Gamma ray irradiation device for nuclide identification instrument calibration

Abstract

The invention discloses a gamma ray irradiation device for nuclide identification instrument calibration, which is characterized by comprising a radioactive source shielding container, a radioactive source selection device, a gas path opening and closing device, a pneumatic transmission gas inlet pipeline and a radioactive source pneumatic transmission channel, wherein the radioactive source selection device comprises a radioactive source turntable, a control motor, a turntable original point and a radioactive source bearing structure, and an output shaft of the control motor is fixedly connected with the end part of a central shaft of the radioactive source turntable; the radioactive source turntable is provided with a plurality of source positions, the radioactive source bearing structures are arranged in the source positions and are used for placing radioactive sources, and the turntable original point is used for calibrating and feeding back an initial position; the radioactive source shielding container is sleeved outside the radioactive source turntable and is used for shielding radioactive rays generated by a radioactive source in the radioactive source turntable; and the pneumatic transmission air inlet pipeline is positioned below the radioactive source turntable and is communicated with the radioactive source turntable.

Description

Technical Field

[0001] This invention relates to the field of gamma-ray irradiation, and more specifically to a gamma-ray irradiation device for calibrating a nuclide identifier. Background Technology

[0002] Nuclear technology is increasingly becoming a key pillar of industrial production, public safety, and daily life. However, with the increase in nuclear energy use, the risk of nuclear accidents also rises. Therefore, nuclear safety has become a focus of public concern, and research on monitoring and identification technologies for nuclear materials has become a hot topic in scientific research. Portable radionuclide identifiers play a crucial role in detecting radioactive materials. They can quickly locate and characterize radioactive materials, providing immediate information for emergency response, thereby assisting commanders in making accurate decisions and significantly improving the efficiency of accident handling. Their applications cover nuclear laboratories, nuclear medicine, counter-terrorism, customs inspection, mineral resource development, scrap metal recycling, and radioactivity detection in building materials, among other areas.

[0003] Portable radionuclide identifiers require regular calibration to ensure long-term performance stability. According to the "Calibration Specification for Handheld Radiation Monitors Used for Detection and Identification of Radionuclides" (JJF1687-2018), the radionuclide identification rate of the identifier must be measured, including measurements of single radionuclide identification rates and mixed radionuclide identification rates. The calibration specification recommends the following gamma-ray reference source nuclide for radionuclide identification measurements: 241 Am、 60 Co、 137 Cs、 226 Ra、 232 Th、 133 Ba, etc., activity range 10 4 ~10 7 Bq. Radioactive sources in this activity range are classified as Class V or exempt, posing minimal risk to laboratory personnel, but long-term exposure still carries some risk.

[0004] Currently, there is no dedicated gamma-ray irradiation device for calibrating radionuclide identifiers. Typically, personnel must manually handle the radiation source. Although the radiation sources used are Class V or exempt, posing minimal risk to personnel, long-term exposure still carries a certain risk. Therefore, this invention proposes a gamma-ray irradiation device for radionuclide identifier calibration. This device avoids close contact between personnel and radioactive nuclides, reducing the working dose for personnel. Summary of the Invention

[0005] To achieve the above and other related objectives, this invention discloses a gamma-ray irradiation device for calibrating a radionuclide identifier, comprising a radiation source shielding container, a radiation source selection device, a gas path opening and closing device, a pneumatic transmission inlet pipe, and a radiation source pneumatic transmission channel, wherein: The radiation source selection device includes a radiation source turntable, a control motor, a turntable origin, a radiation source support structure, and a central shaft. The central shaft is located at the center of the radiation source turntable and is fixedly connected to it. The central shaft is used to drive the radiation source turntable to rotate. The output shaft of the control motor is fixedly connected to the end of the central shaft. The radiation source turntable has multiple source positions, and the radiation source support structure is placed in each source position. The radiation source support structure is used to place the radiation source, and the turntable origin is used for calibration and feedback of the initial position. The radiation source shielding container is fitted over the radiation source turntable and is used to shield the radioactive rays generated by the radiation source. The pneumatic transmission air intake pipe is located below the radioactive source turntable, and the pneumatic transmission air intake pipe is connected to the source position of the radioactive source turntable; The pneumatic transmission channel for the radioactive source is located above the radioactive source turntable, and the pneumatic transmission channel for the radioactive source is connected to the source position of the radioactive source turntable. When high-pressure gas is introduced into the pneumatic transmission inlet pipe, the gas in the pneumatic transmission inlet pipe pushes the radiation source carrier structure in the radiation source turntable upward to the top along the radiation source pneumatic transmission channel, so as to facilitate the irradiation of the radiation source. The gas path opening and closing device includes a gas path opening and closing electric push cylinder, an electric push cylinder position sensor, a gas path opening and closing push cylinder gripper, and a lifting pipe. There are two lifting pipes, located in the pneumatic transmission channel of the radiation source and the pneumatic transmission inlet pipe, respectively. The two lifting pipes are slidably connected to the pneumatic transmission channel of the radiation source and the pneumatic transmission inlet pipe, respectively, so that the lifting pipe can slide inside the pneumatic transmission channel of the radiation source or the pneumatic transmission inlet pipe. The end of the lifting pipe near the radiation source turntable can abut against the radiation source turntable. The output end of the pneumatic circuit opening and closing electric push cylinder is rotatably equipped with two symmetrically arranged connecting rods. Two pneumatic circuit opening and closing push cylinder grippers are provided. The end of each connecting rod away from the pneumatic circuit opening and closing electric push cylinder is rotatably connected to one pneumatic circuit opening and closing push cylinder gripper. The two pneumatic circuit opening and closing push cylinder grippers are respectively inserted into two lifting tubes. When the pneumatic circuit opening and closing electric push cylinder is opened, it pushes the connecting rods, and the pneumatic circuit opening and closing push cylinder grippers move the lifting tubes away from the radiation source turntable, allowing the radiation source turntable to rotate. When the pneumatic circuit opening and closing electric push cylinder is closed, the lifting tubes abut against the radiation source turntable, fixing the radiation source turntable in place.

[0006] Preferably, a lifting interface sealing ring is fixedly provided at the contact position between the lifting pipe and the radiation source turntable.

[0007] Preferably, the device further includes an irradiation device housing, the radiation source shielding container, the radiation source selection device, and the gas path opening and closing device are all disposed inside the irradiation device housing, the pneumatic transmission air inlet pipe passes through the bottom of the irradiation device housing, and the radiation source pneumatic transmission channel passes through the top of the irradiation device housing.

[0008] Preferably, the bottom of the irradiation device housing is provided with a pulley for rotation.

[0009] Preferably, at least one of the multiple source positions on the radioactive source turntable is not used to place a radioactive source.

[0010] Preferably, the portion of the pneumatic circuit opening and closing push cylinder gripper inserted into the lifting pipe has a protrusion, which engages with the lifting pipe to strengthen the connection between the pneumatic circuit opening and closing push cylinder gripper and the lifting pipe.

[0011] Preferably, the portion of the pneumatic transmission channel of the radiation source located outside the housing of the irradiation device and connected to the housing of the irradiation device is provided with a connecting flange to increase the connection rigidity between the pneumatic transmission channel of the radiation source and the housing of the irradiation device, and the portion of the pneumatic transmission channel of the radiation source located outside the housing of the irradiation device is provided with a viewing window.

[0012] Preferably, the top of the pneumatic transmission channel for the radiation source is provided with an air hole.

[0013] Preferably, a silicone pad is fixedly provided on the inner side of the top of the pneumatic transmission channel of the radiation source.

[0014] Preferably, a steel shielding cover is detachably installed on the top of the pneumatic transmission channel for the radiation source.

[0015] By adopting the above technical solution, the irradiation device proposed in this invention can avoid close contact between experimental personnel and the radiation source, provide a radiation field that can identify single radionuclides and mixed radionuclides, and facilitates the operation of the radiation source irradiation, enabling timed irradiation. The pneumatic transmission device proposed in this invention includes a gas path opening and closing device, which realizes the opening and closing of the pneumatic transmission channel of the radiation source through a gas path lifting device. When the radiation source transmission channel is open, the radiation source turntable can rotate freely; when the radiation source transmission channel is closed, the gas path remains sealed, avoiding the problem of insufficient or unstable lift of the radiation source due to high-pressure gas leakage. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. The drawings are provided for a better understanding of the invention and are not intended to limit the scope of this disclosure. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 This is a front-view sectional view of an embodiment of the present invention; Figure 2This is a side-view sectional view of an embodiment of the present invention; Figure 3 This is a top view of an embodiment of the present invention; Figure 4 This is a cross-sectional structural schematic diagram of the radiation source selection device and the gas path opening and closing device according to an embodiment of the present invention; Figure 5 This is a top view of the radiation source selection device and gas path opening and closing device according to an embodiment of the present invention; Figure 6 This is a front view of the pneumatic transmission channel for the radiation source according to an embodiment of the present invention; Figure 7 This is a front view of the pneumatic transmission channel for a radiation source with steel shielding, according to an embodiment of the present invention.

[0017] Reference numerals: 1. Radiation source shielding container; 2. Radiation source selection device; 201. Radiation source turntable; 202. Control motor; 203. Turntable origin; 204. Radiation source supporting structure; 3. Gas path opening and closing device; 301. Gas path opening and closing electric push cylinder; 302. Electric push cylinder position sensor; 303. Gas path opening and closing push cylinder gripper; 304. Lifting pipe; 305. Lifting interface sealing ring; 4. Pneumatic transmission air intake pipe; 401. Air intake pipe interface; 402. Air intake pipe solenoid valve; 403. Pressure regulating valve; 5. Radiation source pneumatic transmission channel; 501. Air hole; 502. Silicone pad; 503. Viewing window; 504. Steel shielding cover; 6. Irradiation device housing; 601. Pulley. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figure 1 , Figure 2 and Figure 3 The present invention provides a gamma-ray irradiation device for calibrating a radionuclide identifier, comprising a radioactive source shielding container 1, a radioactive source selection device 2, a gas path opening and closing device 3, a pneumatic transmission inlet pipe 4, a radioactive source pneumatic transmission channel 5, and an irradiation device housing 6.

[0020] The device includes a radiation source shielding container 1 to shield the gamma rays generated by the radiation source and ensure the safety of the test personnel; a radiation source selection device 2 to select multiple radiation sources via a radiation source turntable 201; a gas path opening and closing device 3 to simultaneously ensure the free rotation of the radiation source turntable 201 and the sealing of the gas path; a pneumatic transmission inlet pipe 4 to connect to external high-pressure air to provide power to the device; a radiation source pneumatic transmission channel 5 for lifting and lowering the radiation source, enabling the switching between the irradiation position and the shielding position, with rubber pads installed in both the irradiation position and the shielding position to prevent direct collision between the radiation source and the pipe; and an irradiation device housing 6 to protect the internal mechanical structure, with pulleys 601 rotating at the bottom of the housing 6 to improve the device's mobility.

[0021] Preferred, refer to Figure 4 The radioactive source selection device 2 includes a radioactive source turntable 201, a control motor 202, and a radioactive source support structure 204. It also includes a first fixed plate. The control motor 202 is fixedly mounted on the first fixed plate, and its output shaft is fixedly connected to the end of the central axis of the radioactive source turntable 201. Preferably, a servo motor is used as the control motor 202 in this embodiment. The radioactive source turntable 201 has multiple source positions, and the radioactive source support structure 204 is placed in each of these positions to hold the radioactive source. The turntable origin 203 is a photoelectric switch. A baffle is provided on the central axis of the radioactive source turntable 201. When the radioactive source turntable 201 rotates, it drives the baffle to rotate. The photoelectric switch at the turntable origin 203 records the signal of the baffle blocking the turntable, providing feedback on the rotation and initial position of the radioactive source turntable 201.

[0022] Reference Figure 4 The radiation shielding container is fitted over the radiation source turntable 201 to shield the radioactive rays generated by the radiation source. The radiation source shielding container 1 consists of a lead shielding layer and a stainless steel structural layer from the inside out. The lead shielding layer is used to shield the gamma rays generated by the radiation source. After shielding, the dose rate on the surface of the radiation source container is reduced to below 0.25 μSv / h. The stainless steel structural layer is used to support the structure and improve the strength of the device.

[0023] The radioactive source shielding container 1 is fitted outside the radioactive source turntable 201 and is used to shield the radioactive rays generated by the radioactive source in the radioactive source turntable 201. The pneumatic transmission air intake pipe 4 is located below the radioactive source turntable 201, and the pneumatic transmission air intake pipe 4 is connected to the radioactive source turntable 201. Reference Figure 1The pneumatic transmission channel 5 for the radioactive source is located above the radioactive source turntable 201. The pneumatic transmission channel 5 passes through the radioactive source shielding container 1 and is connected to the radioactive source turntable 201. The central axis of the pneumatic transmission inlet pipe 4 and the pneumatic transmission channel 5 for the radioactive source are on the same straight line. In this embodiment of the invention, the radioactive source turntable 201 is preferably provided with 6 source positions, one of which is not used to place a radioactive source and is left empty. When no experiment is being conducted, the empty position is placed between the pneumatic transmission inlet pipe 4 and the pneumatic transmission channel 5 for the radioactive source shielding container 1, which can shield the other radioactive sources and reduce the harm caused by radioactive rays.

[0024] When high-pressure gas is introduced into the pneumatic transmission inlet pipe 4, the gas in the pneumatic transmission inlet pipe 4 propels the radioactive source support structure 204 in the radioactive source turntable 201 upwards to the top along the radioactive source pneumatic transmission channel 5, facilitating irradiation of the radioactive source. The radioactive source support structure 204 adopts a columnar structure that is wide at both ends and narrow in the middle. The middle part is used to place the gamma-ray source, and the diameters at both ends are slightly smaller than the diameter of the radioactive source pneumatic transmission channel 5. This design ensures that the pressure providing the upward force is as high as possible. The radioactive source support structure 204 is made of polycarbonate, which has almost no shielding effect on the radioactive nuclides placed inside, making it very suitable for the use of nuclide identification instrument calibration. The radioactive source support structure 204 can hold one or two radioactive nuclides. When holding one nuclide, it can be used to realize single radioactive nuclide identification calibration experiments of the nuclide identification instrument. When holding two nuclides, it can be used to realize mixed radioactive nuclide identification calibration experiments of the nuclide identification instrument.

[0025] Reference Figure 4 Preferably, the air inlet 401 of the pneumatic transmission air inlet duct 4 is located at the lowest end of the pneumatic transmission air inlet duct 4. The air inlet 401 is connected to external high-pressure air. An air inlet solenoid valve 402 is installed in the air inlet duct 401 to control the opening and closing of the air passage. The solenoid valve is controlled by a PLC and can realize timed irradiation. The air inlet duct 401 is equipped with a pressure regulating valve 403, which allows the operator to adjust the pressure according to the actual situation and avoids the situation where the radiation source support structure 204 moves too fast due to excessive air pressure, causing a rigid collision between the radiation source and the duct. When the solenoid valve is open, high-pressure gas enters the pneumatic transmission air inlet duct 4, and the high-pressure gas lifts the radiation source support structure 204 into the radiation source transmission channel. When the solenoid valve is closed, the radiation source support structure 204 falls back to the source position in the radiation source turntable 201 due to its own gravity, and is shielded by the radiation source shielding container 1 to ensure experimental safety. In the event of an unexpected power outage or solenoid valve malfunction, the radiation source support structure 204 can automatically descend into the radiation source shielding container 1, ensuring the safety of maintenance personnel and experimental personnel.

[0026] Reference Figure 4The gas path opening and closing device 3 includes a gas path opening and closing electric push cylinder 301, an electric push cylinder position sensor 302, a gas path opening and closing push cylinder gripper 303, and a lifting pipe 304. There are two lifting pipes 304, located in the radioactive source pneumatic transmission channel 5 and the pneumatic transmission inlet pipe 4, respectively. The two lifting pipes 304 are slidably connected to the radioactive source pneumatic transmission channel 5 and the pneumatic transmission inlet pipe 4, respectively, so that the lifting pipes 304 can slide inside the radioactive source pneumatic transmission channel 5 or the pneumatic transmission inlet pipe 4. The end of the lifting pipe 304 near the radioactive source turntable 201 can abut against the radioactive source turntable 201. A lifting interface sealing ring 305 is fixedly provided at the contact position between the lifting pipe 304 and the radioactive source turntable 201. When the lifting pipe 304 abuts against the radioactive source turntable 201, the lifting interface sealing ring 305 keeps the gas path sealed, avoiding the problem of insufficient lift and unstable lift of the radioactive source caused by high pressure gas leakage. The riser tube 304 is designed with a horn-shaped interface. The end of the riser tube 304 near the radioactive source turntable 201 has a larger interface. Even if there is a slight misalignment between the radioactive source and the gas path, the riser tube can be raised and lowered smoothly, which improves the redundancy of the device.

[0027] Reference Figure 4 The device also includes a vertical plate, which is perpendicular to the first fixed plate. The top of the vertical plate is fixedly connected to the first fixed plate, and the bottom of the vertical plate is fixedly connected to a second fixed plate. The second fixed plate is connected to the outer shell 6 of the irradiation device, providing overall support. An electric push cylinder 301 for opening and closing the air passage is fixedly mounted on the side of the vertical plate. The extension direction of the electric push rod of the electric push cylinder 301 is perpendicular to the extension direction of the pneumatic transmission inlet pipe 4. Two symmetrically arranged connecting rods are rotatably mounted on the output end of the electric push cylinder 301. Two gas passage opening and closing cylinder grippers 303 are provided. The end of each connecting rod away from the electric push cylinder 301 is rotatably connected to one gas passage opening and closing cylinder gripper 303. The two gas passage opening and closing cylinder grippers 303 are respectively inserted into two lifting pipes 304. The portion of the gas passage opening and closing cylinder gripper 303 inserted into the lifting pipe 304... The device is provided with a protrusion that engages with the lifting pipe 304, strengthening the connection between the gas path opening / closing push cylinder handle 303 and the lifting pipe 304. When the gas path opening / closing electric push cylinder 301 is opened, it pushes the connecting rod, and the gas path opening / closing push cylinder handle 303 moves the lifting pipe 304 away from the radioactive source turntable 201, allowing the radioactive source turntable 201 to rotate. In this embodiment of the invention, the distance between the lifting pipe 304 and the radioactive source turntable 201 at this time is preferably 5mm. When the gas path opening / closing electric push cylinder 301 is closed, the lifting pipe 304 abuts against the radioactive source turntable 201, fixing the radioactive source turntable 201.

[0028] The gas path opening and closing electric push cylinder 301 is controlled by 24V DC power for its extension and retraction. When a positive 24V voltage is applied, the gas path opening and closing electric push cylinder 301 extends, driving the lifting pipe 304 away from the radiation source turntable 201, and the gas path is in an open state, allowing the radiation source turntable 201 to move freely. When a reverse 24V voltage is applied to the gas path opening and closing electric push cylinder 301, the electric push cylinder 301 retracts, driving the lifting pipe 304 to press against the radiation source turntable 201. At this time, the radiation source turntable 201 cannot rotate, and the gas path remains sealed. High-pressure gas can be introduced into the air inlet pipe interface 401 to raise the radiation source. The electric push cylinder position sensor 302 is used to provide feedback on the actual position of the push cylinder. The operation of the radiation source turntable 201 is only allowed after the position sensor senses a signal. The purpose is to prevent structural damage caused by rotating the radiation source turntable 201 when the gas path is sealed.

[0029] Reference Figure 5 and Figure 6 The pneumatic transmission channel 5 for the radioactive source is located outside the housing 6 of the irradiation device and is connected to the housing 6 of the irradiation device by a connecting flange to increase the connection rigidity between the pneumatic transmission channel 5 for the radioactive source and the housing 6 of the irradiation device. The part of the pneumatic transmission channel 5 for the radioactive source located outside the housing 6 of the irradiation device is provided with a viewing window 503. The pneumatic transmission channel 5 for the radioactive source is made of stainless steel, and the various pipes are connected by flanges and spliced ​​to the required length. The viewing window 503 is used to observe the position of the radioactive source. The viewing window 503 is made of polycarbonate, which has almost no shielding effect on radioactive nuclides and is very suitable for the use scenario of nuclide identification instrument calibration.

[0030] Reference Figure 6 The top of the pneumatic transmission channel 5 for the radioactive source has an air hole 501. The function of the air hole 501 is to connect the top of the pneumatic transmission channel 5 for the radioactive source with the outside air, ensuring that the upper end of the lifting pipe 304 is at ambient air pressure. A silicone pad 502 is fixedly installed on the inner side of the top of the pneumatic transmission channel 5 for the radioactive source. The silicone pad 502 acts as a buffer pad for the lifting pipe 304, which can prevent the radioactive source support structure 204 from colliding with the pneumatic transmission channel 5 for the radioactive source during the rising process. At the same time, the silicone pad 502 is in close contact with the radioactive source support structure 204, which can ensure the airtightness of the air passage and prevent high-pressure gas leakage from causing instability in the position of the radioactive source.

[0031] Reference Figure 7 The top of the pneumatic transmission channel 5 for the radioactive source is detachably equipped with a steel shield 504. According to the requirements of the "Calibration Specification for Handheld Radiation Monitors for Detection and Identification of Radionuclides" (JJF1687-2018), steel shielding is required for the nuclide when identifying a single radionuclide. 241 Am uses 3mm steel shielding. 60 Co、 137Cs adopts 5mm steel shielding. In this embodiment, the steel shielding cover 504 is set to 3mm and 5mm thickness respectively. The shielding cover is a detachable structure. When steel shielding needs to be added, it can be fixed to the top of the radiation source pneumatic transmission channel 5 through the fixing screw hole at the top.

[0032] The actual workflow of this embodiment of the invention is as follows: When no experiment is being conducted or when personnel enter the laboratory, the empty space is positioned between the pneumatic transmission channel 5 and the pneumatic transmission inlet pipe 4 to reduce radiation leakage. When an experiment is required, the pneumatic circuit opening and closing electric push cylinder 301 is activated, allowing the radioactive source turntable 201 to rotate. At this time, the control motor 202 is activated, rotating the radioactive source to be irradiated to the space between the pneumatic transmission channel 5 and the pneumatic transmission inlet pipe 4. Then, the pneumatic circuit opening and closing electric push cylinder 301 and the control motor 202 are closed. Next, the solenoid valve is opened, and high-pressure gas lifts the radioactive source support structure 204 to the top of the pneumatic transmission channel 5, completing the irradiation. Afterward, the solenoid valve is closed, and the radioactive source support structure 204 automatically falls back, completing one experiment.

[0033] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0034] For the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0035] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gamma-ray irradiation device for calibrating a radionuclide identifier, characterized in that, It includes a radioactive source shielding container (1), a radioactive source selection device (2), a gas path opening and closing device (3), a pneumatic transmission inlet pipe (4), and a radioactive source pneumatic transmission channel (5), wherein: The radioactive source selection device (2) includes a radioactive source turntable (201), a control motor (202), a turntable origin (203), and a radioactive source support structure (204). The output shaft of the control motor (202) is fixedly connected to the end of the central shaft of the radioactive source turntable (201). The radioactive source turntable (201) has multiple source positions, and the radioactive source support structure (204) is placed in the source positions. The radioactive source support structure (204) is used to place the radioactive source, and the turntable origin (203) is used for calibration and feedback of the initial position. The radioactive source shielding container (1) is fitted outside the radioactive source turntable (201) and is used to shield the radioactive rays generated by the radioactive source in the radioactive source turntable (201); The pneumatic transmission air intake pipe (4) is located below the radioactive source turntable (201) and is connected to the radioactive source turntable (201); The pneumatic transmission channel (5) of the radioactive source is located above the radioactive source turntable (201). The pneumatic transmission channel (5) of the radioactive source passes through the radioactive source shielding container (1) and is connected to the radioactive source turntable (201). The central axis of the pneumatic transmission inlet pipe (4) and the pneumatic transmission channel (5) of the radioactive source are on the same straight line. When high-pressure gas is introduced into the pneumatic transmission inlet pipe (4), the gas in the pneumatic transmission inlet pipe (4) pushes the radioactive source bearing structure (204) in the radioactive source turntable (201) upward to the top along the radioactive source pneumatic transmission channel (5), so as to facilitate the irradiation of the radioactive source; The gas path opening and closing device (3) includes a gas path opening and closing electric push cylinder (301), an electric push cylinder position sensor (302), a gas path opening and closing push cylinder gripper (303), and a lifting pipe (304). There are two lifting pipes (304), which are located in the radioactive source pneumatic transmission channel (5) and the pneumatic transmission inlet pipe (4), respectively. The two lifting pipes (304) are slidably connected to the radioactive source pneumatic transmission channel (5) and the pneumatic transmission inlet pipe (4), respectively, so that the lifting pipe (304) can slide in the radioactive source pneumatic transmission channel (5) or the pneumatic transmission inlet pipe (4). The end of the lifting pipe (304) near the radioactive source turntable (201) can abut against the radioactive source turntable (201). The output end of the gas path opening and closing electric push cylinder (301) is rotatably equipped with two symmetrically arranged connecting rods. There are two gas path opening and closing push cylinder grippers (303). The end of each connecting rod away from the gas path opening and closing electric push cylinder (301) is rotatably connected to one gas path opening and closing push cylinder gripper (303). The two gas path opening and closing push cylinder grippers (303) are respectively inserted into two lifting tubes (304). When the gas path opening and closing electric push cylinder (301) is opened, the gas path opening and closing electric push cylinder (301) pushes the connecting rod, and the gas path opening and closing push cylinder gripper (303) drives the lifting tube (304) away from the radioactive source turntable (201), so that the radioactive source turntable (201) can rotate. When the gas path opening and closing electric push cylinder (301) is closed, the lifting tube (304) abuts against the radioactive source turntable (201) to fix the radioactive source turntable (201).

2. The gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 1, characterized in that, A lifting interface sealing ring (305) is fixedly installed at the contact position between the lifting pipe (304) and the radioactive source turntable (201).

3. A gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 1, characterized in that, The device also includes an irradiation device housing (6), the radiation source shielding container (1), the radiation source selection device (2), and the gas path opening and closing device (3) are all located inside the irradiation device housing (6), the pneumatic transmission air inlet pipe (4) passes through the bottom of the irradiation device housing (6), and the radiation source pneumatic transmission channel (5) passes through the top of the irradiation device housing (6).

4. A gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 3, characterized in that, The bottom of the outer casing (6) of the irradiation device is rotatably equipped with a pulley (601).

5. A gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 1, characterized in that, At least one of the multiple source positions of the radioactive source turntable (201) is not used to place a radioactive source.

6. A gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 1, characterized in that, The portion of the pneumatic circuit opening and closing push cylinder gripper (303) inserted into the lifting pipe (304) has a protrusion. The protrusion engages with the lifting pipe (304) to strengthen the connection between the pneumatic circuit opening and closing push cylinder gripper (303) and the lifting pipe (304).

7. A gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 3, characterized in that, The portion of the pneumatic transmission channel (5) of the radiation source located outside the housing (6) of the irradiation device and connected to the housing (6) of the irradiation device is provided with a connecting flange to increase the connection rigidity between the pneumatic transmission channel (5) of the radiation source and the housing (6) of the irradiation device. The portion of the pneumatic transmission channel (5) of the radiation source located outside the housing (6) of the irradiation device is provided with a viewing window (503).

8. A gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 1, characterized in that, The top of the pneumatic transmission channel (5) for the radioactive source is provided with an air hole (501).

9. A gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 1, characterized in that, A silicone pad (502) is fixedly installed on the inner side of the top of the pneumatic transmission channel (5) for the radioactive source.

10. A gamma-ray irradiation device for calibrating a radionuclide identifier according to claim 1, characterized in that, The top of the pneumatic transmission channel (5) for the radioactive source is detachably equipped with a steel shield (504).

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