An intelligent automatic calibration device and method based on activity meter

Abstract

The present invention relates to an intelligent automatic calibration device and method based on an activity meter. The intelligent automatic calibration device at least comprises: a shielding management unit, a transfer unit and a control unit. The shielding management unit can perform shielding management on a standard bottle containing a radioactive source to prevent the radioactive source from causing harm to the health of the calibration personnel. The transfer unit can move the standard bottle from the shielding management unit to the calibration area of ​​the activity meter to be calibrated, so that the activity meter to be calibrated can measure the radioactive source and generate a measurement value. The control unit can obtain the measurement value. In the case where the control unit can obtain identification information related to the activity meter to be calibrated, the control unit can generate a calibration report template and an original record sheet of the activity meter to be calibrated based on the measurement value, and control the transfer unit based on the identification information to improve the accuracy of the calibration report template and the original record sheet.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic calibration of nuclear monitoring instruments, and in particular to an intelligent automatic calibration device and method based on an activity meter. Background Art

[0002] Medical activity meters are commonly used radionuclide activity measuring instruments in nuclear medicine. They are mainly used for accurate measurement of the activity of short-lived or ultra-short-lived artificial nuclides in clinical diagnosis and treatment. The calibration of medical activity meters has three characteristics. The first characteristic is that medical activity meters are mandatory calibration instruments. Since medical activity meters are related to the safety of patients' lives and national medical and health care, according to the relevant provisions of the "Detailed Catalog of Working Measuring Instruments for Compulsory Verification of the People's Republic of China", radioactivity meters are mandatory calibration instruments and must be strictly calibrated in accordance with the relevant requirements of JJG 377-2019 "Radioactivity Meter Calibration Procedure", and the calibration cycle of activity meters generally does not exceed twenty-four months. The second characteristic is that the activity value of the standard source used in the calibration process is relatively high. For example, the activity value of the standard source is usually between one hundred microcuries and five millicuries, so the activity value of the standard source exceeds the exemption level. During the operation, the calibration personnel must carry out necessary safety protection in accordance with the basic principles of radiation protection optimization and personal dose limit, and monitor and limit the radiation received by individuals. The third characteristic is the rapid growth of activity meter calibration volume. With the rapid development of nuclear medicine, the volume of radioactivity meter calibration business is continuously increasing.

[0003] At present, in the metrology industry, medical activity meters are still mainly calibrated manually, that is, the calibration personnel manually take and place the radioactive source, transcribe data, calculate data and issue certificates under the necessary radiation protection conditions, so the detection cycle of the above calibration work is long. At the same time, not only is the quality of the above calibration results closely related to the operating level and operating status of the calibration personnel, but also in the process of taking and placing the radioactive source, the calibration personnel are at risk of being irradiated by the radioactive source, and the radioactive source is also at risk of leakage. Based on the characteristics of the calibration of medical activity meters and the existing calibration methods, it is urgent to apply automation technology to replace manual work to complete a large number of simple and repetitive calibration work, thereby shortening the detection cycle of the calibration work and reducing the contact time between the calibration personnel and the radioactive source. In addition, most of the commercial medical radioactivity meters on the market have the function of communicating through the serial port, so the data of the activity meter can be viewed on the computer side, which also provides a basis for the periodic tracing of the calibration data of the activity meter. In summary, the existing technology mainly uses manual methods to calibrate the activity meter. However, the above-mentioned manual calibration method has the following disadvantages: 1) Manual calibration poses a potential threat to the health of the calibration personnel: for example, in the calibration process of the activity meter, the calibration personnel need to use three medical short-half-life radionuclides, Tc-99m, I-131 and F-18, and the activity values ​​of the above-mentioned radionuclides are between 100 microcuries and 5 millicuries, that is, the activity values ​​of the above-mentioned radionuclides are relatively high, and thus the above-mentioned radionuclides pose a potential threat to the health of the calibration personnel; 2) The detection cycle of manual calibration is long: since the calibration personnel need to manually replace the radioactive source during the calibration process, , or perform operations such as transcribing data, data analysis, and making certificates, so a skilled calibration personnel can only complete the calibration of about eight activity meters in one day. When the workload of the activity meter calibration is large, the detection cycle of the activity meter is long; 3) The degree of electronicization of the calibration data is low: after the calibration personnel complete the calibration of the activity meter manually, the calibration personnel can only issue a paper certificate or an electronic certificate based on the calibration result of the time, and cannot trace and monitor the calibration data of the same instrument (such as the activity meter) over a long period of time. Therefore, it is necessary to improve the shortcomings of the existing technology.

[0004] In addition, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides an intelligent automatic calibration device based on an activity meter with high automation, good reliability and high accuracy. The intelligent automatic calibration device can realize the automatic transfer of standard sources, custom programming and storage of calibration processes, correction of half-life, data analysis and issuance of certificate templates / original record sheets, and can also realize remote video monitoring of the calibration process. In addition, the intelligent automatic calibration device does not require manual movement of the radiation source and can be operated remotely and in real time by the calibration personnel.

[0006] The intelligent automatic testing device at least comprises: a shielding management unit, a transfer unit and a control unit.

[0007] The shielding management department is able to perform shielding management on standard bottles containing radioactive sources and improve the storage safety of radioactive sources.

[0008] The transfer unit can move the standard bottle from the shielding management unit to the calibration area of ​​the activity meter to be calibrated, so that the activity meter to be calibrated can measure the radioactive source and generate a measurement value. The control unit can obtain the measurement value.

[0009] When the control unit is able to obtain identification information related to the activity meter to be calibrated, the control unit can control the transfer unit based on the identification information while generating a calibration report template and an original record sheet of the activity meter to be calibrated based on the measurement value, so as to improve the accuracy of the calibration report template and the original record sheet.

[0010] Through the above configuration, that is, through the cooperation between the guide rail, the robotic arm, the laser sensor, the ultrasonic ranging sensor and other related components, the automation and standardization of the calibration process of the medical activity meter can be achieved; the control unit can obtain the relevant data information (such as the above measurement value) of the activity meter to be calibrated through the RS232 communication serial port, and can classify, analyze and calculate the above relevant data information, and issue a calibration report template and an original record sheet, ultimately realizing the standardization and electronicization of the calibration data, and laying a technical foundation for the periodic traceability of the calibration data.

[0011] According to a preferred embodiment, the shielding management unit at least includes a shielding lead room and a detection tool. At least one storage space for storing the detection tool is provided in the shielding lead room. At least a part of the detection tool can be stored in the storage space and form a sealed whole with the storage space to reduce the health risk of the radioactive source stored in the storage space to the calibration personnel. The detection tool is constructed as a holder for the standard bottle containing the radioactive source. The control unit can establish a data connection with the shielding management unit to obtain the shielding management information of the shielding management unit. The shielding management information at least includes: whether the radioactive source in the detection tool that forms a closed whole with the storage space has leaked. The shielding management information can also include, but is not limited to: the number of detection tools stored in the storage space, etc.

[0012] According to a preferred embodiment, the transfer unit is composed of a guide rail, a robotic arm and a robotic claw, and the guide rail, the robotic arm and the robotic claw can all be controlled by the control unit, and the control unit can issue action instructions to the guide rail, the robotic arm and the robotic claw respectively, wherein the guide rail, the robotic arm and the robotic claw can move based on the action instructions to transfer the standard bottle containing the radioactive source from the shielding management unit to the calibration area of ​​the activity meter to be calibrated.

[0013] A plurality of positioning fixtures can be evenly distributed on the work surface along the axial direction parallel to the guide rail. Preferably, the positioning fixture can at least fix a part of the activity meter to be calibrated on the work surface. Preferably, the positioning fixture can be flexibly set according to the actual calibration requirements.

[0014] The detection tool corresponding to the to-be-calibrated area of ​​the to-be-calibrated activity meter can send a data request to the positioning tool or the to-be-calibrated activity meter corresponding to the to-be-calibrated area. The positioning tool or the to-be-calibrated activity meter can obtain the data request and forward the data request sent by the detection tool to the control unit, and the control unit obtains identification information corresponding to the data request based on the data request sent by the detection tool.

[0015] The identification information at least includes: the type of radioactive source required to be measured by the activity meter to be calibrated. The type of radioactive source in the detection tool is the same as / corresponds to the type of radioactive source required to be measured by the activity meter to be calibrated.

[0016] The identification information can also include: the activity value measured by the activity meter to be calibrated and the unit of the activity value.

[0017] According to a preferred embodiment, a laser transmitter is provided on the mechanical claw, and a laser receiver is provided on the work surface where the guide rail is located, so as to detect the verticality of the detection tooling during the process of being transferred by the mechanical claw through the laser transmitter and the laser receiver.

[0018] Through the above configuration, that is, the verticality of the detection tooling during the transfer process is checked by the laser sensor; when and only when the detection tooling is grasped by the mechanical claw in a manner perpendicular to the horizontal plane, the laser can pass through the vertical detection hole and shoot to the laser receiver on the work surface, thereby ultimately ensuring that the detection tooling is always perpendicular to the work surface during the transfer process, so as to avoid the standard bottle in the detection tooling from falling and polluting the internal environment of the device.

[0019] According to a preferred embodiment, at least one vertical detection hole is provided on the skirt of the detection tooling, so that the laser emitted by the laser transmitter can pass through the vertical detection hole and be received by the laser receiver located on the work surface.

[0020] According to a preferred embodiment, an ultrasonic distance sensor is also provided at the end of the mechanical arm close to the work surface. The distance sensor can detect the activity meter to be calibrated located on the work surface and obtain detection information. The ultrasonic distance sensor can send the detection information to the control unit.

[0021] Through the above configuration, the ultrasonic ranging sensor can check whether the activity meter to be calibrated is in place, whether it is located at the center of the positioning tooling, whether it is perpendicular to the work surface, whether there are foreign objects inside the activity meter to be calibrated, and the depth of the well of the activity meter to be calibrated through multi-point ranging. The ultrasonic ranging sensor can also control the descent distance of the mechanical claw.

[0022] According to a preferred embodiment, the control unit can obtain the detection information of the ultrasonic ranging sensor and the discrimination information of the laser receiver, and the control unit can move the detection fixture into the calibration area of ​​the activity meter to be calibrated / standard-level activity meter through the mechanical arm and the mechanical claw based on the detection information of the ultrasonic ranging sensor. The control unit sends a data reading instruction to the activity meter to be calibrated corresponding to the positioning fixture, and the activity meter to be calibrated can obtain the data reading instruction and start the data reading operation at that time.

[0023] The present invention also provides an intelligent automatic calibration method based on an activity meter. The method comprises: a shielding management unit performs shielding management on a standard bottle containing a radioactive source; a transfer unit automatically moves the standard bottle from the shielding management unit to a calibration area of ​​the activity meter to be calibrated, so that the activity meter to be calibrated can measure the radioactive source and generate a measurement value; a control unit obtains the measurement value; and the control unit generates a calibration report template and an original record sheet of the activity meter to be calibrated based on the measurement value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a simplified schematic diagram of a preferred embodiment of the transfer part and the positioning tool of the present invention;

[0025] Figure 2 is a simplified schematic diagram of a preferred embodiment of the present invention;

[0026] Figure 3 It is a simplified schematic diagram of a preferred implementation of the shielding management unit and the detection tooling provided by the present invention;

[0027] Figure 4 It is a simplified schematic diagram of a preferred implementation of the detection tooling provided by the present invention;

[0028] Figure 5 is a simplified schematic diagram of a preferred embodiment of the mechanical claw and the laser emitter provided by the present invention;

[0029] Figure 6 This is a structural diagram of a mobile platform.

[0030] Reference numerals list

[0031] 1: Shielding management department; 2: Transfer department; 3: Control department;

[0032] 4: Activity meter to be calibrated; 101: Shielded lead chamber; 102: Testing tooling;

[0033] 201: guide rail; 202: robotic arm; 203: robotic claw;

[0034] 205: laser transmitter; 206: image acquisition device; 207: ultrasonic distance sensor;

[0035] 208: laser receiver; 209: positioning tool. DETAILED DESCRIPTION

[0036] The following is a detailed description with reference to the accompanying drawings.

[0037] Figure 1 and Figure 2 An intelligent automatic calibration device based on an activity meter is shown.

[0038] The intelligent automatic calibration device at least includes: a shielding management unit 1, a transfer unit 2 and a control unit 3. The shielding management unit 1 can perform shielding management on the standard bottle containing the radioactive source to prevent the radioactive source from causing harm to the health of the calibration personnel. The transfer unit 2 can move the standard bottle from the shielding management unit 1 to the calibration area of ​​the activity meter 4 to be calibrated, so that the activity meter 4 to be calibrated can measure the radioactive source and generate a measurement value. The control unit 3 can obtain the measurement value. In the case where the control unit 3 is able to obtain the identification information related to the activity meter 4 to be calibrated, the control unit 3 can generate a calibration report template and an original record sheet of the activity meter 4 to be calibrated based on the measurement value, and control the transfer unit 2 based on the identification information to improve the accuracy of the calibration report.

[0039] The above measurement values ​​can be recorded in the calibration report template and / or the original record sheet. The calibration personnel need to check the calibration report template and the original record sheet of the activity meter to be calibrated. Only the verified and correct calibration report template can be used as the final calibration report.

[0040] The control unit 3 can establish a data connection with the shielding management unit 1 to obtain the shielding management information of the shielding management unit 1 .

[0041] The shielding management information at least includes: the number of detection tools 102 stored in the storage space.

[0042] The shielding management information may also include: the corresponding relationship between the shielding management unit storage space, the detection tooling 102 and the serial number of the radiation source.

[0043] The calibration area is the area where the activity meter 4 to be calibrated measures the radioactive source. Preferably, the calibration area of ​​the activity meter 4 to be calibrated is the ionization chamber of the activity meter 4 to be calibrated. The calibration area of ​​the activity meter 4 to be calibrated can also be other areas of the activity meter 4 to be calibrated.

[0044] The calibration device can also include an equipment body. A plurality of equipment layers are arranged in the equipment body. The equipment layer is used to install or store relevant equipment for calibrating the activity meter. Preferably, the plane where the equipment layer is located is parallel to the horizontal plane. Preferably, the equipment body can be in the shape of a rectangular parallelepiped. The equipment body can be made of high-strength load-bearing aluminum profiles. The equipment body has the characteristics of convenient disassembly and assembly. Preferably, the equipment body is provided with a plurality of side doors. The side doors can all be opened. Preferably, only one side door is arranged on the left side of the equipment body. Preferably, at least two side doors are arranged on the right side of the equipment body, so that the calibration personnel can transfer the relevant equipment to the inside of the equipment body through the above two side doors. Preferably, the main door of the equipment body adopts a transparent acrylic plate with a frame. Through this setting mode, the equipment body can not only play a certain protective effect, but also facilitate the calibration personnel to observe the calibration process of the activity meter 4 to be calibrated in the equipment body in real time through the above main door. A work surface is arranged in the equipment body.

[0045] Preferably, the work surface is arranged in the second equipment layer. The components / equipment related to the calibration can be installed on the work surface. The installation height of the work surface should meet the requirements of ergonomics so that the calibration personnel can use the components / equipment related to the calibration on the work surface.

[0046] The bottom of the equipment body is made of high-strength profiles. The work surface is made of aluminum plate, which can ensure the flatness of the work surface while ensuring the strength of the work surface.

[0047] The above-mentioned components / equipment related to the verification may include but are not limited to: a shielding management unit 1, a transfer unit 2, etc.

[0048] Preferably, the shielding management unit 1 is arranged on a work surface. Preferably, the shielding management unit 1 can be a six-hole shielding lead chamber 101. The shielding management unit 1 can also use other components or devices that can shield the radiation source. Preferably, the shielding management unit 1 can be in a rectangular shape. Preferably, the thickness of the shielding management unit 1 can reach ten centimeters.

[0049] The radioactive source stored in the shielding management unit 1 may be in solid or liquid form. For example, the radioactive source may be a standard radioactive solution. The radioactive source stored in the shielding management unit 1 may be a radioactive nuclide standard source as specified in JJG 377-2019 "Radioactivity Meter Calibration Procedure". There may be multiple types of radioactive sources stored in the shielding management unit 1. The type of radioactive source stored in the shielding management unit 1 may be determined by the calibration personnel according to actual calibration requirements. Preferably, one shielding management unit 1 can accommodate multiple detection tooling 102. For example, one shielding management unit 1 can accommodate six detection tooling 102.

[0050] Preferably, the standard bottle can be an ampoule or a vial.

[0051] According to a preferred embodiment, Figure 2 As shown, the shielding management unit 1 includes at least a shielding lead chamber 101 and a detection tool 102. At least one storage space for storing the detection tool 102 is provided in the shielding lead chamber 101, wherein at least a portion of the detection tool 102 can be stored in the storage space and form a sealed whole with the storage space, so as to effectively reduce the health risks caused by the radioactive sources stored in the storage space to the health of the inspection personnel.

[0052] One test fixture 102 can only accommodate one standard bottle containing a radioactive source. Through this configuration, the probability of leakage of the radioactive source in the test fixture 102 is reduced by the fully sealed test fixture 102 without affecting its verification characteristics. Figure 4As shown, in actual verification operation, a transparent plastic sheet can be used to seal the gap of the detection tool 102 to reduce the probability of leakage of the radioactive source in the detection tool 102.

[0053] When the detection tool 102 is moved by the mechanical claw 203 into the calibration area of ​​the activity meter 4 to be calibrated, the state of the detection tool 102 is the calibration state.

[0054] According to a preferred embodiment, the transfer unit 2 is composed of a guide rail 201, a mechanical arm 202 and a mechanical claw 203. The guide rail 201, the mechanical arm 202 and the mechanical claw 203 can all be controlled by the control unit 3, and the control unit 3 can issue action instructions to the guide rail 201, the mechanical arm 202 and the mechanical claw 203 respectively, wherein the guide rail 201, the mechanical arm 202 and the mechanical claw 203 can move based on the action instructions to transfer the standard bottle containing the radioactive source from the shielding management unit 1 to the calibration area of ​​the activity meter 4 to be calibrated.

[0055] The guide rail 201 is disposed on the work surface.

[0056] Preferably, the robot arm 202 can move along the axial direction of the guide rail 201. Preferably, the axial direction of the robot arm 202 is perpendicular to the axial direction of the guide rail 201.

[0057] Preferably, the mechanical claw 203 is disposed at the end of the mechanical arm 202 away from the guide rail 201 .

[0058] Preferably, the shielding management part 1 is arranged near the guide rail 201 .

[0059] The control unit 3 can control the movement of the guide rail 201 , the robot arm 202 and the robot claw 203 , and take the detection tooling 102 out of the shielding management unit 1 through the cooperation of the guide rail 201 , the robot arm 202 and the robot claw 203 .

[0060] When the control unit 3 receives the start instruction for starting the inspection work, the control unit 3 can issue action instructions to the guide rail 201, the robot arm 202 and the robot claw 203. The start instruction for starting the inspection work can be issued by the inspection personnel through the control unit 3.

[0061] The guide rail 201, the mechanical arm 202 and the mechanical claw 203 can respectively obtain the action instructions issued by the control unit 3, and move based on the action instructions to transfer the detection tool 102 containing the radioactive source to the calibration area of ​​the activity meter 4 to be calibrated. The guide rail 201 can be a load-bearing linear guide rail 201. The guide rail 201 has the characteristics of high precision, high reliability and high stability. The accuracy of the guide rail 201 for repeated sliding along a straight line is plus or minus zero point one millimeter.

[0062] The robot arm 202 may be an intelligent collaborative robot arm 202. Preferably, the robot arm 202 can at least realize four-axis linkage. The robot arm 202 has the characteristics of high precision and high reliability of repeated positioning. The end of the robot arm 202 close to the guide rail 201 is movably connected to the guide rail 201. Preferably, the robot arm 202 can also obtain the action command issued by the control unit 3.

[0063] According to a preferred embodiment, the detection tool 102 corresponding to the area to be calibrated of the activity meter 4 to be calibrated can send a data request to the positioning tool 209 corresponding to the area to be calibrated. The positioning tool 209 can obtain the data request and forward the data request sent by the detection tool 102 to the control unit 3. The control unit 3 obtains the identification information corresponding to the data request based on the data request sent by the detection tool 102.

[0064] Preferably, the work surface is provided with a plurality of positioning fixtures 209. The positioning fixtures 209 are used to define the position of the activity meter to be inspected on the work surface.

[0065] The positioning fixture 209 can be set in a variety of different specifications according to the caliber of the ionization chamber of the existing activity meter. Preferably, the positioning fixture 209 can fix the activity meter to be calibrated 4. Preferably, the positioning fixture 209 can be in a circular ring shape.

[0066] Preferably, the centers of the multiple positioning fixtures 209 are all located on the same defined straight line, and the defined straight line is parallel to the straight line on which the axial direction of the guide rail 201 is located.

[0067] Preferably, the robot arm 202 can perform reciprocating translation along the guide rail 201 and move to the position specified by the action instruction. The robot arm 202 can also perform translation along the axial direction perpendicular to the guide rail 201 and / or perform lifting and lowering motion along the direction perpendicular to the work surface. Preferably, the positioning accuracy of the repeated motion of the robot arm 202 can reach plus or minus 0.1 mm.

[0068] A mechanical claw 203 is provided at the end of the mechanical arm 202 away from the guide rail 201. Preferably, the mechanical claw 203 can achieve a rotation of 360 degrees. Preferably, the mechanical claw 203 is provided with at least one recessed portion. The recessed portion can match the raised portion on the top of the detection tooling 102, so that the mechanical claw 203 can firmly clamp the detection tooling 102 and prevent the detection tooling 102 from slipping during the transfer process by the mechanical claw 203. Preferably, the mechanical claw 203 is a high-precision mechanical claw 203.

[0069] Preferably, the transfer unit 2 can further include a detection tool 102. The detection tool 102 can serve as a support for a standard bottle containing a radioactive source, so that the mechanical gripper 203 can move / transfer the standard bottle containing a radioactive source by moving / transferring the detection tool 102.

[0070] The detection tool 102 can be stored vertically inside the shielding lead chamber 101. When the standard bottle in the detection tool 102 has been stored in the shielding lead chamber 101, the protrusion of the detection tool 102 away from the shielding lead chamber 101 can be located outside the shielding lead chamber 101.

[0071] The mechanical claw 203 can grab the end of the detection tool 102 away from the shielded lead chamber 101, and move the detection tool 102 in a direction away from the shielded lead chamber 101 to take the detection tool 102 out of the shielded lead chamber 101. The inspector can put the ampoule / vial containing the standard radioactive solution into the detection tool 102. After that, the inspector puts the detection tool 102 into the shielded lead chamber 101 for inspection. Through this configuration, that is, the detection tool 102 containing the radioactive source is transferred by the transfer unit 2, so that the inspector can remotely operate the device, thereby reducing the health risks brought by the inspector's contact with the radioactive source.

[0072] The relevant information of the radioactive source in the standard bottle is input in advance by the calibration personnel using the supporting relevant software before the calibration. Once the relevant information of the radioactive source in the standard bottle is input and confirmed, the relevant information of the radioactive source will not change by default.

[0073] The system instructions are set manually by the test personnel through the control unit 3. Since the test procedures / operations of different activity meters are slightly different, the system instructions corresponding to the actual test work of each activity meter 4 to be tested are also different.

[0074] The system instruction at least includes: the inspection information of the activity meter 4 to be calibrated, the model information, the type and activity range of the radioactive source required to calibrate the activity meter 4 to be calibrated. The inspection information may include but is not limited to: the inspection unit, address, contact person, inspection date, calibration date, etc.

[0075] The system instructions may also include but are not limited to: the number of the positioning fixture 209 where the activity meter 4 to be calibrated is located, the time for the activity meter 4 to be calibrated to measure each radioactive source, the number of times the activity meter 4 to be calibrated needs to repeatedly measure the radioactive source, etc.

[0076] like Figure 1As shown, the limited position of the activity meter 4 to be calibrated refers to the position of the activity meter 4 to be calibrated when it is calibrated, which is limited by the positioning fixture 209. A plurality of positioning fixtures 209 can be evenly distributed on the work surface along a straight line parallel to the guide rail 201. Preferably, the positioning fixture 209 can at least fix a part of the area of ​​the activity meter 4 to be calibrated on the work surface. Preferably, the positioning fixture 209 can be flexibly set according to the actual calibration requirements.

[0077] When the transfer unit 2 transfers the detection jig 102 from the shielding management unit 1 to the area to be calibrated of the activity meter 4 to be calibrated corresponding to the system instruction based on the system instruction, the detection jig 102 entering the area to be calibrated of the activity meter 4 to be calibrated can be placed in the area to be calibrated (such as an ionization chamber) by the robotic arm 202 in a manner vertically aligned with the positioning jig 209 corresponding to the area to be calibrated based on the instruction issued by the control unit 3.

[0078] The positioning fixture 209 corresponding to the area to be tested refers to the positioning fixture 209 where the activity meter 4 to be tested corresponding to the area to be tested is located. The position of each positioning fixture 209 in the device is fixed. The position information of the positioning fixture 209 can be preset in the relevant application of the control unit 3. When the robot arm 202 moves to each positioning fixture according to the preset program, the robot arm will stop.

[0079] The detection tool 102 corresponding to the area to be calibrated of the activity meter 4 to be calibrated can send a data request to the positioning tool 209 corresponding to the area to be calibrated.

[0080] The positioning tool 209 corresponding to the area to be inspected obtains the data request sent by the inspection tool 102 , and forwards the data request sent by the inspection tool 102 to the control unit 3 .

[0081] The control unit 3 obtains the data request sent by the positioning tool 209, and based on the data request sent by the positioning tool 209 and the detection information obtained by the ultrasonic ranging sensor 207 (such as the well depth of the activity meter 4 to be calibrated and the distance between the detection tool 102 and the positioning tool 209), controls the robotic arm 202 to move the detection tool 102 to the calibration area of ​​the activity meter 4 to be calibrated (such as the center of the ionization chamber of the activity meter 4 to be calibrated).

[0082] The corresponding information between the detection tool 102 and the radiation source is input by the verification personnel into the control unit 3 through software before the verification work begins. During the verification process, the corresponding information between the detection tool 102 and the radiation source remains unchanged by default.

[0083] The control unit 3 can also obtain identification information corresponding to the data request.

[0084] The identification information at least includes: the type of radioactive source required to be measured by the activity meter 4 to be calibrated corresponding to the positioning fixture 209. For example, after the calibration personnel correctly places a certain activity meter 4 to be calibrated in a certain positioning fixture 209, the calibration personnel can input the type of radioactive source required for the calibration work of the activity meter 4 to be calibrated corresponding to the positioning fixture 209 through the control unit 3.

[0085] The type of radioactive source required for the calibration of the activity meter 4 to be calibrated corresponding to the positioning tool 209 may be the type of radioactive source in the identification information corresponding to the data request forwarded by the positioning tool 209 .

[0086] Particularly preferably, the identification information can also include: the activity value of the radioactive source measured by the to-be-calibrated activity meter 4 corresponding to the positioning tool 209 and the unit of the activity value.

[0087] like Figure 3 As shown, the image acquisition device 206 is disposed at the end of the robot arm 202 facing the positioning tool. The image acquisition device 206 is used to photograph the display interface of the activity meter to be calibrated. The image acquisition device 206 captures and recognizes the measurement values ​​on the display interface of the activity meter to be calibrated without COM port communication through OCR image recognition, and uses the recognized measurement values ​​as original calibration data.

[0088] According to a preferred embodiment, Figure 5 As shown, a laser transmitter 205 is provided on the mechanical claw 203. A laser receiver 208 is provided on the work surface where the guide rail 201 is located, so as to detect the verticality of the tooling 102 during the transfer process by the mechanical claw 203 through the laser transmitter 205 and the laser receiver 208.

[0089] The laser transmitter 205 and the laser receiver 208 can form a laser transmitter. The laser transmitter 205 can move freely with the mechanical claw 203. The laser receiver 208 is fixed on the slide rail of the work table. The laser transmitter 205 is located in the mechanical claw 203. The laser transmitter 205 is cylindrical.

[0090] Preferably, the laser emitter 205 may also be disposed at the end of the mechanical claw 203 close to the work surface.

[0091] The laser receiver 208 is located near the shielding lead chamber 101. For example, the laser receiver 208 can be disposed between the shielding lead chamber 101 and a positioning fixture 209 close to the shielding lead chamber 101. The laser receiver 208 can also be cylindrical.

[0092] The control unit 3 can be data-connected with the laser emitter 205 to identify whether the laser emitter 205 emits laser light.

[0093] The control unit 3 can be data-connected with the laser receiver 208 to receive the identification information of the laser receiver 208. The identification information is used to identify whether the laser receiver 208 receives the laser emitted by the laser emitter 205.

[0094] The function of the laser beam reflector is to check the verticality of the detection tool 102 after the mechanical claw 203 clamps the detection tool 102 from the shielding lead chamber 101.

[0095] The skirt structure of the detection tooling 102 is provided with a vertical inspection hole. Preferably, the skirt structure can be in the shape of a circular ring. For example, the skirt structure can be in the shape of a hollow disc. Preferably, the skirt structure can be integrally connected to the detection tooling 102. Preferably, the skirt structure can also be detachably connected to the detection tooling 102. Preferably, the axial direction of the detection tooling 102 is perpendicular to the plane where the skirt structure is located. Preferably, the vertical inspection holes on the skirt structure are close to the circumferential outer wall of the detection tooling 102. Preferably, the axial direction of the vertical inspection holes on the skirt structure is parallel to the axial direction of the detection tooling 102. The number of vertical inspection holes on the skirt structure can be multiple.

[0096] Preferably, the laser emitter 205 may be a beam-type laser sensor. Preferably, the direction of the laser emitted by the laser emitter 205 is perpendicular to the plane where the work surface is located. The laser emitter 205 can make the laser emitted by it have a light spot as small as possible.

[0097] According to a preferred embodiment, at least one vertical detection hole is provided on the skirt of the detection tool 102, so that the laser emitted by the laser transmitter 205 can pass through the vertical detection hole and be received by the laser receiver 208 located on the work surface.

[0098] When and only when the protruding portion of the detection tooling 102 is clamped by the recessed portion of the mechanical claw 203 , the laser emitter 205 disposed on the mechanical claw 203 can be started and emit laser.

[0099] The laser emitted by the laser transmitter 205 is directed toward the laser receiver 208 installed on the work surface.

[0100] If the laser receiver 208 does not receive the laser emitted by the laser emitter 205 , it indicates that the laser emitted by the laser emitter 205 fails to pass through the vertical detection hole of the detection fixture 102 , that is, the axial direction of the detection fixture 102 is not perpendicular to the plane where the worktable is located.

[0101] Particularly preferably, a standard-grade activity meter is also provided in the device, and the standard-grade activity meter is used to obtain the activity standard value of the radioactive source and the reference time of the standard value.

[0102] Reference time refers to the time when the activity measurement value of a radioactive source is obtained, which is the quantity expressed with the activity value. Since the activity value of a radioactive nuclide changes according to the half-life law, the activity values ​​obtained by measuring the same radioactive source at different time points are different. Therefore, when expressing the activity value, the specific time when the value is measured (i.e., the reference time) must be indicated. For example, using an activity meter to read the activity value of a radioactive source at 14:00 on May 12, 2022, it is 10Bq. Then the expression of the activity value of this radioactive source is: A = 10Bq (May 12, 2022, 14:00), and the reference time of the measurement value is in brackets. Similarly, when using a standard-grade activity meter to measure a radioactive source, the value obtained is the standard value, and the measurement time of the value is the reference time of the standard value. As for the accuracy of the reference time, for long-half-life nuclides, it can be accurate to the date. For short-half-life nuclides, it is best to be accurate to the minute level. The medical nuclides generally measured by the activity meter are all short half-life nuclides, so the reference time in the present invention is accurate to the minute level.

[0103] like Figure 1 As shown, the positioning fixture 209 is arranged on the working surface of the device. The positioning fixture 209 is used to standardize the position of the activity meter to be tested / standard-grade activity meter when being calibrated. The standard-grade activity meter is placed in the positioning fixture 209 on the working surface that is closest to the shielded lead chamber 101. The standard-grade activity meter is used to provide an activity reference value of a radioactive standard source. Other positioning fixtures 209 are used to place activity meters to be tested. This device can hold up to five activity meters to be calibrated. Currently, the positioning fixture 209 is designed with a variety of specifications based on the caliber of the ionization chamber on the market.

[0104] An image acquirer 206 is provided at the end of the robot arm 202 close to the work surface, so as to acquire the measurement value of the activity meter 4 to be inspected / the standard-level activity meter through the image acquirer 206 .

[0105] According to a preferred embodiment, Figure 3 As shown, the end of the mechanical arm 202 close to the work surface is also provided with an ultrasonic distance sensor 207. The distance sensor can detect the activity meter 4 to be calibrated on the work surface and obtain detection information. The ultrasonic distance sensor 207 can send the detection information to the control unit 3.

[0106] The ultrasonic distance measuring sensor 207 disposed at the end of the robot arm 202 close to the work surface can detect multiple points in the calibration area of ​​the activity meter 4 to be calibrated.

[0107] The detection information at least includes whether the activity meter 4 to be calibrated in the positioning fixture 209 is in place, whether the activity meter 4 to be calibrated is located at the center of the positioning fixture 209, whether the activity meter 4 to be calibrated is perpendicular to the plane where the worktable is located, whether there are foreign objects inside the activity meter 4 to be calibrated, and the depth of the activity meter 4 to be calibrated. The detection information can also include the size information of the activity meter 4 to be calibrated, the position information of the positioning fixture 209, and the distance between the detection fixture 102 and the positioning fixture 209.

[0108] According to a preferred embodiment, the control unit 3 can obtain the detection information of the ultrasonic ranging sensor 207 and the discrimination information of the laser receiver 208. The control unit 3 can move the detection tooling 102 into the calibration area of ​​the activity meter 4 / standard-level activity meter to be calibrated through the robotic arm 202 and the robotic claw 203 based on the detection information of the ultrasonic ranging sensor 207.

[0109] When the control unit 3 receives the identification information from the laser receiver 208, the control unit 3 has completed the verticality detection of the detection tool 102. After the laser reflector checks and identifies that the verticality of the detection tool 102 meets the preset requirements, the mechanical claw 203 then sequentially places the detection tool 102 into the standard-level activity meter and the activity meter to be detected. Each time the mechanical claw 203 grabs the detection tool 102, the laser reflector only checks the verticality of the detection tool 102 once.

[0110] For example, if the control unit 3 meets the preset requirements for the verticality of the detection tooling 102 (i.e., the axial direction of the detection tooling 102 is perpendicular to the plane where the worktable is located at this time), the control unit 3 continues to obtain the detection information obtained by the ultrasonic ranging sensor 207. Preferably, the control unit 3 can move the detection tooling 102 to the calibration area of ​​the activity meter to be calibrated / standard-level activity meter based on the above detection information. For example, the control unit 3 can control the mechanical claw 203 to move the detection tooling 102 located directly above the calibration area of ​​the activity meter to be calibrated 4 / standard-level activity meter to the geometric center of the calibration area of ​​the activity meter to be calibrated / standard-level activity meter based on the detection information (such as the well depth of the activity meter to be calibrated 4 and the distance between the detection tooling 102 and the positioning tooling 209). If the verticality of the detection tool 102 by the control unit 3 does not meet the preset requirements (that is, the axial direction of the detection tool 102 is not perpendicular to the plane where the work table is located), the inspection personnel can manually remove the above-mentioned detection tool 102 and put it back into the shielding lead chamber 101.

[0111] Since the activity meter to be calibrated is always in the power-on state during the calibration process, but the activity meter to be calibrated cannot send measurement values ​​to the control unit 3 regularly, the control unit 3 needs to send a data reading instruction to the activity meter to be calibrated 4, so that the activity meter to be calibrated 4 can send measurement values ​​to the control unit 3 based on the data reading instruction.

[0112] After the tooling 102 to be tested is stable in the middle of the ionization chamber for a certain period of time, the control unit 3 sends a data reading instruction to the activity meter 4 to be tested corresponding to the positioning tooling 209. The activity meter 4 to be tested corresponding to the positioning tooling 209 can obtain the above data reading instruction in real time and start the data reading operation at that time, and then send the measurement value of the radioactive source in the tooling 102 to the control unit 3.

[0113] Particularly preferably, a data processing module is provided in the control unit 3. The data processing module has a network time reading function, that is, the data processing module can correct the measured value of the activity meter to be tested to the reference time of the standard value by half-life correction, and then compare it with the standard value, and the time information used to obtain the verification result is traceable to the national time standard. Therefore, in each verification process, the first thing that the radioactive source enters is the ionization chamber of the standard-level activity meter, and then enters the activity meter to be tested in turn.

[0114] The correction process of the half-life by the data processing module is as follows.

[0115] For a certain radionuclide, its half-life is known to be T 1 / 2 After the automatic calibration process is started, the mechanical claw first grabs the radioactive source and enters the standard activity meter. The control unit repeatedly reads 5 numbers and records the measured value A of the standard activity meter. s1 ~A s5 , and the reading time T s1 ~T s5 , T s1 Recorded as the reference time T of the standard value s , A s2 ~A s5 The reference time corrected to the standard value is calculated by the following formula. s2 For example, A s2 Correction value A s2 'for:

[0116]

[0117] ΔT s2 =T s2 -T s

[0118] A s2 is the actual measurement value of the second time of the standard activity meter, the unit is Bq; ΔT s2 T is the time difference between the second measurement reference time and the standard value reference time. The unit of the time difference is consistent with the unit of the half-life. 1 / 2 To set the half-life of the nuclide.

[0119] Next, the robot grips the radioactive source and enters the No. 1 activity meter to be tested, repeats the measurement 5 times, and obtains 5 groups of measurement values ​​(A1~A5) and reference time of the measurement values ​​(T1~T5). Taking the first group as an example (A1 and T1), the correction value A1' of the reference time of correcting A1 to the standard value is:

[0120]

[0121] ΔT1=T1-T s

[0122] A1 is the actual measurement value of the first activity meter to be tested, the unit is Bq; ΔT1 is the time difference between the first measurement reference time and the standard reference time, the unit of the time difference is consistent with the unit of the half-life; T 1 / 2 To set the half-life of the nuclide.

[0123] All measured values ​​are corrected to the reference time of the standard value. In the subsequent calculation of metrological performance parameters, the corrected value is used to evaluate the metrological performance of the instrument, which is more scientific and authentic.

[0124] The control unit 3 can also perform real-time half-life correction based on the comparison measurement to avoid systematic errors caused by the decay of short-lived nuclides.

[0125] The specific method of half-life correction is (taking the calculation of relative inherent error E as an example):

[0126]

[0127] Among them, A S For a standard-grade activity meter, under the conditions and reference time of the nuclide (i.e., radioactive source), the radioactive solution of the corresponding nuclide is measured five times continuously, and the correction value is the same time after deducting the background. This time is the reference time of the standard value. The average value of the measurement is calculated as the standard value, and the unit of the average value of the measurement is Bq; It is the average value of the measured activity meter under the same nuclide setting conditions and reference time, which is measured five times continuously on the radioactive solution of the same corresponding nuclide, after deducting the background and correcting to the reference time of the standard value. The unit of the measured average value is Bq, which is calculated by the following formula:

[0128]

[0129] Among them, A i is the actual measurement value of the activity meter to be tested for the i-th time, and the unit of the actual measurement value is Bq; ΔT i is the time difference between the first reference time of the i-th measurement value and the second reference time of the standard value. The unit of the time difference is consistent with the unit of the half-life. 1 / 2 To set the half-life of the nuclide.

[0130] The first reference time of the measured value is the time when the measurement actually occurs. For an activity meter that communicates via a COM port, it is the time when the control unit receives the measurement result of the activity meter. For an activity meter that obtains the measured value through a camera, it is the time when the data is captured.

[0131] At present, calibration institutions generally use the measured value directly instead of the correction value of the reference time corrected to the standard value for data processing, and the impact caused is related to the type of nuclide used in the calibration. At present, the conventional nuclides used for calibrating working-level activity meters are Tc-99m, I-131, and F-18. The half-lives of these three medical short-lived nuclides are 6 hours, 8 days, and 109 minutes, respectively. For the first two nuclides, the activity value changes within a small range within the measurement time of tens of minutes, and whether to correct it has little effect. However, when using F-18 for calibration, the calibrator must quickly complete a series of processes such as grabbing, placing, reading, and replacing the standard sample, which puts high demands on the calibrator's experience and operation. In particular, in recent years, the development and use of ultra-short-lived nuclear medicines such as C-11 and N-13 (the half-life of C-11 is only 20 minutes) have also put forward the need for activity meters to accurately measure ultra-short-lived nuclides. Once the activity meter needs to measure ultra-short-lived nuclides in practical applications, it is also necessary to use ultra-short-lived nuclides to carry out calibration work and evaluate their metrological performance.

[0132] Therefore, adding a real-time half-life correction function to the measurement results during the calibration process will help improve the scientificity, authenticity and adaptability of the calibration work, reduce dependence on the calibration personnel's operations, and provide technical support for the calibration of activity meters measuring ultra-short-lived nuclides.

[0133] Preferably, the activity meter to be tested 4 or the standard-grade activity meter can directly send the measured value to the control unit 3 .

[0134] The present invention designs an intelligent automatic calibration device and method specifically used for the calibration of medical activity meters. The present invention grabs the radioactive source through the relevant components of the transfer part 2 (such as the mechanical claw 203), so that the calibration personnel can remotely monitor the calibration work of the activity meter, thereby reducing the health risks brought by the contact between the calibration personnel and the radioactive source. The present invention designs a fully sealed radioactive source placement bracket (i.e., the detection tool 102). Under the premise of not affecting its calibration characteristics, the radioactive source placement bracket reduces the risk of leakage of the radioactive source. The device can complete the automatic calibration of the activity meter without manually replacing the radioactive source, transcribing data, and editing certificates, thereby reducing labor costs, improving the efficiency of calibration work, and realizing the standardization and electronicization of calibration data.

[0135] The present invention also provides an intelligent automatic calibration method based on an activity meter. The method comprises: a shielding management unit 1 performs shielding management on a standard bottle containing a radioactive source; a transfer unit 2 automatically moves the standard bottle from the shielding management unit 1 to a calibration area of ​​an activity meter to be calibrated 4, so that the activity meter to be calibrated 4 can measure the radioactive source and generate a measurement value; a control unit 3 obtains the measurement value; and the control unit 3 generates a calibration report template and an original record sheet of the activity meter to be calibrated 4 based on the measurement value.

[0136] Preferably, the ultrasonic distance measuring sensor 207 and the image acquisition device 206 are disposed adjacent to each other at the end of the mechanical arm 202 close to the work surface. The detection accuracy of the ultrasonic distance measuring sensor 207 can reach the millimeter level.

[0137] The activity meter to be calibrated 4 or the standard-grade activity meter can measure the radioactive source to obtain a measurement value corresponding to the radioactive source.

[0138] The activity meter to be tested 4 / standard-level activity meter with COM port communication function can send the measured value to the control unit 3. The measured value of the activity meter to be tested 4 / standard-level activity meter without COM port communication function can be acquired by the image acquirer 206 and sent to the control unit 3.

[0139] The specific process of the control unit 3 calculating the detection result based on the measured value can be implemented according to the relevant steps in JJG 377-2019 "Radioactivity Meter Calibration Procedure", so the specific process of the control unit 3 calculating the detection result based on the measured value will not be repeated here.

[0140] The control unit 3 can run the host computer software. The host computer software can customize the calibration process of the activity meter through programming. The host computer software can automatically execute the preset calibration steps based on the corresponding calibration standards, that is, the control unit 3 can control the transfer unit 2 and other related components to automatically complete all the calibration steps of the activity meter 4 to be calibrated, and the control unit 3 can also obtain the measurement value of the activity meter 4 to be calibrated for the radioactive source. The above-mentioned entire calibration process does not require manual intervention.

[0141] The communication interface of the host of some models of the activity meter to be calibrated 4 can obtain multiple measurement values ​​in sequence. The host of such activity meters is equipped with an RS232 interface, so the control unit 3 can communicate with the activity meter to be calibrated 4 through a single-chip microcomputer or a remote PC, and obtain the measurement value according to the communication protocol of the activity meter to be calibrated 4. In addition, for the activity meter to be calibrated / standard-level activity meter that cannot communicate, the image acquirer 206 can be used to take a picture of the host display interface of the activity meter to be calibrated / standard-level activity meter, and the taken picture is sent to the control unit 3 for OCR image recognition, and then the type of the radioactive source (i.e., nuclide), the measurement value and the unit of the measurement value are identified from the above picture.

[0142] For example, the specific verification process of the device can be:

[0143] 1) storing the detection tools 102 of multiple standard bottles containing radioactive sources in the storage space in the shielded lead chamber 101 respectively, waiting for the robot arm 202 to grab them;

[0144] 2) The robot arm 202 moves along the guide rail 201 to the vicinity of the shielding lead chamber 101 and begins to descend, so that the robot claw 203 can clamp the detection tooling 102 in the shielding lead chamber 101;

[0145] 3) After the mechanical claw 203 moves the detection tooling 102 out of the shielded lead chamber 101, the mechanical arm 202 moves along the guide rail 201 to the position of the first laser receiver 208 on the work surface, and the laser transmitter 205 at the end of the mechanical claw 203 emits laser light, which can pass through the vertical detection hole of the detection tooling 102 and be received by the laser receiver 208;

[0146] 4) The mechanical arm 202 moves along the guide rail 201 to a position corresponding to the calibration area of ​​the activity meter 4 to be calibrated, and the ultrasonic distance sensor 207 provided at the end of the mechanical arm 202 detects the activity meter 4 to be calibrated to generate detection information, and sends the detection information to the control unit 3;

[0147] 5) After the control unit 3 obtains the detection information of the ultrasonic ranging sensor 207 and the discrimination information of the laser receiver 208, the mechanical arm 202 and the mechanical claw 203 move the detection tooling 102 into the calibration area of ​​the activity meter 4 to be calibrated based on the detection information of the ultrasonic ranging sensor 207;

[0148] 6) The mechanical claw 203 carries the detection tooling 102 and rises to the highest point of the mechanical arm 202, and repeats steps 4 to 5 until the control unit 3 obtains the measurement values ​​of all the activity meters 4 to be calibrated for a certain bottle of radioactive source;

[0149] 7) The robot arm 202 returns to the position corresponding to the shielding chamber along the guide rail 201 so that the robot claw 203 returns to the top of the shielding lead chamber 101. Then, after the robot arm 202 descends to the specified height, it opens the robot claw 203 and puts the detection tooling 102 and the ampoule / vial containing the standard radioactive solution back into the porous shielding lead chamber 101;

[0150] 8) Repeat the operations in steps 2 to 7 until the measurement values ​​of the standard-grade activity meter and all the activity meters to be calibrated corresponding to all radioactive sources are obtained;

[0151] 9) The control unit 3 calculates the test results based on the measured values ​​and automatically generates a calibration report template and an original record sheet.

[0152] Preferably, the activity meters sent for inspection are mostly provided by various institutions. In view of the different brands, types, structures, shapes, and sizes of the activity meters used by various sources, especially the large number of existing activity meters that do not have a communication interface that can communicate with the control unit in this solution, in order to realize the unmanned detection environment that this device wants to achieve, it is necessary to perform image recognition on the screens above various activity meters to obtain the detection results. However, due to different brands, the positions of the display screens on the activity meters are quite different. This requires that during the preparation work before the calibration, the staff manually aligns the display screen of the activity meter with the image recognition unit in the above solution. However, due to the obstruction of the positioning tooling provided in this solution, the display screens of some activity meters may not be able to be read smoothly by the image recognition unit. In addition, the detection tooling contains radioactive substances, which are relatively dangerous. Using a mechanical arm to drive its movement still has certain hidden dangers. If it accidentally falls, bumps, or breaks, it will cause radioactive substances to leak and cause significant losses.

[0153] Based on the above, a preferred embodiment is given. In this embodiment, the transfer part is used to drive the activity meter to be calibrated to move, and the calibration tooling is fixed in a relative position. Specifically, the transfer part (for example, configured as a mechanical claw) is used to grab the activity meter to be calibrated, and the grabbing position can be designed at any position around the side of the activity meter to be calibrated. Except for the grabbed part, the remaining position of the activity meter can be exposed to the environment without being blocked by the field of vision. The above-mentioned grabbed part can be the ionization chamber of the activity meter. For some activity meter devices with integrated detection and display, the grabbed part can also be the entire activity meter. The mechanical claw can also be provided with a detector for detecting verticality and an ultrasonic detection device for detecting relative position. The detection tool is relatively fixed at a certain position, preferably, the position can be the inside of the above-mentioned shielding room, and the shielding room can be provided with an opening that matches the part or the whole structure of the activity meter to be grasped, so that under the drive of the transfer part, the activity meter can be sent into the shielding room to establish a detection connection with the detection tool, and the detection connection refers to the relative position relationship between the detection tool and the activity meter that can be detected. At the same time, based on the part of the activity meter that is not covered by the grasping unit of the transfer part and is exposed without being blocked by the field of vision, the image acquisition unit set at the robot arm or other positions can obtain the reading data on the display screen of the activity meter in a surrounding and unobstructed manner.

[0154] Preferably, since the ionization chamber is heavy (usually 16-20 kg) and has a smooth surface, it is difficult to grab and move it with a mechanical claw. In the present invention, a mobile platform can be used to replace the mechanical claw, which has a higher safety factor. Figure 6 shown.

[0155] Preferably, the activity meter is composed of an ionization chamber and an operating table, which are connected by a data cable. When moving one part, the length and winding of the data cable need to be considered, so the ionization chamber and the operating table move under the premise of keeping the relative position unchanged. The above scheme first solves the problem that it is difficult to obtain data collected by some activity meters. Through the movement of the mechanical claw, most of the positions of the activity meter are not blocked by the positioning tooling, and for the problem of poor visual field in certain positions, the transfer part can also solve it by controlling the activity meter to be transferred to a position with better visual field. At the same time, the activity meter itself can also be rotated circumferentially and axially by the mechanical claw to display its display screen in the acquisition field of view of the image acquisition unit in a more easily readable manner, so that the device can adapt to more and more comprehensive calibration objects. In addition, the safe use of the detection tooling is achieved. In this embodiment, the detection tooling itself does not need to perform any movement, and preferably, it can also be placed in the shielding management unit, which greatly reduces the probability of the detection tooling being dropped, bumped, or broken due to movement, thereby causing a radioactive material leakage accident. At the same time, it also weakens the escape of some radioactive rays, so that the overall environmental safety can be further improved. At the same time, the method of moving the activity meter to be calibrated is selected so that the device has more adjustment freedom for various types of activity meters. Due to the variety of types of activity meters, the structures of the sample inlet, the collection part, etc. may not be consistent or even similar. Compared with the standard structure, mass, and volume detection tooling that can be used by the device, how to form the sample injection, detection, data display and other processes suitable for the activity meter is more complicated. Therefore, the scheme is based on the method of using a multi-degree-of-freedom mechanical arm to drive the activity meter to move freely, which can give more adjustment space for the calibration of various activity meters, so as to achieve the calibration effect for various activity meters and improve the scope of application and flexibility of use of the device.

[0156] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention specification and its drawings are illustrative and do not constitute a limitation on the claims. The scope of protection of the present invention is defined by the claims and their equivalents. The present invention specification contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", all of which indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept.

Claims

1. An intelligent automatic calibration device based on an activity meter, characterized in that: At least: A shielding management unit (1) is configured to perform shielding management on a standard bottle containing a radioactive source, so as to prevent the radioactive source from causing harm to the health of a tester; The transfer unit (2) is configured to move the standard bottle from the shielding management unit (1) capable of accommodating a plurality of detection tools (102) to a calibration area of ​​the activity meter to be calibrated (4), so that the activity meter to be calibrated (4) can measure the radioactive source and generate a measurement value; A control unit (3), capable of at least obtaining the measurement value; in, In the case where the control unit (3) is able to obtain identification information related to the activity meter (4) to be calibrated, the control unit (3) is configured to generate a calibration report template and an original record sheet of the activity meter (4) to be calibrated based on the measurement value, and control the transfer unit (2) based on the identification information to improve the accuracy of the calibration report template and the original record sheet; The detection tool (102) corresponding to the to-be-calibrated area of ​​the to-be-calibrated activity meter (4) can send a data request to the positioning tool (209) corresponding to the to-be-calibrated area, and a plurality of fixed-position positioning tools (209) are evenly distributed on the work surface along an axial direction parallel to the guide rail (201), and the positioning tool (209) can at least fix a partial area of ​​the to-be-calibrated activity meter (4) on the work surface. The positioning tool (209) is capable of acquiring the data request and forwarding the data request sent by the detection tool (102) to the control unit (3); and the control unit (3) acquires identification information corresponding to the data request based on the data request sent by the detection tool (102).

2. The device according to claim 1, characterized in that The shielding management unit (1) comprises at least a shielding lead chamber (101) and a detection tool (102), wherein the shielding lead chamber (101) is provided with at least one storage space for storing the detection tool (102), and the detection tool (102) is constructed as a holder for the standard bottle containing the radioactive source, wherein at least a portion of the detection tool (102) can be stored in the storage space and forms a sealed whole with the storage space, so as to effectively reduce the health risk of the radioactive source stored in the storage space to the calibration personnel.

3. The device according to claim 2, characterized in that The transfer unit (2) is composed of a guide rail (201), a mechanical arm (202) and a mechanical claw (203); the guide rail (201), the mechanical arm (202) and the mechanical claw (203) can all be controlled by the control unit (3); the control unit (3) can issue action instructions to the guide rail (201), the mechanical arm (202) and the mechanical claw (203) respectively, wherein the guide rail (201), the mechanical arm (202) and the mechanical claw (203) can move based on the action instructions to transfer the standard bottle containing the radioactive source from the shielding management unit (1) to the calibration area of ​​the activity meter (4) to be calibrated.

4. The device according to claim 3, characterized in that When the transfer unit (2) transfers the radioactive source in the detection tooling (102), the image acquisition device (206) arranged on the mechanical arm (202) can capture and identify the measurement value on the display interface of the activity meter (4) to be calibrated, and record the identified measurement value as original calibration data in the calibration report template and / or the original record table.

5. The device according to claim 4, characterized in that The mechanical claw (203) is provided with a laser transmitter (205), and the work surface on which the guide rail (201) is located is provided with a laser receiver (208), so as to detect the verticality of the detection tool (102) during the process of being transferred by the mechanical claw (203) through the laser transmitter (205) and the laser receiver (208).

6. The device according to claim 5, characterized in that At least one vertical detection hole is provided on the skirt structure of the detection tool (102), so that the laser emitted by the laser transmitter (205) can pass through the vertical detection hole and be received by the laser receiver (208) located on the work surface.

7. The device according to claim 6, characterized in that An ultrasonic distance measuring sensor (207) is also provided at the end of the mechanical arm (202) close to the work surface. The ultrasonic distance measuring sensor (207) is capable of detecting the activity meter (4) to be calibrated located on the work surface and obtaining detection information, wherein the ultrasonic distance measuring sensor (207) is capable of sending the detection information to the control unit (3).

8. The device according to claim 7, characterized in that The control unit (3) can obtain the detection information of the ultrasonic distance sensor (207) and the discrimination information of the laser receiver (208), and the control unit (3) can move the detection tool (102) into the calibration area of ​​the activity meter to be calibrated (4) or the standard-level activity meter through the mechanical arm (202) and the mechanical claw (203) based on the detection information of the ultrasonic distance sensor (207).

9. A method for using the intelligent automatic calibration device based on an activity meter according to any one of claims 1 to 8, characterized in that: The method comprises: The shielding management department (1) performs shielding management on standard bottles containing radioactive sources; The transfer unit (2) automatically moves the standard bottle from the shielding management unit (1) to the calibration area of ​​the activity meter (4) to be calibrated, so that the activity meter (4) to be calibrated can measure the radioactive source and generate a measurement value; The control unit (3) obtains the measured value; The control unit (3) generates a calibration report template and an original record table for the activity meter (4) to be calibrated based on the measured value.

Images