamber includes a shell, a stage, a rotating assembly, and a sample stage. A mounting groove is provided on one side of the shell, and the stage is slidably arranged in the mounting groove. The rotating assembly is arranged in the stage. A through groove is provided at the upper end of the stage, and the sample stage is slidably arranged in the through groove. The actuating end of the rotating assembly can abut against the lower end of the sample stage.

[0006] Furthermore, the rotating assembly includes a first rotating structure, a second rotating structure, a handle, a connecting frame, and a torsion spring. The first rotating structure and the second rotating structure are arranged parallel to each other, and their two ends are rotatably connected to the inner walls of the two sides of the platform, respectively. One side of the first rotating structure and the second rotating structure are rotatably connected to the two ends of the connecting frame, respectively. A first groove is provided on one side of the platform, and a handle is provided in the first groove. A connecting protrusion is provided on one side of the handle, and one end of the connecting protrusion passes through the first groove and is fixedly connected to one end of the first rotating structure. A torsion spring is provided around the connecting protrusion, and the two ends of the torsion spring are fixedly connected to one side of the first groove and one side of the handle, respectively.

[0007] Furthermore, the first rotating structure and the second rotating structure are identical. The first rotating structure includes a main shaft, with both ends of the main shaft rotatably connected to the inner walls of both sides of the stage. One end of the main shaft is fixedly connected to one end of the connecting protrusion. Three cams are evenly arranged along the axial direction around the main shaft. One side of the cam in the middle is rotatably connected to one end of the connecting frame. The outermost cam can abut against the lower end of the sample stage.

[0008] Furthermore, the sample stage includes a body, the periphery of which is located within the inner ring of the through groove. Multiple sliders are evenly distributed circumferentially around the periphery of the body, and multiple sliding grooves are evenly distributed circumferentially on the inner sidewall of the through groove. Each slider is slidably connected to the inner ring of a sliding groove. A positioning protrusion is provided at the upper end of the body, which is used to define the relative position of the sample to be tested on the body.

[0009] Furthermore, the low-background αβ measuring instrument also includes an upper lead chamber, a detection unit, and an end cap. Multiple upper lead chambers are arranged axially at the upper end of the sample chamber, and the multiple upper lead chambers are arranged parallel to each other. The detection unit is located at the uppermost upper lead chamber, and the execution end of the detection unit is located inside the multiple upper lead chambers. An end cap is provided at the upper end of the detection unit. The upper end of the outer shell is provided with a through hole, and the execution end of the detection unit can detect the sample on the sample stage through the through hole.

[0010] Furthermore, the lower end of the upper lead chamber is provided with an arc-shaped groove, and the upper end of the upper lead chamber is provided with an arc-shaped protrusion corresponding to the arc-shaped groove. The arc-shaped groove in the upper lead chamber can be fitted around the arc-shaped protrusion in the lower lead chamber.

[0011] Furthermore, multiple positioning posts are evenly distributed on the upper end of the base plate, and multiple positioning holes are provided on the base, sample chamber, upper lead chamber, detection unit and end cap respectively. Each positioning hole is fitted around the periphery of a positioning post, and a fixing nut is threaded to the upper end of each positioning post. The fixing nut is used to limit the relative position of the base, sample chamber, upper lead chamber, detection unit and end cap on the positioning post.

[0012] Compared with the prior art, the low-background αβ measuring instrument of this utility model has the following beneficial effects: (1) The low background αβ measuring instrument described in this utility model is equipped with a sample stage that can be raised and lowered by rotating components. When the sample stage is raised to the highest position, the upper surface of the sample stage is flush with the upper surface of the loading stage. At this time, the sample tray containing the sample needs to be placed in the positioning protrusion set at the upper end of the sample stage, which simplifies the sample tray placement process, reduces the problem of sample spillage caused by the tilt of the sample tray when placing the sample tray, improves work efficiency, and increases the service life of the device.

[0013] (2) The low background αβ measuring instrument described in this utility model sets the rotating handle in the first groove, so that the outer periphery of the stage and the inner ring of the mounting groove fit more closely, so that the execution end of the detection unit is aligned with the center of the sample to be detected, preventing sample offset from causing uneven detection efficiency and improving the accuracy of the detection results. Attached Figure Description

[0014] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a cross-sectional schematic diagram of the overall structure of a low-background αβ measuring instrument according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the sample chamber structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the outer shell structure according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of the stage described in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the assembly structure of the stage and rotating component according to an embodiment of the present utility model; Figure 6 This is a cross-sectional structural diagram of the assembly of the stage and the rotating component according to an embodiment of the present utility model; Figure 7 for Figure 6 A magnified view of part A in the image; Figure 8 This is a schematic diagram of the first rotating structure in an embodiment of the present invention; Figure 9 This is a schematic diagram of the sample stage according to an embodiment of the present invention; Figure 10 This is a cross-sectional structural diagram of the upper lead chamber described in an embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1-Base plate; 11-Positioning post; 12-Fixing nut; 2-Base; 3-Sample chamber; 31-Outer shell; 311-Mounting groove; 312-Through hole; 32-Stage; 321-Through groove; 322-First groove; 323-Slide groove; 33-Rotating assembly; 331-First rotating structure; 3311-Main shaft; 3312-Cam; 332-Second rotating structure; 333-Handle; 334-Connecting frame; 335-Torsion spring; 336-Connecting protrusion; 34-Sample stage; 341-Body; 342-Slider; 343-Positioning protrusion; 4-Upper lead chamber; 41-Arc-shaped groove; 42-Arc-shaped protrusion; 5-Detection unit; 6-End cap. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0017] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] like Figure 1-10As shown, a low-background αβ measuring instrument includes a base plate 1 and a base 2 and a sample chamber 3 arranged sequentially on its upper end. The sample chamber 3 is used to place the sample to be tested. The sample chamber 3 includes a shell 31, a stage 32, a rotating assembly 33, and a sample stage 34. A mounting groove 311 is provided on one side of the shell 31, and the stage 32 is slidably arranged in the mounting groove 311. The rotating assembly 33 is arranged in the stage 32, and a through groove 321 is provided at the upper end of the stage 32. The sample stage 34 is slidably arranged in the through groove 321, and the actuating end of the rotating assembly 33 can abut against the lower end of the sample stage 34. By setting the rotating assembly 33 abutting against the lower end of the sample stage 34, rotating the rotating assembly 33 can make the sample stage 34 move vertically in the through groove 321. When it rises to the limit position, it can be convenient to place the sample to be tested. In this embodiment, the sample to be tested is an assembly of a sample tray and a sample. When the rotating assembly 33 is rotated and the sample stage is lowered to the limit position, the sample to be tested is located in the optimal testing area. To facilitate the installation and placement of the sample to be tested, and to avoid the problem of sample spillage caused by directly placing the sample to be tested into the traditional groove, the upper end of the outer shell 31 is provided with a through hole 312, and the execution end of the detection unit 5 can detect the sample on the sample stage 34 through the through hole 312. The through hole 312 is used to connect the multiple upper lead chambers 4 and the internal space of the outer shell 31, and the upper and lower ends of the through hole 312 correspond to the execution end of the detection unit 4 and the sample stage 34, respectively. That is, the execution end of the detection unit 5 located in the multiple upper lead chambers 4 can detect the sample to be tested placed on the sample stage 34 inside the outer shell 31 through the through hole 312, thereby improving the detection accuracy and preventing detection errors caused by misalignment between the sample to be tested and the execution end of the detection unit 4. The detection unit 5 is the prior art, such as the main probe described in the patent with publication number CN216748110U. Other devices of the prior art can also be selected to meet the requirements of this application, and the staff can adjust them themselves.

[0021] A low-background αβ measuring instrument further includes an upper lead chamber 4, a detection unit 5, and an end cap 6. Multiple upper lead chambers 4 are axially arranged at the upper end of the sample chamber 3, and these upper lead chambers 4 are arranged parallel to each other. The detection unit 5 is located at the uppermost upper lead chamber 4, and the execution end of the detection unit 5 is located inside the multiple upper lead chambers 4. The end cap 6 is located at the upper end of the detection unit 5. By providing detachable upper lead chambers 4, the device is made easier to transport, reducing the difficulty of moving the device and improving its adaptability. The lower end of the upper lead chamber 4 is provided with an arc-shaped groove 41, and the upper end of the upper lead chamber 4 is provided with an arc-shaped protrusion 42 corresponding to the arc-shaped groove 41. The arc-shaped groove 41 of the upper lead chamber 4 can fit around the arc-shaped protrusion 42 of the lower upper lead chamber 4. By providing corresponding arc-shaped grooves 41 and arc-shaped protrusions 42 at the upper and lower ends of the upper lead chamber 4 respectively, the connection between two adjacent upper lead chambers 4 is made tighter, effectively blocking external radiation interference.

[0022] Multiple positioning posts 11 are evenly distributed on the upper end of the base plate 1. The base 2, sample chamber 3, upper lead chamber 4, detection unit 5, and end cap 6 are each provided with multiple positioning holes, and each positioning hole is fitted around the periphery of a positioning post 11. A fixing nut 12 is threaded to the upper end of each positioning post 11. The fixing nut 12 is used to limit the relative positions of the base 2, sample chamber 3, upper lead chamber 4, detection unit 5, and end cap 6 on the positioning post 11. By setting positioning posts 11 on the base plate and setting corresponding positioning holes in each of the above-mentioned device accessories, the installation of the device can be made more convenient, the docking between various parts can be more accurate, and the center alignment accuracy between the detection probe and the sample being tested can be improved. The base 2, upper lead chamber 4, and end cap 6 are all used to shield the natural background radiation in the environment, reduce the influence of external radiation on the detection results, and improve the accuracy of the detection results.

[0023] like Figure 5-8 As shown, the rotating assembly 33 includes a first rotating structure 331, a second rotating structure 332, a handle 333, a connecting frame 334, and a torsion spring 335. The first rotating structure 331 and the second rotating structure 332 are arranged parallel to each other, and their two ends are rotatably connected to the inner walls of both sides of the platform 32. One side of the first rotating structure 331 and the second rotating structure 332 are rotatably connected to both ends of the connecting frame 334. The connecting frame 334 connects the first rotating structure 331 and the second rotating structure 332 to each other, achieving synchronous movement. One side of the platform 32 is provided with... There is a first groove 322, and a rotating handle 333 is provided in the first groove 322. A connecting protrusion 336 is provided on one side of the rotating handle 333, and one end of the connecting protrusion 336 passes through the first groove 322 and is fixedly connected to one end of the first rotating structure 331. A torsion spring 335 is provided around the connecting protrusion 336, and the two ends of the torsion spring 335 are respectively fixedly connected to one side of the first groove 322 and one side of the rotating handle 333. By providing the rotating handle 333 in the first groove 322, the stage 32 can fit more closely with the mounting groove 311. By providing the torsion spring 335, the initial position of the cam 3312 on the rotating shaft 3311 can be guaranteed.

[0024] The first rotating structure 331 and the second rotating structure 332 have the same structure. The first rotating structure 331 includes a main shaft 3311. The two ends of the main shaft 3311 are rotatably connected to the inner walls of the two sides of the stage 32, and one end of the main shaft 3311 is fixedly connected to one end of the connecting protrusion 336. Three cams 3312 are evenly arranged axially around the periphery of the main shaft 3311. One side of the cam 3312 in the middle is rotatably connected to one end of the connecting frame 334. The outermost cam 3312 can abut against the lower end of the sample stage 34. The cams 3312 in the middle of the first rotating structure 331 and the second rotating structure 332 are connected to each other, so that the first rotating structure 331 and the second rotating structure 332 can move synchronously. At this time, the cams 3312 on both sides are located below a sample stage 34, and can abut against the corresponding sample stage 34 when rotating, driving the sample stage 34 to rise and fall, which facilitates the picking and placing of samples.

[0025] The sample stage 34 includes a body 341. The periphery of the body 341 is located within the inner ring of the through groove 321. Multiple sliders 342 are evenly distributed circumferentially around the periphery of the body 341. Multiple sliding grooves 323 are evenly distributed circumferentially on the inner sidewall of the through groove 321. Each slider 342 is slidably connected to the inner ring of a sliding groove 323. A positioning protrusion 343 is provided at the upper end of the body 341. The positioning protrusion 343 is used to limit the relative position of the sample to be tested on the body 341. The sample stage 34, through the cooperation of the peripheral sliders 342 with the sliding grooves 323 in the through groove 321 of the stage 32, ensures that the sample stage 34 can only slide stably along the axial direction and cannot be offset circumferentially, thereby realizing the adjustment of the height of the sample stage 34. When the sample to be tested is placed on the body 341 of the sample stage 34, the position of the sample is limited by the positioning protrusion 343 at the upper end of the body 341, avoiding sample offset during the test and improving the test accuracy.

[0026] The working process of a low-background αβ measuring instrument: Preliminary preparations and equipment assembly During equipment assembly, the base 2, sample chamber 3, multiple upper lead chambers 4, detection unit 5, and end cap 6 are sequentially fitted onto the positioning post 11 on the base plate 1. The positioning holes of each component cooperate with the positioning post 11 to achieve precise positioning. Finally, the fixing nut 12 is used to lock the assembly, completing the overall assembly. The multiple upper lead chambers 4 are nested and cooperated with the arc-shaped protrusion 42 and the arc-shaped groove 41 to form a sealed multi-layer shielding structure, which can effectively reduce the interference of the external environment on the detection and ensure low background detection conditions.

[0027] Sample placement and positioning Pull out the stage 32 inside the mounting slot 311 of the outer shell 31 of the sample chamber 3, and adjust the rotating component 33 to adjust the height of the sample stage 34. During operation, turn the handle 333 in the first groove 322 of the stage 32. The handle 333 drives the main shaft 3311 of the first rotating structure 331 to rotate through the connecting protrusion 336. The first rotating structure 331 drives the second rotating structure 332 to rotate in the same direction through the connecting bracket 334. The cams 3312 on the main shafts 3311 of both rotate accordingly. The outermost cam 3312 abuts against the lower end of the sample stage 34 and pushes it to slide up and down along the slide groove 323. The sample stage 34 is moved by the outer slider 34. 2. The slide groove 323 in the through groove 321 of the stage 32 cooperates with the sample stage 34 to ensure that the sample stage 34 can only slide stably along the axial direction and cannot be offset in the circumferential direction, so as to realize the height adjustment of the sample stage 34. The sample to be tested is placed on the body 341 of the sample stage 34. The positioning protrusion 343 at the upper end of the body 341 limits the position of the sample and avoids the sample offset during the test. Finally, the rotating handle 333 is released, and the torsion spring 335 around the protrusion 336 is reset, which drives the rotating handle 333 and the rotating structure to return to the initial position. The sample stage 34 stably falls back to the lowest position. At this time, the sample to be tested is located in the space formed by the sample stage 34 and the through groove 321.

[0028] Detection execution Push the adjusted sample stage 32 back into the mounting slot 311 of the sample chamber 3, close the sample chamber 3 to ensure internal sealing, and start the detection unit 5. Its execution end penetrates the shielding layer through the through hole 312 at the upper end of the outer shell 31 of the sample chamber 3 to perform αβ ray detection on the sample on the sample stage 34. The shielding structure formed by the multi-layer lead chamber 4 continuously blocks external ray interference, ensuring the accuracy of the detection data. During the detection process, the sample remains stationary to avoid positional changes affecting the detection results.

[0029] Reset after detection After the test is completed, close the test unit 5, pull out the stage 32, turn the handle 333 to raise the sample stage 34, take out the tested sample, release the handle 333 to reset the instrument and clean the instrument to prepare for the next test.

[0030] The control method in this embodiment is controlled by a controller. The controller circuit can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, this document is mainly used to protect mechanical devices, and the control method and circuit connection will not be explained in detail here.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-background αβ measuring instrument, characterized in that: The sample chamber (3) includes a base plate (1) and a base (2) and a sample chamber (3) arranged sequentially on its upper end. The sample chamber (3) is used to place the sample to be tested. The sample chamber (3) includes a shell (31), a stage (32), a rotating component (33) and a sample stage (34). A mounting groove (311) is provided on one side of the shell (31). The stage (32) is slidably arranged in the mounting groove (311). The rotating component (33) is arranged in the stage (32). A through groove (321) is provided at the upper end of the stage (32). The sample stage (34) is slidably arranged in the through groove (321). The actuating end of the rotating component (33) can abut against the lower end of the sample stage (34).

2. The low-background αβ measuring instrument according to claim 1, characterized in that: The rotating assembly (33) includes a first rotating structure (331), a second rotating structure (332), a handle (333), a connecting frame (334), and a torsion spring (335). The first rotating structure (331) and the second rotating structure (332) are arranged parallel to each other, and the two ends of the first rotating structure (331) and the second rotating structure (332) are respectively rotatably connected to the inner walls of the two sides of the platform (32). One side of the first rotating structure (331) and the second rotating structure (332) are respectively rotatably connected to the two ends of the connecting frame (334). The platform (32) has a first groove (322) on one side, a rotating handle (333) is provided in the first groove (322), a connecting protrusion (336) is provided on one side of the rotating handle (333), and one end of the connecting protrusion (336) passes through the first groove (322) and is fixedly connected to one end of the first rotating structure (331). A torsion spring (335) is provided around the connecting protrusion (336), and the two ends of the torsion spring (335) are respectively fixedly connected to one side of the first groove (322) and one side of the rotating handle (333).

3. A low-background αβ measuring instrument according to claim 2, characterized in that: The first rotating structure (331) and the second rotating structure (332) have the same structure. The first rotating structure (331) includes a main shaft (3311). The two ends of the main shaft (3311) are rotatably connected to the inner walls of the two sides of the stage (32). One end of the main shaft (3311) is fixedly connected to one end of the connecting protrusion (336). Three cams (3312) are evenly arranged along the axial direction on the periphery of the main shaft (3311). One side of the cam (3312) in the middle is rotatably connected to one end of the connecting frame (334). The periphery of the outermost cam (3312) can abut against the lower end of the sample stage (34).

4. A low-background αβ measuring instrument according to claim 1, characterized in that: The sample stage (34) includes a body (341), the periphery of which is located in the inner circle of the through groove (321). Multiple sliders (342) are evenly arranged around the periphery of the body (341). Multiple grooves (323) are evenly arranged around the inner sidewall of the through groove (321). Each slider (342) is slidably connected to the inner circle of a groove (323). A positioning protrusion (343) is provided at the upper end of the body (341). The positioning protrusion (343) is used to define the relative position of the sample to be tested on the body (341).

5. A low-background αβ measuring instrument according to claim 1, characterized in that: It also includes an upper lead chamber (4), a detection unit (5) and an end cap (6). Multiple upper lead chambers (4) are arranged along the axial direction at the upper end of the sample chamber (3), and the multiple upper lead chambers (4) are arranged in parallel to each other. The detection unit (5) is arranged at the upper end of the upper lead chamber (4), and the execution end of the detection unit (5) is located inside the multiple upper lead chambers (4). The end cap (6) is arranged at the upper end of the detection unit (5). The upper end of the outer shell (31) is provided with a through hole (312), and the execution end of the detection unit (5) can detect the sample on the sample stage (34) through the through hole (312).

6. A low-background αβ measuring instrument according to claim 5, characterized in that: The lower end of the upper lead chamber (4) is provided with an arc-shaped groove (41), and the upper end of the upper lead chamber (4) is provided with an arc-shaped protrusion (42) corresponding to the arc-shaped groove (41). The arc-shaped groove (41) of the upper lead chamber (4) can be fitted around the arc-shaped protrusion (42) of the lower lead chamber (4).

7. A low-background αβ measuring instrument according to claim 1, characterized in that: Multiple positioning posts (11) are evenly arranged on the upper end of the base plate (1). Multiple positioning holes are provided on the base (2), sample chamber (3), upper lead chamber (4), detection unit (5) and end cap (6), and each positioning hole is fitted around a positioning post (11). A fixing nut (12) is threaded to the upper end of each positioning post (11). The fixing nut (12) is used to limit the relative position of the base (2), sample chamber (3), upper lead chamber (4), detection unit (5) and end cap (6) on the positioning post (11).

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