Radioactivity activity meter

Abstract

The invention provides a radioactive activity meter which comprises a shell, the shell is of a composite structure, a shielding cylinder is detachably arranged in the shell, a containing cavity used for containing a glass container of radioactive medicine is formed in the shielding cylinder, a positioning clamping piece is arranged on the upper portion of the shielding cylinder, and a fixing frame is arranged on the outer side of the shell. An installation assembly is arranged on the fixing frame and comprises a connecting piece matched with the positioning clamping piece. According to the invention, rapid and efficient installation and positioning operation of the shielding cylinder can be realized through cooperation of the installation assembly and the positioning clamping piece, and efficient detection operation of particle activity of radiopharmaceuticals is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of activity meter technology, and more specifically to a radioactive activity meter. Background Technology

[0002] An activity meter is an instrument specifically designed to measure the activity of radionuclides. It is an important tool in the field of radiation medicine and protection. Based on the characteristic that the activity of a radionuclide is proportional to the specific type of radiation released during its decay, it indirectly determines the activity of the radioactive material by capturing and measuring this radiation energy through a detector. An activity meter typically consists of a well-type ionization chamber, a current measurement system, and a radioactivity display unit. The ionization chamber is the core component of the activity meter. It utilizes the gamma rays produced by the decay of a radionuclide to ionize the working gas, forming a current proportional to the activity of the radionuclide. After being processed by the measurement system, this current can be directly read from the display unit in units such as Bq (Bécler) or Ci (Curie).

[0003] Currently, activity meters manufactured using the well-type ionization chamber measurement principle often employ a single, integrated internal structure. While this design ensures stability and measurement accuracy to some extent, it also introduces several significant technical problems. Among these, the most prominent are the following issues present in traditional activity meter products: The installation process is cumbersome and inefficient: traditional shielding cylinders are mostly fixed in steps with multiple sets of bolts. During installation, the holes need to be aligned repeatedly, and a single installation takes more than 10 minutes, which cannot meet the efficiency requirements of batch testing. Insufficient positioning accuracy affects test results: The lack of a guiding structure during installation makes the shielding cylinder prone to displacement, and the positioning error often exceeds 2mm, causing the relative position of the radiopharmaceutical and the detection probe to deviate, thus increasing the measurement error. Summary of the Invention

[0004] In view of this, the present invention provides a radioactivity meter that can quickly and efficiently disassemble and assemble glass containers of radiopharmaceuticals through a detachable shielding cylinder structure, solving the problems of cumbersome and inefficient traditional shielding cylinder installation processes, greatly improving positioning accuracy, and ensuring the accuracy of test results.

[0005] To address the aforementioned technical problems, this invention provides a radioactivity meter, comprising a housing with a composite structure. A shielding cylinder is detachably installed inside the housing, and the shielding cylinder contains a cavity for holding a glass container of radiopharmaceutical. A positioning latch is located at the top of the shielding cylinder, and a fixing frame is located on the outside of the housing. An installation assembly is mounted on the fixing frame, including a connector adapted to the positioning latch. This invention enables rapid and efficient installation and positioning of the shielding cylinder through the cooperation of the installation assembly and the positioning latch, significantly improving the efficiency of detecting the particle activity of radiopharmaceuticals.

[0006] The positioning clip includes a clip plate located on the upper part of the shielding cylinder, and the clip plate has pin holes. This invention enables rapid installation and fixing of the shielding cylinder and the mounting components through the clip plate and pin holes.

[0007] The connector includes a horizontal plate mounted on a fixed frame, with light removal holes on the horizontal plate. The connector also includes a mounting plate located at the lower part of the horizontal plate, and the mounting plate and the locking plate are detachably connected by fasteners. This invention enables the rapid installation and fixing of the positioning locking component on the shielding cylinder using fasteners.

[0008] A guide plate is also provided at the end of the horizontal plate, and a guide groove is formed on the guide plate, which is adapted to the clamping plate. This invention can achieve rapid positioning and efficient guided installation of the shielding cylinder under the clamping plate through the cooperation of the guide groove and the clamping plate.

[0009] The upper part of the fixed frame is equipped with a lifting and rotating platform, and a horizontal plate is set on the lifting and rotating platform. This invention can conveniently and efficiently adjust the height and position of the fixed frame through the lifting and rotating platform, thereby realizing the rapid and efficient installation of the shielding cylinder at the bottom of the fixed frame.

[0010] The lifting and rotating platform includes a telescopic push rod mounted on a fixed frame. A rotating component is located at the output end of the telescopic push rod, and the output shaft of the rotating component is located at the lower part of the horizontal plate. This invention allows the horizontal plate to rotate along with the output shaft of the rotating component. Simultaneously, the extension and retraction of the output rod of the telescopic push rod facilitates convenient and quick adjustment of the horizontal plate's height, thereby enabling convenient and quick adjustment of the height and position of the shielding cylinder at the lower part of the horizontal plate. The telescopic push rod is either electric or hydraulic, and the rotating component is a servo motor. This invention allows for the adjustment of the position of the horizontal plate and the shielding cylinder beneath it by rotating the servo motor's output shaft 180 degrees.

[0011] The axis of the horizontal plate coincides with the axis of the servo motor.

[0012] The fasteners are bolts and nuts. This facilitates quick installation and removal of the shielding cylinder. The outer shell consists of a lead-tungsten composite layer and a pure tungsten protective layer arranged sequentially from the outside to the inside. This not only ensures good protection but also provides high radiation shielding performance.

[0013] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. Significantly improves installation efficiency: This invention can greatly shorten the single installation time of the shielding cylinder and greatly improve installation efficiency through the combination structure of guide groove + snap-fit ​​+ fastener, making it suitable for batch testing scenarios.

[0014] 2. Ensuring positioning accuracy: This invention can greatly reduce the positioning error of the shielding cylinder by adapting the guide groove to the axis of the horizontal plate-servo motor, effectively avoiding the positional deviation between the detection probe and the radiopharmaceutical, and greatly reducing the measurement error.

[0015] 3. Achieve full-dimensional radiation protection: This invention can greatly reduce the radiation dose on the outside of the equipment and completely eliminate operational risks through a double-layer shielding structure of lead-tungsten composite layer + pure tungsten protective layer, combined with lead-boron polyethylene shielding cylinder.

[0016] 4. Enhanced scene adaptability: This invention can be adapted to detection probes of different models and installation positions through the height adjustment of the electric push rod and the angle adjustment of the servo motor, and the applicable scenarios are expanded to diverse environments such as operating rooms and mobile detection vehicles.

[0017] 5. Simplified maintenance process: The present invention can greatly shorten the disassembly time of the shielding cylinder through the detachable snap-fit ​​structure, and greatly reduce the wear rate of the components, thus significantly reducing the cost of use and maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the radioactivity meter of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a front view of the radioactivity meter of the present invention; Figure 4 This is an isometric side view of the radioactivity meter of the present invention; Figure 5 This is a schematic diagram of the internal structure of the outer shell of the radioactivity meter of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 100, outer shell; 110, lead-tungsten composite layer; 120, pure tungsten protective layer; 200, shielding cylinder; 300, positioning clip; 310, clamping plate; 311, pin hole; 400, fixing frame; 500, mounting assembly; 510, connector; 511, horizontal plate; 512, mounting plate; 520, fastener; 521, bolt; 522, nut; 530, guide plate; 531, guide groove; 600, lifting and rotating platform; 610, telescopic push rod; 620, rotating component. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of the present invention. Figures 1-5 The technical solutions of the embodiments of the present invention will be clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0021] like Figures 1-5 As shown: This embodiment provides a radioactivity meter, including a housing 100. The housing 100 is a composite structure, and a shielding cylinder 200 is detachably installed inside the housing 100. The shielding cylinder 200 is made of lead-boron polyethylene material through a molding process. This material has both shielding and lightweight characteristics. Its internal placement cavity is adapted to the shape of the glass container of radiopharmaceutical, and can stably accommodate the container. The shielding cylinder 200 has a placement cavity for accommodating the glass container of radiopharmaceutical. A positioning clip 300 is provided on the upper part of the shielding cylinder 200. The shielding cylinder 200 achieves close-range shielding of radiopharmaceutical, and the positioning clip 300 ensures installation fit. A fixing frame 400 is provided on the outside of the housing 100. An installation component 500 is provided on the fixing frame 400. The installation component 500 includes a connector 510 adapted to the positioning clip 300. The present invention enables rapid and efficient installation and positioning of the shielding cylinder 200 through the cooperation of the installation component 500 and the positioning card connector 300, which greatly improves the efficiency of detecting the particle activity of radiopharmaceuticals.

[0022] According to one embodiment of the present invention, such as Figures 1-4 As shown, the positioning clip 300 includes a clip plate 310 disposed on the upper part of the shielding cylinder 200. The clip plate 310 is made of aluminum alloy, which is high in strength and lightweight. A pin hole 311 is opened in the middle of the clip plate 310 to fit with the fastener 520 of the mounting assembly 500, so as to achieve quick fixation. The clip plate 310 has a pin hole 311. The present invention can achieve quick installation and fixation of the shielding cylinder 200 and the mounting assembly 500 through the function of the clip plate 310 and the pin hole 311.

[0023] According to another embodiment of the invention, such as Figure 1 and Figure 2 As shown, the connector 510 includes a horizontal plate 511 mounted on the fixing frame 400, with light-removal holes on the horizontal plate 511. The connector 510 also includes a mounting plate 512 located at the lower part of the horizontal plate 511. The mounting plate 512 and the clamping plate 310 are detachably connected by fasteners 520. The horizontal plate 511 is made of aluminum alloy and has sufficient load-bearing strength. The mounting plate 512 is fixed to the lower part of the horizontal plate 511, and its holes are aligned with the pin holes 311 of the clamping plate 310. The detachable connection is achieved by stainless steel bolts 521 and nuts 522. This invention enables the rapid installation and fixing of the positioning clamping component 300 on the shielding cylinder 200 using fasteners 520.

[0024] According to another embodiment of the invention, such as Figure 1 and Figure 3 As shown, a guide plate 530 is also provided at the end of the horizontal plate 511. The guide plate 530 is made of engineering plastic, and the guide groove 531 on the guide plate 530 is precisely matched with the shape of the clamping plate 310. During installation, it can guide the clamping plate 310 into place quickly, avoiding the tedious operation of aligning holes. The guide plate 530 has a guide groove 531 that is adapted to the clamping plate 310. This invention can achieve rapid positioning and efficient guiding installation of the shielding cylinder 200 under the clamping plate 310 through the cooperation of the guide groove 531 and the clamping plate 310.

[0025] According to another embodiment of the invention, such as Figure 1 and Figure 4 As shown, a lifting and rotating platform 600 is provided on the upper part of the fixed frame 400, and a horizontal plate 511 is provided on the lifting and rotating platform 600. The present invention can realize convenient and efficient adjustment of the height and position of the fixed frame 400 through the lifting and rotating platform 600, thereby realizing the fast and efficient installation of the shielding cylinder 200 at the lower part of the fixed frame 400.

[0026] The lifting and rotating platform 600 includes a telescopic push rod 610 mounted on a fixed frame 400. A rotating element 620 is provided at the output rod end of the telescopic push rod 610, and the output shaft end of the rotating element 620 is located at the lower part of the horizontal plate 511. This invention allows the horizontal plate 511 to rotate along with the output shaft of the rotating element 620. Simultaneously, the extension and retraction of the output rod of the telescopic push rod 610 facilitates convenient and quick adjustment of the height of the horizontal plate 511, thereby enabling convenient and quick adjustment of the height and position of the shielding cylinder 200 below the horizontal plate 511. The telescopic push rod 610 is either an electric or hydraulic push rod. The extension stroke of the output rod of the telescopic push rod 610 is adjustable, enabling precise control of the height of the horizontal plate 511. The rotating component 620 is a servo motor. The servo motor can drive the horizontal plate 511 and the lower shielding cylinder 200 to rotate stably, adapting to the position requirements of different detection probes. This invention can adjust the position of the horizontal plate 511 and the lower shielding cylinder 200 by rotating the output shaft of the servo motor 180 degrees.

[0027] The axis of the horizontal plate 511 coincides with the axis of the servo motor.

[0028] Fasteners 520 consist of bolts 521 and nuts 522. This facilitates quick installation and removal of the shielding cylinder 200. According to another embodiment of the invention, such as Figure 1 and Figure 5 As shown, the outer casing 100 includes a lead-tungsten composite layer 110 and a pure tungsten protective layer 120 arranged sequentially from the outside to the inside. The outer casing 100 has a double-layer shielding structure, providing comprehensive radiation protection: the lead-tungsten composite layer 110 is formed from a lead-tungsten alloy using a die-casting process, a material that effectively blocks radiation leakage; the pure tungsten protective layer 120 is made from high-purity tungsten plate, with uniform thickness and a smooth surface, further enhancing the shielding effect against high-energy radiation while preventing radioactive contamination of the inner wall of the outer casing 100; the connection method: the lead-tungsten composite layer 110 and the pure tungsten protective layer 120 are fixed by bolts 521, with lead rubber sealing gaskets filling the connection points to ensure the continuity of shielding. This not only ensures good protective function but also provides high radiation protection performance.

[0029] The following example, using a nuclear medicine department as the testing site, with I125 as the radioactive particle to be detected and a dedicated low-energy gamma-ray probe as the detection probe, will be used to explain in detail how to use an activity meter.

[0030] Place the outer casing 100 on the department's testing table and turn on the power to the lifting and rotating platform 600; adjust the electric push rod to make the height of the horizontal plate 511 50cm, and rotate the servo motor until the guide plate 530 faces forward; push the clamping plate 310 of the built-in shielding cylinder 200 into the guide groove 531 and fix it with stainless steel bolts 521; adjust the electric push rod to lower the height of the horizontal plate 511 to 30cm, and rotate the servo motor to 90° to send the built-in shielding cylinder 200 into the outer casing 100 and align it with the detection probe; place the glass container containing I125 particles in the container, start the detection, and after 1 minute, the activity value is displayed as 0.792mCi, with an error of -1%.

[0031] After the test is completed, adjust the lifting and rotating platform 600 to move out the built-in shielding cylinder 200, remove the bolt 521 to take it out for cleaning. The whole process takes less than 5 minutes. During the operation, the radiation monitoring instrument shows that the dose value is qualified and fully complies with the safety standards.

[0032] Working principle and usage of this invention: First, it should be clarified that the activity meter involved in this invention is mainly used to measure the activity of radionuclides. This invention takes the measurement of a particle activity meter as an example to explain its working principle and usage method in detail. The working principle is as follows: The height and angle of the installation component 500 are adjusted by the lifting and rotating platform 600, and the guide groove 531 of the guide plate 530 is used to achieve rapid positioning of the built-in shielding cylinder 200. The fasteners 520 are used to complete the fixation. The composite structure shell 100 and the built-in shielding cylinder 200 form a double-layer shield to avoid radiation leakage. The radiation of the radiopharmaceutical passes through the weak area of ​​the built-in shielding cylinder 200, and the detection window interacts with the probe of the activity meter to complete the activity measurement.

[0033] The usage method is as follows: Equipment preparation: Place the outer casing 100 on a horizontal mounting base, turn on the power of the lifting and rotating platform 600, and confirm that the electric push rod and servo motor are working properly; Installation guide: Operate the electric push rod to adjust the height of the horizontal plate 511, rotate the servo motor to make the guide plate 530 face the operator, and push the clamping plate 310 of the built-in shielding cylinder 200 into the guide groove 531 of the guide plate 530 until the clamping plate 310 is in contact with the mounting plate 512. Fixing the shielding cylinder 200: Pass the stainless steel bolt 521 through the pin hole 311 of the mounting plate 512 and the clamping plate 310, and tighten the nut 522 to complete the fixing of the built-in shielding cylinder 200; Position adjustment: Adjust the height of the horizontal plate 511 by electric push rod, and adjust the angle by rotating servo motor to send the built-in shielding cylinder 200 into the housing 100 so that the placement cavity is aligned with the position of the detection probe; Placement of the drug: Open the sealed cover of the built-in shielding cylinder 200, place the glass container containing the radiopharmaceutical into the placement chamber, and close the sealed cover; Start detection: Press the detection button on the activity meter to complete the activity measurement of radioactive particles; Disassembly and maintenance: After the inspection is completed, adjust the lifting and rotating platform 600 to move the built-in shielding cylinder 200 out of the outer shell 100, remove the bolts 521 and nuts 522, and take out the built-in shielding cylinder 200 for cleaning and maintenance.

[0034] This invention enables rapid and efficient assembly and disassembly of glass containers for radiopharmaceuticals through a detachable shielding cylinder 200 structure. It solves the problems of cumbersome and inefficient installation processes of traditional shielding cylinders 200, greatly improves positioning accuracy, and ensures the accuracy of test results.

[0035] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention according to the specific circumstances.

[0036] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A radioactivity meter comprising a housing (100), characterized in that: The shell (100) is a composite structure, the inside of the shell (100) is detachably provided with a shielding cylinder (200), a placing cavity for accommodating a glass container of a radioactive drug is formed in the shielding cylinder (200), the upper part of the shielding cylinder (200) is provided with a positioning clamping piece (300), a fixing frame (400) is arranged outside the shell (100), the fixing frame (400) is provided with a mounting assembly (500), and the mounting assembly (500) comprises a connecting piece (510) matched with the positioning clamping piece (300).

2. The radioactivity meter of claim 1, wherein: The positioning clamping piece (300) comprises a clamping plate (310) arranged on the upper part of the shielding cylinder (200), and a pin hole (311) is formed in the clamping plate (310).

3. The radioactivity meter of claim 2, wherein: The connecting piece (510) comprises a cross plate (511) arranged on the fixing frame (400), the connecting piece (510) comprises a mounting plate (512) arranged on the lower part of the cross plate (511), and the mounting plate (512) and the clamping plate (310) are detachably connected through a fastener (520).

4. The radioactivity meter of claim 3, wherein: The end of the cross plate (511) is further provided with a guide plate (530), the guide plate (530) is provided with a guide groove (531), and the guide groove (531) is matched with the clamping plate (310).

5. The radioactivity meter of claim 4, wherein: The upper part of the fixing frame (400) is provided with a lifting rotary platform (600), and the cross plate (511) is arranged on the lifting rotary platform (600).

6. The radioactivity meter of claim 5, wherein: The lifting rotary platform (600) comprises a telescopic push rod (610) arranged on the fixing frame (400), and the output rod end of the telescopic push rod (610) is provided with a rotating piece (620), and the output shaft end of the rotating piece (620) is arranged on the lower part of the cross plate (511).

7. The radioactivity meter of claim 6, wherein: The telescopic push rod (610) is an electric push rod or a hydraulic push rod, and the rotating piece (620) is a rudder.

8. The radioactivity meter of claim 7, wherein: The axis of the cross plate (511) coincides with the axis of the rudder.

9. The radioactivity meter of claim 3, wherein: The fastener (520) is a bolt (521) and a nut (522).

10. The radioactivity meter of claim 1, wherein: The shell (100) comprises a lead-tungsten composite layer (110) and a pure tungsten protection layer (120) arranged in sequence from outside to inside.

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