System and method for detecting radioactive shielding capability of container

Abstract

The invention provides a system for detecting the radioactive shielding capability of a container, which comprises a standard radiation field generating device, a container attitude adjusting device, a container loading device and a measuring device, and is characterized in that the standard radiation field generating device is configured to generate a controllable and standard radiation field; the container loading device conveys the container to the container posture adjusting device; the container posture adjusting device is used for adjusting the posture of the container; the measuring device comprises a measuring probe, and the measuring probe enters a specified measuring position in the container during measurement to measure the dosage rate in the container. The invention also provides a method for detecting the radioactive shielding capability of the container by using the system. The system and the method are used for detecting the shielding capability of the small radioactive sample transfer container, and detection work can be completed without radioactive source guiding work.

Description

Technical Field

[0001] The present invention relates to the field of radiation protection application technology, and specifically to a system and method for detecting the radiation shielding capability of a container, especially a container for transporting small radioactive samples. The present invention can detect the shielding capability of a small radioactive sample transport container after manufacture, and ensure that the shielding capability of the transport container reaches the design index. Background Art

[0002] During the operation of nuclear facilities and nuclear-related laboratories, radioactive materials need to be transported within the plant and the laboratory. To ensure the safety of the staff, the radioactive materials must be loaded into shielding containers with good shielding capabilities for transportation. If the shielding capacity of the shielding container does not meet the design requirements due to manufacturing defects, there may be problems such as beam leakage during the transportation of radioactive materials, which will cause great harm to the staff. Therefore, the shielding capacity of the container used for the transportation of radioactive materials must be tested after manufacturing to detect whether the shielding capacity of the relevant transportation container meets the design requirements, so as to avoid harm to the staff.

[0003] At present, the mainstream detection method requires that the radiation source be introduced into the container during detection, and the dose rate be detected outside the container using a dosimeter. The shielding equivalent is deduced based on the internal radiation source source parameters and the measured dose value outside the container, and then it is determined whether the shielding capacity of the container meets the design requirements. This method is intuitive and reliable, but because it involves the work of guiding the radiation source, it is costly and has high risks.

[0004] In view of the above problems, it is urgent to develop a system and method for detecting the shielding capability of small radioactive sample transport containers, so that it can be used to detect the shielding capability of small radioactive sample transport containers, and the detection work can be completed without the need for radiation source guidance work. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a system for detecting the radiation shielding capability of a container, which is used for detecting the shielding capability of a small radioactive sample transport container and can complete the detection work without performing radiation source guidance work.

[0006] To achieve the above object, in a first aspect of the present invention, a system for detecting the radiation shielding capability of a container is provided, comprising a standard radiation field generating device, a container posture adjusting device, a container loading device and a measuring device, wherein:

[0007] The standard radiation field generating device is configured to generate a controllable and standard radiation field, and includes an internal radiation source, a source compartment, an internal radiation source lifting mechanism, a radiation exit port, and a radiation exit shutter;

[0008] The container loading device is configured to transport the container to the container posture adjustment device;

[0009] The container posture adjustment device is located on one side of the ray outlet of the standard radiation field generating device, and is configured to perform posture adjustment on the container so that it is in a detection position, wherein the posture adjustment includes horizontal position adjustment, vertical position adjustment, longitudinal position adjustment and rotation around the axis of the container. At the detection position, the crosshair of the standard radiation field generating device is aligned with the detection point marked on the container;

[0010] The measuring device comprises a measuring probe, which is configured to enter a designated measuring position inside the container during measurement to measure the dose rate inside the container, wherein the designated measuring position is a position inside the container corresponding to the detection point.

[0011] In an implementation of the first aspect, the standard radiation field generating device controls the raising and lowering of an internal radiation source of the standard radiation field generating device and the opening and closing of a ray exit shutter through remote control, thereby realizing the opening and closing of the radiation field.

[0012] In the implementation of the first aspect, the container posture adjustment device includes a horizontal lateral distance adjustment component, a horizontal longitudinal distance adjustment component, a height adjustment component, and a rotation adjustment component, wherein:

[0013] The horizontal lateral distance adjustment assembly is configured to achieve horizontal lateral displacement of the container;

[0014] The horizontal longitudinal distance adjustment assembly is configured to achieve horizontal longitudinal displacement of the container, the horizontal longitudinal distance adjustment assembly being attached to the horizontal lateral distance adjustment assembly;

[0015] The height adjustment assembly is configured to achieve height adjustment of the container, the height adjustment assembly being attached to the horizontal longitudinal distance adjustment assembly;

[0016] The rotation adjustment assembly is configured to rotate the container around its rotation axis, and the rotation adjustment assembly is attached to the height adjustment assembly.

[0017] In an embodiment of the first aspect, the horizontal lateral distance adjustment assembly includes a horizontal lateral track, a track wheel, a base, and a drive motor, wherein a track wheel that can roll and move along the horizontal lateral track is installed at the bottom of the base.

[0018] The horizontal longitudinal distance adjustment component includes a horizontal longitudinal track, a slider, an electric ball screw assembly and a loading table. The horizontal longitudinal track is installed on the base, the slider is connected to the loading table, and the electric ball screw assembly is arranged at the central bottom position of the loading table.

[0019] In an embodiment of the first aspect, the height adjustment assembly is installed on the loading table, the height adjustment assembly includes a lifting mechanism and a mounting table, and the mounting table is installed on the lifting mechanism.

[0020] The rotation adjustment component is installed on the installation table, and the rotation adjustment component includes an active roller bracket and a driven roller bracket, wherein the active roller bracket and the driven roller bracket both include a roller and a bracket for fixing the roller rotation axis.

[0021] In the implementation of the first aspect, the container loading device includes a right-angle support arm, a rotating joint, a universal travel wheel, a travel electric hoist, and a fixing rod, wherein:

[0022] One end of the fixing rod is vertically fixed to the side of the mounting table, and the other end is attached to the rotating joint, and the rotating joint is also attached to the horizontal end of the right-angle support arm, so that the right-angle support arm can rotate horizontally around the rotating joint;

[0023] The universal travel wheel is installed at the vertical end of the right-angle support arm;

[0024] The electric hoist is slidably attached to the horizontal arm portion of the right-angle support arm via its travel wheels.

[0025] In an embodiment of the first aspect, the length of the horizontal arm portion of the right-angle support arm is designed so that the right-angle support arm can perform 360-degree obstacle-free rotation around the rotation joint without interfering with the container posture adjustment device.

[0026] In an embodiment of the first aspect, the measuring device comprises a measuring probe, a retractable probe support rod, a support rod mounting plate, a sliding assembly, a main frame and a measuring recorder, wherein:

[0027] The support rod mounting plate is attached to the main frame, and its positioning height is designed to be within the height range defined by the contour of the container to be inspected;

[0028] The measuring probe is mounted on the retractable probe support rod;

[0029] The retractable probe support rod is fixed to a sliding member in the sliding assembly;

[0030] The fixing member in the sliding assembly is mounted on the support rod mounting plate;

[0031] The measurement recorder communicates wirelessly with the measurement probe to record the radiation dose value measured by the measurement probe.

[0032] During measurement, the measuring probe is inserted into the detection point inside the container, and the dose rate after shielding is measured at any depth position inside the container.

[0033] In a second aspect of the present invention, a method for detecting the radiation shielding capability of a container using the above-mentioned system for detecting the radiation shielding capability of a container is provided, comprising the following steps:

[0034] Grid division: before testing, the container surface is grid-divided, and the grid intersections form the points to be tested;

[0035] Loading the container to be tested: pushing the container into the laboratory, operating the container loading device, and lifting the container from the transfer trolley to the container posture adjustment device;

[0036] Posture adjustment before measurement: turn on the crosshairs of the standard radiation field generating device, and use the container posture adjustment device to adjust the posture of the container so that the point to be tested of the container is aligned with the crosshairs;

[0037] Adjustment of the measuring probe: by moving the measuring device and adjusting the depth of the probe inside the container to be tested, the measuring probe of the measuring device is adjusted to the corresponding point on the inner wall of the container after the gamma ray penetrates the container in a straight line, that is, the dose rate measurement point after shielding;

[0038] Measurement and recording: Personnel evacuate to a safe area, open the shutter of the standard radiation field generating device according to the operating procedures, emit gamma rays to the point to be measured, and at the same time, the measuring device records the radiation dose value measured at the dose rate measurement point after shielding;

[0039] After the radiation dose value of the current point to be detected is measured, the shutter of the standard radiation field generating device is closed, and the posture of the container to be detected is adjusted so that the crosshairs of the standard radiation field generating device are aligned with the next detection point of the container, and the following steps are repeated: posture adjustment before measurement, adjustment of the measuring probe, and measurement and recording, and finally the dose rate in the container to be detected corresponding to all the points to be detected is obtained;

[0040] According to the radiation source type, average energy, incident dose rate and dose rate in the container to be inspected of the standard radiation field generating device, it is determined whether there are weak points in the radioactive shielding of the container to be inspected.

[0041] In an embodiment of the second aspect, the step of determining whether the container to be inspected has a weak point in the radioactive shielding includes comparing the dose rates in the container corresponding to all the points to be inspected with the theoretical dose rates corresponding to each of them. Taking into account the error, if the dose rate in the container corresponding to any point to be inspected is greater than its corresponding theoretical dose rate, it is considered that the container has a weak point, wherein the calculation formula of the theoretical dose rate is as follows:

[0042]

[0043] Where N0 is the number of photons after the ray passes through the container, N is the number of photons before the ray passes through the container, ρ is the density of the container; μ is the line attenuation coefficient, d m is the mass thickness of the container, which is equal to d·ρ; μ / ρ represents the mass attenuation coefficient of the container for photons of a specific energy, in units of m 2 / kg.

[0044] The system and method for detecting the radiation shielding capability of a container of the present invention have the following beneficial effects compared with the prior art:

[0045] (1) The present invention uses a standard radiation field generating device, avoids the use of a radiation source, and thus avoids the work of guiding the radiation source;

[0046] (2) The standard radiation field generating device can generate a controllable and standard standard radiation field, and the operation is controllable and safe;

[0047] (3) The system has a modular structure, which is easy to disassemble and assemble, and can be transported and disassembled in different laboratories;

[0048] (4) A container loading device that can conveniently and reliably load the container to be inspected onto the container posture adjustment device without the need for other lifting devices;

[0049] (5) The container posture adjustment device can adjust the spatial posture of the container to be inspected, and can align any point of the container to be tested with the ray exit port, thereby completing the detection of the shielding performance of any point of the container. The operation is simple, safe and reliable.

[0050] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0052] Figure 1A schematic diagram of a system for detecting the radiation shielding capability of a container according to an embodiment of the present invention;

[0053] Figure 2 is a schematic diagram of a horizontal lateral distance adjustment component;

[0054] Figure 3 is a schematic diagram of a horizontal longitudinal distance adjustment component;

[0055] Figure 4 This is a schematic diagram of the unfolded state of the height adjustment component;

[0056] Figure 5 This is a cross-sectional view of the ball screw mounting seat;

[0057] Figure 6 A schematic diagram of a container loading device and a measuring device is shown. DETAILED DESCRIPTION

[0058] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0059] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0060] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0061] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more". "Plurality" should be understood as two or more.

[0062] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0063] Figure 1A schematic diagram of a system for detecting the radiation shielding capability of a container according to the present invention is shown, comprising Figure 1 It can be seen that the system for detecting the radioactive shielding capability of a container of the present invention comprises a standard radiation field generating device 10, a container posture adjusting device 20, a container loading device 30 and a measuring device 40, wherein the standard radiation field generating device 10 is configured to generate a controllable and standard radiation field.

[0064] The container posture adjustment device 20 is located on the side of the ray emission port of the standard radiation field generating device 10. The container loading device 30 is used to transport the container to be inspected to the container posture adjustment device 20. The container posture adjustment device 20 is used to adjust the posture of the container to be inspected so that it is in the inspection position. It should be noted that the posture adjustment includes horizontal position adjustment, vertical position adjustment, longitudinal position adjustment and rotation around the axis of the container to be inspected; the measuring device 40 is used to move to the measuring position inside the container to be inspected after the container to be inspected is in the inspection position and the inspection is turned on, and detect the radiation amount (dose rate) inside the container to be inspected.

[0065] It is worth noting that, at present, the mainstream method for testing the radioactive shielding capability of radioactive sample transport containers requires the use of a radioactive source, which is guided into the container during testing, and a dosimeter is used to detect the dose rate outside the container. Since it involves the work of guiding the radioactive source, it is costly and risky.

[0066] The present invention uses a standard radiation field generating device 10, which avoids the use of a radiation source, thereby avoiding the radiation source guiding work. The standard radiation field generating device 10 is configured to generate detection radiation, and the standard radiation field generating device 10 includes a radiation outlet.

[0067] The standard radiation field generating device 10 is a device that can generate a controllable and standard radiation field, and can be selected as a gamma-ray air kerma standard device, or other standard radiation field generating devices, as long as it can generate a standard radiation field. It is understandable that the standard radiation field generating device 10 can be, for example, an X-ray machine.

[0068] The standard radiation field generating device 10 includes an internal radiation source, a source bin, an internal radiation source lifting mechanism, a radiation exit port and a radiation exit shutter. When not started, the internal radiation source is enclosed in the source bin; when the standard radiation field generating device 10 is started, the internal radiation source lifting mechanism moves the internal radiation source from the source bin to a specified position and generates radiation, the radiation exit shutter opens, and the radiation is radiated to the container to be inspected through the radiation exit port.

[0069] The standard radiation field generating device 10 can realize the raising and lowering of the internal radiation source and the opening and closing of the ray emission shutter of the standard radiation field generating device through remote control, thereby controlling the opening and closing of the radiation field.

[0070] When the standard radiation field generating device 10 is selected as a gamma-ray air kerma standard device, the gamma-ray air kerma standard device generates a strong gamma 60 The Co standard radiation field makes gamma rays irradiate the designated position of the container from the outside of the container, that is, the point to be detected, where the point to be detected is formed by gridding the surface of the container.

[0071] The container posture adjustment device 20 includes a horizontal transverse distance adjustment component, a horizontal longitudinal distance adjustment component, a height adjustment component, and a rotation adjustment component, wherein:

[0072] The horizontal lateral distance adjustment component is used to achieve the horizontal lateral displacement of the container to be inspected. Figure 2 As shown, the horizontal lateral distance adjustment component includes a horizontal lateral track 211, a track wheel 212, a base 213, and a driving motor (not shown), wherein the track wheel 212 is installed at the bottom of the base 213, and the track wheel 212 rolls along the horizontal lateral track 211.

[0073] A horizontal longitudinal distance adjustment component is installed on the base 213 of the horizontal transverse distance adjustment component to achieve horizontal longitudinal displacement of the container to be inspected. Figure 3 As shown, the horizontal longitudinal distance adjustment component includes a horizontal longitudinal track 221, a slider 222, an electric ball screw assembly 223 and a loading table 224, wherein the horizontal longitudinal track 221 is installed on the top plate of the base 213, the slider 222 is slidably fitted on the horizontal longitudinal track 221, the bottom surface of the loading table 224 is fixedly connected to the top surface of the slider 222, and the electric ball screw assembly 223 is arranged at the central bottom position of the loading table 224, as shown in FIG. Figure 5 As shown, the electric ball screw assembly 223 includes a ball screw 223A and a screw slider 223B. The ball screw 223A rotates forward or reversely under the drive of the motor, driving the screw slider 223B to reciprocate, thereby realizing the reciprocating movement of the loading table 224 along the horizontal and longitudinal directions.

[0074] The height adjustment assembly is mounted on the loading table 224 of the horizontal and longitudinal distance adjustment assembly to adjust the height of the container to be inspected. Figure 4 As shown, the height adjustment component includes a lifting mechanism 231 and a mounting table 232. Preferably, the lifting mechanism 231 can be a hydraulic scissor-type lifting mechanism. By lifting and lowering the lifting mechanism 231, the height of the center line of the container to be inspected from the ground is adjusted to ensure that the center line of the container to be inspected and the ray outlet are located in the same horizontal plane.

[0075] The rotation adjustment component is installed on the mounting table 232 of the height adjustment component, and is used to rotate the container to be inspected around its rotation axis, including an active roller bracket 241 and a driven roller bracket 242. A plurality of sets of mounting threaded holes are installed on the mounting table 232 of the height adjustment component, and the active roller bracket and the driven roller bracket can adjust the direction and distance according to the inspection position requirements of the container to be inspected. The container is driven to rotate forward and reversely by the forward and reverse rotation of the roller in the active roller bracket, thereby completing the rotation movement of the container around its axis.

[0076] Through the coordinated action of the rotating unit, the height adjusting unit, the longitudinal adjusting unit and the horizontal adjusting unit, the posture of the container to be inspected can be adjusted to the inspection position.

[0077] Figure 6 A container loading device is shown, such as Figure 6 As shown, the container loading device 30 includes a right-angle support arm 301, a rotating joint 302, a universal wheel 303, an electric hoist 304, and a fixed rod 305, wherein one end of the fixed rod 305 is vertically fixed to the side of the mounting table 232, and the other end of the fixed rod 305 is attached to the rotating joint 302, and the rotating joint is also attached to the horizontal end of the right-angle support arm 301, so that the right-angle support arm 301 can rotate horizontally around the rotating joint 302. The universal wheel 303 is installed at the vertical end of the right-angle support arm 301. When the right-angle support arm 301 rotates horizontally around the rotating joint 302, the universal wheel 303 rolls along the ground, which can support the right-angle support arm 301 and reduce friction. The electric hoist 304 is slidably attached to the horizontal arm of the right-angle support arm 301 through its own wheel, and can travel in a straight line along the horizontal arm of the right-angle support arm 301 and can complete the lifting and lowering of the container to be inspected.

[0078] It should be noted that the length of the horizontal arm portion of the right-angle support arm 301 is designed so that the right-angle support arm 301 can make a 360-degree unobstructed rotation movement around the rotating joint 302, that is, its length is designed to be long enough so that the right-angle support arm 301 can avoid the container posture adjustment device 20 when rotating around the rotating joint 302, and will not interfere with the components of the container posture adjustment device 20.

[0079] It is understandable that the container to be inspected can be moved to the two sets of roller brackets of the container posture adjustment device 20 through the container loading device 30, so as to perform subsequent adjustment work.

[0080] like Figure 6As shown, the measuring device 40 includes a measuring probe, a probe support rod 401, a support rod mounting plate 402, a sliding assembly 403, a main frame 404 and a measuring recorder. The support rod mounting plate 402 is attached to the main frame 404, and its positioning height is designed to be located within the height range defined by the contour of the container to be detected. The measuring probe is installed on the probe support rod 401, the probe support rod 401 is retractable, the probe support rod 401 is fixed to the sliding member in the sliding assembly 403, and the fixing member in the sliding assembly 403 is installed on the support rod mounting plate 402. The sliding assembly 403 can realize the reciprocating motion of the probe support rod 401 along the surface of the support rod mounting plate 402, so that the measuring probe is deeply inserted into the detection point inside the container to be detected during measurement in combination with the retractability of the probe support rod 401, thereby completing the post-shielding dose rate measurement task at any depth position.

[0081] The measurement recorder communicates wirelessly with the measurement probe and records the radiation dose value measured by the measurement probe.

[0082] When the system for detecting the radiation shielding capability of a container of the present invention is used to detect the radiation shielding capability of a small radioactive sample transport container, the method used is as follows:

[0083] Grid division: Before testing, the surface of the container to be tested is grid-divided. For example, a 5cm×5cm grid is divided on the surface of the container to be tested, and the intersection of the grids forms the points to be tested;

[0084] Loading the container to be tested: Push the container to be tested into the laboratory, operate the container loading device, and use the electric hoist to lift the container to be tested from the transfer trolley to the roller bracket of the container posture adjustment device;

[0085] Posture adjustment before measurement: turn on the crosshairs of the standard radiation field generating device, and use the container posture adjustment device to adjust the posture of the container to be tested so that the test point of the container to be tested is aligned with the crosshairs;

[0086] Adjustment of the measuring probe: by moving the measuring device and adjusting the depth of the probe inside the container to be tested, the measuring probe of the measuring device is adjusted to the corresponding point on the inner wall of the container after the gamma ray penetrates the container in a straight line, that is, the dose rate measurement point after shielding;

[0087] Measurement and recording: Personnel evacuate to a safe area, open the shutter of the standard radiation field generating device according to the operating procedures, emit gamma rays to the point to be measured, and at the same time, the measuring device records the radiation dose value measured at the dose rate measurement point after shielding;

[0088] After the measurement of the current point to be detected is completed, the shutter of the standard radiation field generating device is closed, and the posture of the container to be detected is adjusted so that the crosshairs of the standard radiation field generating device are aligned with the next detection point of the container to be detected, and the following steps are repeated: posture adjustment before measurement, adjustment of the measuring probe, and measurement and recording, and finally the dose rate in the container to be detected corresponding to all the points to be detected is obtained.

[0089] According to the radiation source type, average energy, incident dose rate and dose rate in the container to be tested of the standard radiation field generating device, determine whether there is a weak point in the radioactive shielding of the container to be tested: compare the dose rates in the container to be tested corresponding to all the points to be tested with their corresponding theoretical dose rates. If the dose rate in the container to be tested corresponding to any point to be tested is greater than its corresponding theoretical dose rate, it is considered that there is a weak point in the container to be tested. The calculation formula of the theoretical dose rate is as follows:

[0090]

[0091] Where N0 represents the number of photons after the ray passes through the container to be detected, N represents the number of photons before the ray passes through the container to be detected, ρ is the density of the container to be detected; μ is the line attenuation coefficient, d m is the mass thickness of the container to be tested, which is equal to d·ρ; μ / ρ represents the mass attenuation coefficient of the container to be tested for photons of a specific energy, in units of m 2 / kg.

[0092] The process of loading the container to be tested is as follows: after the container to be tested is pushed into the laboratory, the container loading device is rotated and the traveling electric hoist is pulled to move until it is above the container to be tested, the traveling electric hoist hook is lowered to connect the lifting rope installed in advance on the container to be tested, the traveling electric hoist lifts the container to be tested, the transfer cart is withdrawn, and then the container to be tested is lifted to the loading height, the electric hoist is pulled to move to the top of the container posture adjustment device, the electric hoist lowers the container to the roller bracket above the container posture adjustment device, and the electric hoist is withdrawn to complete the loading of the container to be tested.

[0093] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for detecting the radiation shielding capability of a container, comprising a standard radiation field generating device, a container posture adjusting device, a container loading device and a measuring device, wherein: The standard radiation field generating device is configured to generate a controllable and standard radiation field, and includes an internal radiation source, a source compartment, an internal radiation source lifting mechanism, a radiation exit port, and a radiation exit shutter; The container loading device is configured to transport the container to the container posture adjustment device; The container posture adjustment device is located on one side of the ray outlet of the standard radiation field generating device, and is configured to perform posture adjustment on the container so that it is in a detection position, wherein the posture adjustment includes horizontal position adjustment, vertical position adjustment, longitudinal position adjustment and rotation around the axis of the container. At the detection position, the crosshair of the standard radiation field generating device is aligned with the detection point marked on the container; The measuring device comprises a measuring probe, which is configured to enter a designated measuring position inside the container during measurement to measure the dose rate inside the container, wherein the designated measuring position is a position inside the container corresponding to the detection point.

2. The system for detecting the radiation shielding capability of a container according to claim 1, characterized in that: The standard radiation field generating device controls the lifting and lowering of the internal radiation source of the standard radiation field generating device and the opening and closing of the ray emission shutter through remote control, thereby realizing the opening and closing of the radiation field.

3. The system for detecting the radiation shielding capability of a container according to claim 1, characterized in that: The container posture adjustment device includes a horizontal transverse distance adjustment component, a horizontal longitudinal distance adjustment component, a height adjustment component, and a rotation adjustment component, wherein: The horizontal lateral distance adjustment assembly is configured to achieve horizontal lateral displacement of the container; The horizontal longitudinal distance adjustment assembly is configured to achieve horizontal longitudinal displacement of the container, the horizontal longitudinal distance adjustment assembly being attached to the horizontal lateral distance adjustment assembly; The height adjustment assembly is configured to achieve height adjustment of the container, the height adjustment assembly being attached to the horizontal longitudinal distance adjustment assembly; The rotation adjustment assembly is configured to rotate the container around its rotation axis, and the rotation adjustment assembly is attached to the height adjustment assembly.

4. The system for detecting the radiation shielding capability of a container according to claim 3, characterized in that: The horizontal lateral distance adjustment assembly includes a horizontal lateral track, a track wheel, a base, and a driving motor, wherein the bottom of the base is provided with a track wheel that can roll and move along the horizontal lateral track. The horizontal longitudinal distance adjustment component includes a horizontal longitudinal track, a slider, an electric ball screw assembly and a loading table. The horizontal longitudinal track is installed on the base, the slider is connected to the loading table, and the electric ball screw assembly is arranged at the central bottom position of the loading table.

5. The system for detecting the radiation shielding capability of a container according to claim 4, characterized in that: The height adjustment assembly is installed on the loading table, and the height adjustment assembly includes a lifting mechanism and a mounting table, and the mounting table is installed on the lifting mechanism. The rotation adjustment component is installed on the installation table, and the rotation adjustment component includes an active roller bracket and a driven roller bracket, wherein the active roller bracket and the driven roller bracket both include a roller and a bracket for fixing the roller rotation axis.

6. The system for detecting the radiation shielding capability of a container according to claim 5, characterized in that: The container loading device includes a right-angle support arm, a rotating joint, a universal travel wheel, a travel electric hoist, and a fixing rod, wherein: One end of the fixing rod is vertically fixed to the side of the mounting table, and the other end is attached to the rotating joint, and the rotating joint is also attached to the horizontal end of the right-angle support arm, so that the right-angle support arm can rotate horizontally around the rotating joint; The universal travel wheel is installed at the vertical end of the right-angle support arm; The electric hoist is slidably attached to the horizontal arm portion of the right-angle support arm via its travel wheels.

7. The system for detecting the radiation shielding capability of a container according to claim 6, characterized in that: The length of the horizontal arm portion of the right-angle support arm is designed so that the right-angle support arm can perform 360-degree obstacle-free rotation around the rotation joint without interfering with the container posture adjustment device.

8. The system for detecting the radiation shielding capability of a container according to claim 4, characterized in that: The measuring device comprises a measuring probe, a retractable probe support rod, a support rod mounting plate, a sliding assembly, a main frame and a measuring recorder, wherein: The support rod mounting plate is attached to the main frame, and its positioning height is designed to be within the height range defined by the contour of the container to be inspected; The measuring probe is mounted on the retractable probe support rod; The retractable probe support rod is fixed to a sliding member in the sliding assembly; The fixing member in the sliding assembly is mounted on the support rod mounting plate; The measurement recorder communicates wirelessly with the measurement probe to record the radiation dose value measured by the measurement probe. During measurement, the measuring probe is inserted into the detection point inside the container, and the dose rate after shielding is measured at any depth position inside the container.

9. A method for detecting the radiation shielding capability of a container using the system for detecting the radiation shielding capability of a container according to any one of claims 1 to 8, comprising the following steps: Grid division: before testing, the container surface is grid-divided, and the grid intersections form the points to be tested; Loading the container to be tested: pushing the container into the laboratory, operating the container loading device, and lifting the container from the transfer trolley to the container posture adjustment device; Posture adjustment before measurement: turn on the crosshairs of the standard radiation field generating device, and use the container posture adjustment device to adjust the posture of the container so that the point to be tested of the container is aligned with the crosshairs; Adjustment of the measuring probe: by moving the measuring device and adjusting the depth of the probe inside the container to be tested, the measuring probe of the measuring device is adjusted to the corresponding point on the inner wall of the container after the gamma ray penetrates the container in a straight line, that is, the dose rate measurement point after shielding; Measurement and recording: Personnel evacuate to a safe area, open the shutter of the standard radiation field generating device according to the operating procedures, emit gamma rays to the point to be measured, and at the same time, the measuring device records the radiation dose value measured at the dose rate measurement point after shielding; After the radiation dose value of the current point to be detected is measured, the shutter of the standard radiation field generating device is closed, and the posture of the container to be detected is adjusted so that the crosshairs of the standard radiation field generating device are aligned with the next detection point of the container, and the following steps are repeated: posture adjustment before measurement, adjustment of the measuring probe, and measurement and recording, and finally the dose rate in the container to be detected corresponding to all the points to be detected is obtained; According to the radiation source type, average energy, incident dose rate and dose rate in the container to be inspected of the standard radiation field generating device, it is determined whether there are weak points in the radioactive shielding of the container to be inspected.

10. According to the method of claim 9, the step of determining whether the container to be inspected has a weak point in the radioactive shielding comprises comparing the dose rates in the container corresponding to all the points to be inspected with the theoretical dose rates corresponding to each of them, and taking into account the error, if the dose rate in the container corresponding to any point to be inspected is greater than its corresponding theoretical dose rate, it is considered that the container has a weak point, wherein: The theoretical dose rate is calculated as follows: Where N0 is the number of photons after the ray passes through the container, N is the number of photons before the ray passes through the container, ρ is the density of the container; μ is the line attenuation coefficient, d m is the mass thickness of the container, which is equal to d·ρ; μ / ρ represents the mass attenuation coefficient of the container for photons of a specific energy, in units of m 2 / kg.

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