A method for designing a radiation shield for concrete x-ray inspection

Abstract

This invention discloses a radiation shield design method for X-ray inspection of concrete, belonging to the field of radiation protection technology. The method includes: acquiring and establishing a basic model of multiple exposure conditions and candidate shielding structures; calculating the comprehensive correlation between conditions and grouping tasks to establish corresponding shielding states; establishing a ray path diagram for each task group, including the main ray, scattered rays, and leakage rays; calculating the cumulative leakage risk based on the path diagram and generating joint topological constraints and functional opening layout limitations; thereby forming a complete shielding product including source-side, receiver-side, local reinforcement, module joints, and functional opening shielding structures; and performing parameter correction and verification closed-loop through on-site dose residual analysis. This invention can accurately adapt to the needs of multi-condition inspection, significantly improving the reliability of shielding design and the safety of inspection.

Description

Technical Field

[0001] This invention relates to the field of radiation shielding technology, and in particular to a design method for a radiation shield for X-ray inspection of concrete. Background Technology

[0002] X-ray inspection of concrete is a key method for assessing the condition of internal steel bars, holes and cracks in structures such as bridges and utility poles. Actual inspections often involve a large number of exposures from multiple angles and with multiple parameters.

[0003] However, existing shielding designs often determine thickness based on a single maximum operating condition, failing to consider the cumulative effects of radiation source location, irradiation direction, and exposure frequency under different operating conditions. This leads to an underestimation of local leakage risk or excessive redundancy in the overall design. To reduce radiation leakage, existing technologies also construct modular shielding covers using materials such as lead plates and tungsten composite plates. They weaken radiation penetration at the joints through plate overlaps, staggered joints, and joint covering layers, and verify the effectiveness through on-site dose measurements after installation. However, the joint positions and functional opening layouts of the shielding modules are not designed in conjunction with the actual multi-condition radiation propagation paths. Joints and openings may be located precisely on high-risk paths or even form continuous low-shield channels, resulting in poor shielding effectiveness. Solving this problem is the core of this application, which involves constructing a radiation path diagram, calculating cumulative leakage risk, and generating joint topological constraints and opening arrangement limitations. Summary of the Invention

[0004] To address the problem that existing shielding modules lack design considerations for seam locations and functional opening layouts in relation to actual X-ray propagation paths under various operating conditions, resulting in poor shielding effectiveness due to seams and openings potentially being located on high-risk paths or even forming continuous low-shield channels, this invention provides a radiation shielding design method for concrete X-ray inspection. This method enables seams and openings to precisely avoid or shield high-risk channels, effectively blocking continuous low-shield leakage paths and significantly improving shielding reliability. The specific technical solution is as follows: This application provides a method for designing a radiation shield for X-ray inspection of concrete, comprising the following steps: Obtain relevant parameters of the concrete structure to be inspected and the X-ray inspection task, and establish a basic model including several exposure conditions and candidate shielding structures. Compare the main ray direction, the irradiated area of ​​concrete, the irradiated area of ​​shielding, the associated dose evaluation point, and the functional opening status of any two exposure conditions, and calculate the comprehensive correlation degree. Based on the comprehensive correlation, the exposure conditions are divided into several exposure task groups, and a corresponding shielding working state is established for each exposure task group. Based on the working status of each exposure task group and the corresponding shield, a ray path diagram is established; the ray path diagram uses X-ray source, concrete scattering unit, shielding area, joint, functional opening and dose evaluation point as nodes, and connects them through ray propagation relationship; Based on the ray path diagram, the comprehensive transmittance and the dose rate after shielding for each independent propagation path are calculated. Combined with the preset uncertainty conditions, the cumulative leakage risk of each position of the shielding cover under all exposure conditions is obtained. Based on the cumulative leakage risk, the topological constraints of the seams and the arrangement restrictions of the functional openings are generated. Based on the cumulative leakage risk and layout limitations, the shielding module boundary is determined and quality constraints are met. The joint installation status parameters and their actual transmission capacity are determined. A folded or staggered shielding path is adopted for the functional openings, and a detachable shielding cover is set to obtain the radiation shielding cover product structure.

[0005] Preferably, the establishment of the basic model, which includes several exposure conditions and candidate shielding structures, specifically includes: Each scheduled exposure is defined as an exposure condition: in, Location of the X-ray source; Location of the detector; The tube voltage; For tube current; The duration of a single exposure; This refers to the number of repeated exposures. The direction of the main beam axis; For collimator opening parameters; The area of ​​concrete exposed to sunlight; A candidate shield structure model is established in a unified three-dimensional coordinate system. The candidate shield structure model includes a source-side shielding region, a receiver-side shielding region, a local reinforcement candidate region, a module candidate boundary, a functional opening candidate region, and a dose evaluation point.

[0006] Preferably, the formula for calculating the comprehensive correlation degree is: in, The overall correlation between the two exposure conditions; Correlation degree of the main ray direction; Correlation degree of the irradiated area of ​​concrete; The correlation degree of the associated region of the shield envelope surface; For dose evaluation point correlation; Associativity of functional opening state; , , , and These are the corresponding weights, and the sum of the weights is 1.

[0007] Preferably, dividing the exposure conditions into several exposure task groups based on the comprehensive correlation specifically includes: When the overall correlation between two exposure conditions reaches the set requirements and there is no functional opening state conflict, the two will be assigned to the same exposure task group.

[0008] Preferably, the shielding cover's working states include a shielding area, a locally reinforced area, a functional opening closed state, and a seam covered state.

[0009] Preferably, the step of establishing a ray path diagram based on each exposure task group and the corresponding shielding cover working status specifically includes: Acquire the concrete structure model, X-ray source parameters, shield candidate area and shield working status corresponding to each exposure task group, and determine the spatial position of each node in a unified three-dimensional coordinate system. For each exposure condition in each of the aforementioned exposure task groups, a main ray propagation path, a concrete scattering ray propagation path, and a leakage ray propagation path are established respectively. Using X-ray sources, concrete scattering units, shielded areas, shielded joints, functional openings, and dose evaluation points as nodes, and each ray propagation path as a directed path edge, a ray path diagram is constructed.

[0010] Preferably, the calculation of the cumulative leakage risk at each location of the shielding cover specifically includes: For each ray path, when the ray path continuously passes through shielding material, seams, and functional openings, the overall transmittance of the ray path is calculated according to the series transmission relationship. The overall transmittance is expressed as: In the formula, For the first The first exposure condition Independent propagation path to the first Overall transmittance at each dose evaluation point; It is an independent propagation path; For path edges; For path edges Transmittance; Based on the overall transmittance and the contribution of unshielded dose rate to each ray path, the post-shielding dose rate at the corresponding dose evaluation point for each ray path is calculated: In the formula, This represents the dose rate after shielding. The number of independent propagation paths; For the first The unshielded dose rate contribution of each independent propagation path; Based on the dose rate after shielding, the exposure time for each exposure condition, the number of repeated exposures, and the preset uncertainties, the cumulative leakage risk is calculated: In the formula, For risk assessment objects The cumulative leakage risk value; For a set of uncertain operating conditions; This is an uncertain operating condition; The cumulative dose for the risk assessment object under uncertain operating conditions; This corresponds to the number of repeated exposures; This corresponds to the single exposure time.

[0011] Preferably, generating joint topology constraints and functional opening arrangement limitations based on the cumulative leakage risk includes: Based on the cumulative leakage risk, the candidate shielding structures are divided into ordinary shielding areas, reinforced shielding areas, seam-free areas, key seam areas, and functional opening restriction areas. The seam prohibition area is the area where module boundaries and ordinary seams are prohibited; the key seam area is the seam area where overlapping, staggered seams or additional coverings are used; the functional opening restriction area is the area where straight-through functional openings are not provided or where a foldback shielding structure is used.

[0012] Preferably, determining the boundary of the shielding module and satisfying the quality constraints specifically includes: Select one candidate shielding configuration for each shielded area: In the formula, For shielding partition units The corresponding number of candidate blocking configurations; The mass of a single shielding module is determined as follows: In the formula, For the first The quality of each shielding module; For the first The mass of the load-bearing structure of each shielding module; For the first Each shielding module contains a set of shielding partition units; For shielding partition units The area; Configure candidate masking The number of material layers; For the first Density of the layer material; For the first The thickness of the layer material; Number the material layers; The maximum mass allowed for a single shielding module.

[0013] Preferably, determining the joint installation state parameters and its actual transmission capability specifically includes: The installation status parameters for each joint are represented as follows: In the formula, For the first Installation state vector of the strip joint; This refers to the actual gap between the boards; This represents the actual misalignment of adjacent shielding plates; This refers to the actual overlap length; This indicates the direction of the seam extension; The orientation of the seam cover; Number the seams; The actual transmittance of the seam is determined as follows: In the formula, For path edges After the first Equivalent transmittance at seam seams; For the seam transmission function; For path edges The corresponding tube voltage; For path edges The angle of incidence; The material structure of the joint area.

[0014] Preferably, the radiation shielding design method for X-ray inspection of concrete of the present invention further includes: The post-shielding dose at each dose evaluation point is recalculated and verified based on the shielding product structure. If the preset allowable dose requirement is not met, the design parameters of the shielding product structure are adjusted. After the shielding cover is actually installed, measure the actual installation state parameters and the on-site dose, and calculate the dose residual between the on-site measured dose and the dose calculated according to the actual installation state. The source of error is determined based on the location and spatial distribution of the dose residual, the correction amount is updated to the corresponding design parameters, and the design verification is re-executed until the shielding design requirements are met.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The radiation shielding design method for X-ray inspection of concrete of this invention acquires all exposure conditions and constructs a ray path map, so that the spatial propagation trajectory of each main ray, scattered ray, and leakage ray corresponds precisely to each part of the shielding, clarifying which areas receive high radiation intensity and which paths have a high penetration risk. Based on the cumulative leakage risk distribution, topological constraints on joints and functional opening layout restrictions are generated: high-risk areas are designated as joint-free zones, forcing module boundaries to detour; openings that must be set up adopt a folded shielding channel to avoid direct passage; the extension direction of the joints avoids the incident direction of the main ray, the joints of the inner and outer layers of the multi-layer shielding are staggered, and a safe distance is maintained between the joints and openings to prevent the formation of continuous low-shield leakage paths. Thus, the layout of joints and openings is no longer independent of the ray path, but actively avoids and directionally strengthens according to the actual radiation field distribution, fundamentally solving the problem of joints and openings being located on high-risk paths or connected in series to form low-shield channels, and effectively controlling the weak points of the shielding. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a flowchart illustrating a radiation shield design method for X-ray inspection of concrete, as shown in an exemplary embodiment of this application.

[0018] Figure 2 This is an exemplary embodiment of the present application illustrating the overall structure of a radiation shield and a concrete X-ray inspection system.

[0019] Figure 3 This is a schematic diagram of the source-side shielding component structure shown in an exemplary embodiment of this application.

[0020] Figure 4 This is a schematic diagram illustrating the positional relationship between the receiving-side shielding assembly and the DR imaging plate, as shown in an exemplary embodiment of this application.

[0021] Figure 5 This is a schematic diagram of a partial structure of the seam of the shielding module, illustrating an exemplary embodiment of this application.

[0022] Figure 6 This is a schematic diagram of a functional opening shielding structure shown in an exemplary embodiment of this application.

[0023] Figure 7 This is a schematic diagram illustrating the working state of the shield at different detection angles, as shown in an exemplary embodiment of this application.

[0024] The attached diagram is labeled as follows: 1-Multi-angle inspection fixture; 2-Source-side shielding assembly; 3-X-ray machine; 4-X-ray beam exit; 5-DR imaging plate; 6-Receiver-side shielding assembly; 7-Locally reinforced shielding assembly; 8-Shielding joint; 9-Joint cover; 10-Concrete pole; 12-Installation connector; 13-Functional opening; 14-Functional opening shielding assembly. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be understood that, when used in this specification, the terms “comprising” and “including” indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should also be further understood that the term "and / or" as used in this specification refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes such combinations.

[0029] In the specific embodiments of this application, the X-ray inspection scenario of concrete poles is used as an example for detailed description. However, those skilled in the art should understand that this design method is also applicable to the X-ray inspection of other concrete components such as bridges, building walls, and pipelines. This application aims to deeply couple the calculation of radiation field distribution under multi-exposure conditions with the modular division, joint layout, and opening design of the shielding cover, so that the final manufactured shielding cover product can accurately match the risk distribution of the actual inspection task.

[0030] Please see Figure 1 , Figure 1This is a flowchart illustrating a radiation shield design method for X-ray inspection of concrete, as shown in one embodiment of this application. The specific implementation of each step is described in detail below.

[0031] Step S101: Obtain relevant parameters of the concrete structure to be inspected and the X-ray inspection task, and establish a basic model including several exposure conditions and candidate shielding structures. In this embodiment, the relevant parameters of the concrete structure to be inspected and the X-ray inspection task are first obtained. Specifically, the parameters to be obtained include: the spatial dimensions and inspection area of ​​the concrete structure to be inspected, concrete thickness, density, distribution of reinforcing bars, prestressing tendons and metal embedded parts, X-ray source location, detector location, tube voltage, tube current, single exposure time and number of repeated exposures, main beam direction, collimator opening parameters, and allowable installation space for the shield.

[0032] In one embodiment of this application, the concrete structure to be tested is defined as a three-dimensional spatial region.

[0033] in, This indicates the spatial area of ​​the concrete structure to be inspected.

[0034] in, Location of the X-ray source; Location of the detector; The tube voltage; For tube current; The duration of a single exposure; This refers to the number of repeated exposures. The direction of the main beam axis; For collimator opening parameters; The area of ​​concrete exposed to sunlight; In one embodiment of this application, it is also necessary to establish a candidate structure model of the shield in a unified three-dimensional coordinate system. Specifically, the candidate structure model of the shield includes: The source-side shielding area is set around the X-ray machine and retains the beam exit area in the direction towards the concrete structure; The receiving-side shielding area is located on the side of the DR imaging plate away from the concrete structure. Its shielding range covers the DR imaging area and extends to the periphery of the imaging area according to the range of ray propagation. Local reinforcement candidate areas are set at high leakage risk locations determined in subsequent calculations, for the installation of additional shielding plates or additional shielding layers; The candidate boundary of the module is determined in advance based on the processing size of the shielding material, the installation position of the testing fixture, and the range of motion of the equipment; Candidate areas for functional openings are determined based on requirements for X-ray beam exit, cable passage, equipment installation, and avoidance of moving parts; and dose evaluation points are located on the outside of the shield, in areas accessible to personnel, and in areas adjacent to seams and functional openings. The risk results obtained from subsequent calculations can be directly mapped to the specific product structure of the shield.

[0035] Step S102: Compare the main ray direction, concrete irradiated area, shield irradiated area, associated dose evaluation point, and functional opening status of any two exposure conditions, and calculate the comprehensive correlation degree.

[0036] Since a single concrete X-ray inspection may involve multiple X-ray source locations, multiple irradiation directions, and multiple exposures, all exposure conditions are not treated as the same shielding state. Instead, tasks are grouped according to the correlation between the exposure conditions.

[0037] In one embodiment of this application, for any two exposure conditions, the correlation between the following five dimensions is compared: The main beam direction correlation is used to characterize whether the main beam axis directions of two exposure conditions are similar. The correlation of the irradiated area of ​​concrete is used to characterize whether the irradiated areas of two exposure conditions on a concrete component overlap. The correlation degree of the shield envelope surface is used to characterize whether the irradiated areas of the shield envelope surface overlap under two exposure conditions. The correlation of dose evaluation points is used to characterize whether the dose evaluation points of interest in two exposure conditions are the same or adjacent. Functional opening state correlation is used to characterize whether the opening or closing state of each functional opening is consistent under two exposure conditions.

[0038] The overall correlation is calculated using the following formula: in, The overall correlation between the two exposure conditions; Correlation degree of the main ray direction; Correlation degree of the irradiated area of ​​concrete; The correlation degree of the associated region of the shield envelope surface; For dose evaluation point correlation; Associativity of functional opening state; , , , and These are the corresponding weights, and the sum of the weights is 1.

[0039] The specific values ​​of each weight can be adjusted according to the actual detection scenario and safety requirements. For example, in scenarios with high requirements for radiation leakage control, the weights can be appropriately increased. The value of is determined to strengthen the consideration of risk at dose evaluation points.

[0040] Step S103: Divide the exposure conditions into several exposure task groups according to the comprehensive correlation, and establish a corresponding shielding working state for each exposure task group.

[0041] When the overall correlation between two exposure conditions reaches a preset correlation threshold, and there is no functional opening state conflict, they are assigned to the same exposure task group. The set of exposure task groups is represented as follows: in, To disclose the number of task groups.

[0042] Establish corresponding shielding states for each task group, including shielded areas, locally reinforced areas, functional opening closure states, and seam coverage states: in, Indicates the configuration of the shielded area. This indicates a localized strengthening of the regional configuration. This indicates the configuration of the function opening being closed. This indicates the configuration of the seam coverage status.

[0043] For example, when the inspection fixture moves the X-ray machine and DR imaging plate to change the inspection angle, the source-side shielding assembly and the receiver-side shielding assembly adjust their positions accordingly. Functional openings that are not needed at a certain inspection angle can be closed with corresponding shielding components; for areas with high risk at that angle, corresponding localized reinforced shielding components can be activated.

[0044] By grouping multiple exposure conditions with similar radiation propagation areas and compatible shielding requirements into the same task group for unified processing, the problems of overly conservative or underestimated risks caused by simply superimposing all conditions or designing only based on the maximum condition are avoided. The output shows the exposure task group and shielding cover operating status corresponding to different detection conditions.

[0045] Step S104: Based on the working status of each exposure task group and the corresponding shield, establish a ray path diagram; the ray path diagram uses X-ray source, concrete scattering unit, shielding area, joint, functional opening and dose evaluation point as nodes, and connects them through ray propagation relationship.

[0046] In this embodiment, the radiation paths mainly include three types: the main radiation path directly generated by the X-ray source, the scattered radiation path generated after the main radiation irradiates the concrete, and the leakage radiation path generated by components such as the X-ray source or collimator.

[0047] In one embodiment of this application, the main ray dose calculation is performed as follows. The main ray dose rate at spatial location x for the k-th exposure condition is determined according to the following relationship: in, For the first The spatial location of each exposure condition The main ray dose rate at the location; tube voltage tube current and source output correction parameters The corresponding reference dose rate source term; X-ray source to spatial position The geometric propagation function; The attenuation factor of concrete and metal materials along the propagation path; This is the collimator opening constraint function.

[0048] In one embodiment of this application, the concrete scattering dose calculation is performed as follows: The irradiated area of ​​the concrete is divided into multiple scattering units: In the formula, A collection of scattering units; For the first One scattering unit; This represents the number of scattering units.

[0049] The scattering contribution of each scattering unit to the dose evaluation point is determined according to the following relationship: in, Contributes to the scattering dose rate; The main ray reaches the first The center position of each scattering unit The dose rate; This is the concrete scattering response function; The tube voltage; The equivalent thickness of the concrete from the X-ray source to the scattering unit; The material density of the scattering unit; The scattering angle formed from the source to the scattering unit and then to the dose evaluation point; The distance from the scattering unit to the dose evaluation point; The parameters for correcting the metallic material of the scattering unit.

[0050] The dose contributions of each scattering unit at the same evaluation point are summed: In the formula, For the first The first exposure condition in the Scattered dose rate at each dose evaluation point.

[0051] In one embodiment of this application, the specific method for establishing the ray path diagram is as follows: The X-ray source, concrete scattering unit, shielding area, joints, functional openings, and dose evaluation points are used as nodes and connected through ray propagation relationships: In the formula, For the first Ray path diagram of each exposure task group; A set of nodes; It is a set of directed path edges; This is a set of path edge attributes.

[0052] The radiation path corresponds to the specific shielding structure. For example, the radiation path might sequentially pass through: X-ray source → source-side shielding assembly → concrete component → DR imaging panel → receiver-side shielding assembly; or it might pass through: X-ray source → seam or functional opening of the source-side shielding assembly → external dose evaluation point of the shielding assembly; or: concrete scattering area → locally reinforced shielding assembly → external dose evaluation point of the shielding assembly. Therefore, by observing the radiation path, it is possible to determine which specific shielding assembly, seam, or functional opening is most significantly affected by radiation.

[0053] For example, using X-ray sources, concrete scattering units, shielded areas, shielding joints, functional openings, and dose evaluation points as nodes, and each ray propagation path as a directed path edge, a ray path diagram is constructed. Solid lines represent the main ray propagation path, dashed lines represent scattered ray propagation paths, and dotted lines represent leaked ray propagation paths.

[0054] Step S105: Based on the ray path diagram, calculate the comprehensive transmittance and the dose rate after shielding for each independent propagation path, and combine the preset uncertainty conditions to obtain the cumulative leakage risk of each position of the shielding cover under all exposure conditions, and generate the joint topology constraints and functional opening arrangement restrictions based on the cumulative leakage risk.

[0055] In one embodiment of this application, for each ray path, when a ray path continuously passes through shielding material, seams, and functional openings, the overall transmittance of the ray path is calculated according to the series transmission relationship. The overall transmittance is expressed as: In the formula, For the first The first exposure condition Independent propagation path to the first Overall transmittance at each dose evaluation point; It is an independent propagation path; For path edges; For path edges Transmittance; Based on the overall transmittance and the contribution of unshielded dose rate to each ray path, the post-shielding dose rate at the corresponding dose evaluation point for each ray path is calculated: In the formula, This represents the dose rate after shielding. The number of independent propagation paths; For the first The unshielded dose rate contribution of each independent propagation path; Based on the dose rate after shielding, the exposure time for each exposure condition, the number of repeated exposures, and the preset uncertainties, the cumulative leakage risk is calculated: In the formula, For risk assessment objects The cumulative leakage risk value; For a set of uncertain operating conditions; This is an uncertain operating condition; The cumulative dose for the risk assessment object under uncertain operating conditions; This corresponds to the number of repeated exposures; This corresponds to the single exposure time.

[0056] By considering potential deviations in parameters such as X-ray source location, irradiation direction, source output, concrete thickness, and density, calculations were performed for different uncertainties, and the larger risk value was taken as the design basis.

[0057] In one embodiment of this application, the candidate shielding structure is partitioned according to the cumulative leakage risk, specifically including: For ordinary shielding areas, basic shielding materials and thicknesses are used; Strengthen the shielded area by adding localized reinforced shielding plates or additional shielding layers; In principle, no module boundaries or ordinary seams should be set in the seam-prohibited areas. In key seam areas, overlapping, staggered joints, or additional coverings must be used; In areas with restricted functional openings, no straight-through functional openings should be provided, or a folded-back shielding structure should be used.

[0058] Among them, the path repetition associated seams are judged according to the following indicators: In the formula, For the first Path repetition correlation index for candidate seam locations; For the set of associated path edges; For path edges The exposure condition number belongs to; This corresponds to the number of repeated exposures; This corresponds to the single exposure time; The dose rate contribution of the unconfigured joint structure before the path edge reaches the joint candidate position.

[0059] When the indicator reaches the preset threshold, the corresponding seam position will be repeatedly associated with the path for key control.

[0060] Furthermore, in one embodiment of this application, the seam topology constraints also include the following: ordinary seams are avoided at locations of high-risk ray paths; the seam extension direction is avoided from forming a path that facilitates direct ray leakage with the main ray propagation direction; the inner and outer layer seams of the multi-layer shielding structure are staggered; and the seams must not form a continuous low-shield propagation channel with the functional opening.

[0061] In some embodiments, the candidate shielding structure can be divided into different regions based on the cumulative leakage risk, where dark regions represent high-risk regions that require reinforced shielding or are designated as seam-free zones; and light-colored regions represent low-risk regions where ordinary shielding structures can be used.

[0062] Step S106: Based on the cumulative leakage risk and layout limitations, determine the shielding module boundary and meet the quality constraints, determine the joint installation status parameters and their actual transmission capacity, adopt a folded or staggered shielding path for the functional openings and set a detachable shielding cover to obtain the radiation shielding cover product structure.

[0063] Based on the aforementioned cumulative leakage risks, joint constraints, and installation conditions of the testing fixtures, a processable and installable shielding cover product is ultimately formed.

[0064] In one embodiment of this application, a source-side shielding assembly is disposed around the non-beam-exit area of ​​the X-ray machine, forming a beam exit port at a position facing the concrete component to be inspected, allowing the main X-ray for inspection to be directed normally towards the concrete component. The source-side shielding assembly can be made of lead plate, lead rubber, lead sandwich panel, or other materials that meet X-ray shielding requirements. For high-risk areas identified in step S104, locally reinforced shielding assemblies can be added. Therefore, the source-side structure forms a combination of a basic shielding layer, a beam exit port, and an optional locally reinforced shielding layer.

[0065] The DR imaging panel is positioned on the side of the concrete component to be inspected that faces away from the X-ray source. The receiving-side shielding assembly is also positioned on the side of the DR imaging panel that faces away from the concrete component. The X-ray propagation sequence is: X-ray source → concrete component → DR imaging panel → receiving-side shielding assembly. The effective shielding range of the receiving-side shielding assembly covers the DR imaging area and extends outwards from the DR imaging panel according to the X-ray propagation range. The receiving side can use a lead-boron composite shielding plate or other materials that meet the shielding requirements.

[0066] For the high-risk areas identified in step S105, detachable localized reinforced shielding components are added to the basic shielding components. These localized reinforced shielding components can be additional shielding plates, additional shielding layers, or flexible shielding covers. Their locations are not fixed but determined based on the cumulative leakage risk under different testing tasks. This avoids increasing the overall thickness and weight of the shielding for a few high-risk locations.

[0067] Under the premise of meeting the joint arrangement restrictions, the boundary of the shielding module is determined according to the processing size of the shielding plate, the allowable weight of a single module, transportation conditions and on-site installation space.

[0068] In one embodiment of this application, each shielding region can only select one candidate shielding configuration: In the formula, For shielding partition units The corresponding number of candidate blocking configurations; The mass of a single shielding module is determined as follows: In the formula, For the first The quality of each shielding module; For the first The mass of the load-bearing structure of each shielding module; For the first Each shielding module contains a set of shielding partition units; For shielding partition units The area; Configure candidate masking The number of material layers; For the first Density of the layer material; For the first The thickness of the layer material; Number the material layers; The maximum mass allowed for a single shielding module.

[0069] In this embodiment, determining the joint installation state parameters and its actual transmission capability specifically includes: The installation status parameters for each joint are represented as follows: In the formula, For the first Installation state vector of the strip joint; This refers to the actual gap between the boards; This represents the actual misalignment of adjacent shielding plates; This refers to the actual overlap length; This indicates the direction of the seam extension; The orientation of the seam cover; Number the seams; The above parameters should be within the allowable installation range: In the formula, This is the maximum permissible gap between boards; and The lower and upper limits for allowable misalignment; and The lower and upper limits are allowed for the overlap length.

[0070] The actual transmission capability of the joint is determined based on the installation conditions, radiation incident angle, tube voltage, and joint material structure described above. In the formula, For path edges After the first Equivalent transmittance at seam seams; For the seam transmission function; For path edges The corresponding tube voltage; This refers to the actual gap between the boards; This represents the actual misalignment amount; This refers to the actual overlap length; This indicates the direction of the seam extension; The orientation of the seam cover; For path edges The angle of incidence; The material structure of the joint area.

[0071] Functional openings are designed according to the actual needs of the X-ray machine beam output, equipment cables, mounting connections, and motion mechanisms. For cable channels that need to remain open for extended periods or areas that need to be avoided by motion mechanisms, a zigzag or staggered shielding path is used to ensure that there is no continuous straight low-shield path from the inside to the outside of the shielding cover. For openings used only during installation, maintenance, or specific testing conditions, removable shielding covers or partial shielding covers are provided. When a particular exposure task group does not need to use a corresponding functional opening, the opening is switched to a closed state.

[0072] This step ultimately outputs complete radiation shielding product parameters, including: the overall shape of the shielding cover, the structure of the source-side shielding component, the structure of the receiver-side shielding component, the location of local reinforcement shielding, the shielding material and thickness, the module size and boundaries, the location and structure of the seams, the location and shielding structure of the functional openings, the installation and connection locations, and the shielding status corresponding to different exposure task groups.

[0073] The shielding design obtained through the above steps achieves the following: By establishing X-ray path diagrams and cumulative leakage risks based on multiple exposure conditions, the shielding design can simultaneously consider the comprehensive influence of multiple factors such as X-ray source location, irradiation direction, number of exposures, and exposure time. This avoids radiation risk assessment deviations caused by single-condition or maximum-condition design, improving the accuracy of the shielding design. By incorporating seam restrictions, path repetition associations, seam directions, inner and outer layer seam projections, and the connection relationship between seams and functional openings into the shielding structure design, the arrangement of seams and functional openings is optimized in relation to the X-ray path. This avoids the problem of seams and functional openings being located on high-risk X-ray paths, effectively reducing the risk of local radiation leakage from the shielding. By using the actual gaps between plates, misalignment, overlap length, seam direction, and cover posture as actual installation conditions for dose verification, the impact of installation errors on the shielding effect can be quantified during the design phase.

[0074] In the technical solution provided in this application embodiment, by acquiring all exposure conditions and constructing a ray path diagram, the spatial propagation trajectory of each main ray, scattered ray, and leakage ray is precisely correlated with each part of the shielding cover. This allows for the identification of areas with high irradiation intensity and paths with high penetration risk during the design process. Based on this, joint topological constraints and functional opening layout restrictions are generated according to the cumulative leakage risk distribution: high-risk areas are designated as joint-free zones, forcing module boundaries to detour; necessary openings utilize folded-back shielding channels to avoid direct passage; the joint extension direction avoids the main ray incident direction; the inner and outer layers of the multi-layer shielding have staggered joint arrangements, and a safe distance is maintained between joints and openings to prevent the formation of continuous low-shield leakage paths. Thus, the layout of joints and openings is no longer independent of the ray path but is actively avoided and directionally reinforced based on the actual radiation field distribution. This fundamentally solves the problem of joints and openings being located on high-risk paths or connected in series to form low-shield channels, effectively controlling the weak points of the shielding cover.

[0075] Specifically, in a preferred embodiment of this application, the shielding cover is further dose-checked, and the design parameters are corrected using on-site measurement results, specifically including: The post-shielding dose at each dose evaluation point is recalculated and verified based on the shielding product structure. If the preset allowable dose requirement is not met, the design parameters of the shielding product structure are adjusted. After the shielding cover is actually installed, measure the actual installation state parameters and the on-site dose, and calculate the dose residual between the on-site measured dose and the dose calculated according to the actual installation state. The source of error is determined based on the location and spatial distribution of the dose residual, the correction amount is updated to the corresponding design parameters, and the design verification is re-executed until the shielding design requirements are met.

[0076] In practice, after the shielding design is completed, the post-shielding dose at each dose evaluation point is recalculated based on the final determined shielding material, seam structure, functional openings, and mission group shielding status. If a certain evaluation point fails to meet the allowable dose requirements, the corresponding shielding area, seam, or functional opening structure is readjusted.

[0077] After the shielding cover is actually installed, measure the actual gap between the joints, the misalignment between the panels, the actual overlap length, the direction of the joints, the installation status of the cover, the actual status of the functional openings, and the on-site dose at each dose evaluation location.

[0078] The difference between the actual measured dose and the dose calculated based on the actual installation condition is: In the formula, For dose residuals; The dosage was measured on-site; The dose is calculated based on the actual installation status and the coordinates of the actual measurement points.

[0079] Further calculations were performed on the cumulative residuals of the same measurement point under multiple exposure conditions: And the absolute cumulative residual: In the formula, For signed cumulative residuals; For absolute cumulative residuals; To disclose the total number of operating conditions.

[0080] When the residuals meet the set judgment conditions, the source of error is determined based on the location and spatial distribution of the residuals: Concentrated near the functional opening: judged as functional opening error; Continuous distribution along the seam direction or concentrated at the seam intersection: judged as seam error; Located in the region related to the main ray direction: determined to be an X-ray source correlation error; Related to multiple concrete scattering areas: judged to be scattering response error.

[0081] Based on the assessment results, the correction values ​​are updated to the functional opening parameters, joint installation parameters, X-ray source parameters, or concrete scattering response parameters, respectively. After parameter correction, the ray path calculation, cumulative risk calculation, and dose verification are re-executed until the shielding design requirements are met.

[0082] By analyzing the residual between the measured dose and the theoretical calculation, and accurately identifying the source of error based on the spatial distribution of the residual, it is possible to distinguish whether the error is due to X-ray source deviation, joint installation deviation, insufficient opening shielding, or scattering response error, thus enabling targeted parameter rewriting and design correction.

[0083] The following combination Figures 2 to 7 The specific structure of the radiation shield in the embodiments of this application will be described in detail.

[0084] Please see Figure 2 , Figure 2 This is a schematic diagram illustrating the overall structure of a radiation shield and a concrete X-ray inspection system, as shown in an exemplary embodiment of this application. This embodiment uses the X-ray inspection of a concrete pole as an example. The concrete pole 10 to be inspected is vertically arranged, with the X-ray machine 3 and the DR imaging plate 5 located on opposite sides of the pole 10. During inspection, the X-rays generated by the X-ray machine 3 pass through the concrete pole 10 and are received by the DR imaging plate 5, thereby obtaining X-ray images of the internal structure of the concrete pole 10, including reinforcing bars, holes, cracks, etc.

[0085] The X-ray machine 3 and the DR imaging plate 5 are mounted on the multi-angle detection fixture 1, which allows for adjustment of the detection height and angle. To reduce radiation leakage during the detection process, a radiation shield is installed on the multi-angle detection fixture 1. The radiation shield mainly includes: a source-side shielding component 2, a receiver-side shielding component 6, a locally reinforced shielding component 7, a shielding seam 8, a seam cover 9, a mounting connector 12, a functional opening 13, and a functional opening shield 14.

[0086] Among them, the X-ray machine 3, DR imaging plate 5, and concrete pole 10 are used to illustrate the positional relationship between the shielding cover and the detection equipment and the detection object, and are not part of the shielding cover itself.

[0087] Please see Figure 3 , Figure 3 This is a schematic diagram of a source-side shielding assembly structure, illustrating an exemplary embodiment of this application. The source-side shielding assembly 2 is disposed around the X-ray machine 3, shielding the X-ray machine 3 in directions other than the beam exit direction. A beam exit port 4 is provided on the side of the source-side shielding assembly 2 facing the concrete pole 10, allowing the main X-ray required for detection to pass through the beam exit port 4 and irradiate the concrete pole 10. Therefore, the source-side shielding assembly 2 does not completely enclose the X-ray machine 3, but rather forms a partial shielding structure that shields the non-detection direction while allowing beam exit in the detection direction. The source-side shielding assembly can be made of lead plate, lead rubber, lead sandwich panel, or other materials that meet X-ray shielding requirements.

[0088] Please see Figure 4 , Figure 4 This is a schematic diagram illustrating the positional relationship between the receiving-side shielding assembly and the DR imaging plate, as shown in an exemplary embodiment of this application. The DR imaging plate 5 is disposed on the side of the concrete pole 10 facing away from the X-ray machine 3. The receiving-side shielding assembly 6 is further disposed on the side of the DR imaging plate 5 facing away from the concrete pole 10. Therefore, along the main ray propagation direction, the sequence is: X-ray machine 3 → concrete pole 10 → DR imaging plate 5 → receiving-side shielding assembly 6. After the detection rays pass through the concrete pole 10, they are first imaged by the DR imaging plate 5. The remaining rays that pass through the DR imaging plate 5 and propagate from its periphery are then shielded by the receiving-side shielding assembly 6. The shielding range of the receiving-side shielding assembly 6 covers the DR imaging area and can extend outward from the DR imaging plate 5 according to the ray propagation range.

[0089] In one embodiment of this application, the locally reinforced shielding component 7 is determined based on the aforementioned design method, which calculates the ray path and cumulative leakage risk under different exposure conditions. When there are locally high-risk locations in the source-side shielding component 2, the receiving-side shielding component 6, or other shielding areas, the locally reinforced shielding component 7 is installed at the corresponding location. The locally reinforced shielding component 7 can be an additional shielding plate, an additional shielding layer, or a flexible shielding cover. Its function is to provide targeted reinforcement to high-risk locations without increasing the overall weight and thickness of the shielding cover. The locally reinforced shielding component 7 can have a detachable structure, allowing it to be installed, removed, or repositioned according to different exposure task groups.

[0090] The source-side shielding assembly 2, the receiving-side shielding assembly 6, and the locally reinforced shielding assembly 7 are respectively mounted on the multi-angle inspection fixture 1 via mounting connectors 12. The mounting connectors 12 are used to maintain the relative positions of each shielding assembly with the X-ray machine 3 and the DR imaging plate 5. When the multi-angle inspection fixture 1 is raised or lowered, the X-ray machine 3, the DR imaging plate 5, and the corresponding shielding assemblies can adjust their inspection height together with the inspection fixture. When the inspection fixture changes its inspection angle, the source-side shielding assembly 2 and the receiving-side shielding assembly 6 change their positions relative to the concrete pole 10 along with the X-ray machine 3 and the DR imaging plate 5. This allows the shielding structure to adapt to X-ray inspections at different heights and angles.

[0091] Please see Figure 5 , Figure 5 This is a schematic diagram of a partial structure of a shielding module seam, illustrating an exemplary embodiment of this application. When the source-side shielding assembly 2, the receiving-side shielding assembly 6, or the locally reinforced shielding assembly 7 consists of multiple shielding modules, a shielding seam 8 is formed between adjacent shielding modules. For ordinary shielding seams 8, adjacent shielding modules employ an overlapping or staggered structure, causing the shielding materials of the two shielding modules to overlap at the seam location, thereby avoiding the formation of a directly penetrating radiation leakage path. For critical seams determined by the aforementioned design method, a seam cover 9 is further provided outside the shielding seam 8.

[0092] The joint position and joint parameters calculated using the aforementioned embodiment can be directly converted into the joint structure in the actual shielding cover product.

[0093] Please see Figure 6 , Figure 6This is a schematic diagram of a functional opening shielding structure illustrating an exemplary embodiment of this application. Functional openings 13 can be provided on the radiation shielding cover according to actual installation needs. Functional openings 13 are mainly used for cable passage, installation connector passage, avoidance of moving mechanisms, and equipment installation and maintenance. For functional openings 13 that need to remain open, functional opening shielding components 14 are provided at their corresponding positions, causing the functional openings to form a zigzag or staggered propagation path, reducing the possibility of forming a straight low-shield propagation channel from the inside to the outside of the shielding cover. For functional openings 13 used only during installation, maintenance, or specific testing conditions, removable shielding covers can be provided. Under different exposure task groups, the open or closed state of the functional openings 13 can be changed according to actual usage needs.

[0094] Please see Figure 7 , Figure 7 This is a schematic diagram illustrating the working state of the shielding cover under different detection angles, as shown in an exemplary embodiment of this application. During the detection process, the multi-angle detection fixture 1 can change the position of the X-ray machine 3 and the DR imaging plate 5 relative to the concrete pole 10. The source-side shielding assembly 2 moves with the X-ray machine 3, and the receiving-side shielding assembly 6 moves with the DR imaging plate 5, thereby maintaining the basic spatial relationship between the source-side shielding assembly, the X-ray machine, the concrete pole, the DR imaging plate, and the receiving-side shielding assembly.

[0095] For different inspection angles, the following are determined based on the corresponding exposure task group: the currently activated basic shielding components, the locally reinforced shielding components that need to be added, the key seams for which seam covers need to be installed, and the open or closed status of the current functional openings. Therefore, the shielding cover does not adopt a fixed shielding state to cope with all inspection conditions, but can form a corresponding shielding structure state according to the specific inspection task.

[0096] The following describes the shielding effect verification process of the embodiments of this application.

[0097] After the shielding cover is installed, on-site dose measurements are performed according to the dose evaluation points determined by the design method. The actual on-site dose is then compared with the dose calculated based on the actual installation conditions. When significant residuals exist in localized areas, the corresponding structural components are further examined based on the residual location. For example, if the residuals are concentrated near the shielding joint 8, the gaps between plates, misalignment, overlap length, and joint cover 9 are checked; if the residuals are concentrated near the functional opening 13, the functional opening shield 14 is checked; if the residuals are located in the area related to the main radiation, the position of the X-ray machine 3, beam direction, and beam exit 4 are checked; if the residuals are related to the concrete scattering area, the scattering response parameters are corrected. This achieves a closed-loop process encompassing shielding design, product processing and installation, actual testing, dose verification, and design parameter correction.

[0098] It should be noted that, in the above embodiments, the technical solution of this application was described using X-ray inspection of concrete poles as an example. However, the technical solution of this application is also applicable to X-ray inspection scenarios of other types of concrete components (such as bridges, building structures, pipelines, etc.). In different application scenarios, the relevant calculation parameters and shielding structure design can be adaptively adjusted according to the specific inspection task parameters and structural characteristics.

[0099] Furthermore, in the above embodiments, the shielding materials of the source-side shielding assembly and the receiver-side shielding assembly are described using lead plates, lead rubber, lead sandwich panels, and lead-boron composite shielding panels as examples. However, those skilled in the art should understand that other materials with X-ray shielding capabilities can also be used, such as tungsten alloy plates, depleted uranium plates, barium sulfate composite plates, etc. These alternative solutions can also achieve the shielding purpose of this application.

[0100] In the above embodiments, the installation connector is illustrated using bolt connection as an example, but other connection methods can also be used, such as pin connection, snap-fit ​​connection, quick-clamp connection, etc. These alternative solutions can also achieve the installation connection purpose of this application.

[0101] In one embodiment of this application, a radiation shield is also provided, which is designed according to the design method described in any of the above embodiments. The radiation shield includes a source-side shielding assembly, a receiver-side shielding assembly, a locally reinforced shielding assembly, a shielding seam, a seam cover, a mounting connector, and a functional opening shielding structure.

[0102] In one embodiment of this application, a concrete X-ray inspection system is also provided, including a multi-angle inspection fixture, an X-ray machine, a DR imaging plate, and the aforementioned radiation shield. The X-ray machine and the DR imaging plate are mounted on the multi-angle inspection fixture and arranged opposite to each other. The radiation shield is mounted on the multi-angle inspection fixture to shield radiation during the X-ray inspection process.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the specification of the present invention.

Claims

1. A method of designing a radiation shield for concrete X-ray inspection, characterized in that, Includes the following steps: Obtain relevant parameters of the concrete structure to be inspected and the X-ray inspection task, and establish a basic model including several exposure conditions and candidate shielding structures. Compare the main ray direction, the irradiated area of ​​concrete, the irradiated area of ​​shielding, the associated dose evaluation point, and the functional opening status of any two exposure conditions, and calculate the comprehensive correlation degree. Based on the comprehensive correlation, the exposure conditions are divided into several exposure task groups, and a corresponding shielding working state is established for each exposure task group. Based on the working status of each exposure task group and the corresponding shield, a ray path diagram is established; the ray path diagram uses X-ray source, concrete scattering unit, shielding area, joint, functional opening and dose evaluation point as nodes, and connects them through ray propagation relationship; Based on the ray path diagram, the comprehensive transmittance and the dose rate after shielding for each independent propagation path are calculated. Combined with the preset uncertainty conditions, the cumulative leakage risk of each position of the shielding cover under all exposure conditions is obtained. Based on the cumulative leakage risk, the topological constraints of the seams and the arrangement restrictions of the functional openings are generated. Based on the cumulative leakage risk and layout limitations, the shielding module boundary is determined and quality constraints are met. The joint installation status parameters and their actual transmission capacity are determined. A folded or staggered shielding path is adopted for the functional openings, and a detachable shielding cover is set to obtain the radiation shielding cover product structure.

2. The radiation shielding design method for X-ray inspection of concrete according to claim 1, characterized in that, The establishment of the basic model includes several exposure conditions and candidate shielding structures, specifically including: Each scheduled exposure is defined as an exposure condition: in, Location of the X-ray source; Location of the detector; The tube voltage; For tube current; The duration of a single exposure; This refers to the number of repeated exposures. The direction of the main beam axis; For collimator opening parameters; The area of ​​concrete exposed to sunlight; A candidate shield structure model is established in a unified three-dimensional coordinate system. The candidate shield structure model includes a source-side shielding region, a receiver-side shielding region, a local reinforcement candidate region, a module candidate boundary, a functional opening candidate region, and a dose evaluation point.

3. The radiation shielding design method for X-ray inspection of concrete according to claim 1, characterized in that, The formula for calculating the comprehensive correlation degree is as follows: in, The overall correlation between the two exposure conditions; Correlation degree of the main ray direction; Correlation degree of the irradiated area of ​​concrete; The correlation degree of the associated region of the shield envelope surface; For dose evaluation point correlation; Associativity of functional opening state; , , , and These are the corresponding weights, and the sum of the weights is 1.

4. A radiation shielding design method for X-ray inspection of concrete according to claim 3, characterized in that, The process of dividing the exposure conditions into several exposure task groups based on the comprehensive correlation specifically includes: When the overall correlation between two exposure conditions reaches the set requirements and there is no conflict in the function opening state, the two will be assigned to the same exposure task group.

5. A radiation shield design method for X-ray inspection of concrete according to claim 3, characterized in that, The step of establishing a ray path diagram based on each exposure task group and the corresponding shielding cover working status specifically includes: Acquire the concrete structure model, X-ray source parameters, shield candidate area and shield working status corresponding to each exposure task group, and determine the spatial position of each node in a unified three-dimensional coordinate system. For each exposure condition in each of the aforementioned exposure task groups, a main ray propagation path, a concrete scattering ray propagation path, and a leakage ray propagation path are established respectively. Using X-ray sources, concrete scattering units, shielded areas, shielded joints, functional openings, and dose evaluation points as nodes, and each ray propagation path as a directed path edge, a ray path diagram is constructed.

6. A radiation shielding design method for X-ray inspection of concrete according to claim 1, characterized in that, The calculation of the cumulative leakage risk at each location of the shielding cover specifically includes: For each ray path, when the ray path continuously passes through shielding material, seams, and functional openings, the overall transmittance of the ray path is calculated according to the series transmission relationship. The overall transmittance is expressed as: In the formula, For the first The first exposure condition Independent propagation path to the first Overall transmittance at each dose evaluation point; It is an independent propagation path; For path edges; For path edges Transmittance; Based on the overall transmittance and the contribution of unshielded dose rate to each ray path, the post-shielding dose rate at the corresponding dose evaluation point for each ray path is calculated: In the formula, This represents the dose rate after shielding. The number of independent propagation paths; For the first The unshielded dose rate contribution of each independent propagation path; Based on the dose rate after shielding, the exposure time for each exposure condition, the number of repeated exposures, and the preset uncertainties, the cumulative leakage risk is calculated: In the formula, For risk assessment objects The cumulative leakage risk value; For a set of uncertain operating conditions; This is an uncertain operating condition; The cumulative dose for the risk assessment object under uncertain operating conditions; This corresponds to the number of repeated exposures; This corresponds to the single exposure time.

7. A radiation shielding design method for X-ray inspection of concrete according to claim 1, characterized in that, The topological constraints on joints and the arrangement limitations of functional openings generated based on the cumulative leakage risk include: Based on the cumulative leakage risk, the candidate shielding structures are divided into ordinary shielding areas, reinforced shielding areas, seam-free areas, key seam areas, and functional opening restriction areas. The seam prohibition area is the area where module boundaries and ordinary seams are prohibited; the key seam area is the seam area where overlapping, staggered seams or additional coverings are used; the functional opening restriction area is the area where straight-through functional openings are not provided or where a foldback shielding structure is used.

8. A method for designing a radiation shield for X-ray inspection of concrete according to claim 1, characterized in that, The determination of the shielding module boundary and satisfaction of quality constraints specifically includes: Select one candidate shielding configuration for each shielded area: In the formula, For shielding partition units The corresponding number of candidate blocking configurations; The mass of a single shielding module is determined as follows: In the formula, For the first The quality of each shielding module; For the first The mass of the load-bearing structure of each shielding module; For the first Each shielding module contains a set of shielding partition units; For shielding partition units The area; Configure candidate masking The number of material layers; For the first Density of the layer material; For the first The thickness of the layer material; Number the material layers; The maximum mass allowed for a single shielding module.

9. A method for designing a radiation shield for X-ray inspection of concrete according to claim 1, characterized in that, The determination of the joint installation state parameters and its actual transmission capability specifically includes: The installation status parameters for each joint are represented as follows: In the formula, For the first Installation state vector of the strip joint; This refers to the actual gap between the boards; This represents the actual misalignment of adjacent shielding plates; This refers to the actual overlap length; This indicates the direction of the seam extension; The orientation of the seam cover; Number the seams; The actual transmittance of the seam is determined as follows: In the formula, For path edges After the first Equivalent transmittance at seam seams; For the seam transmission function; For path edges The corresponding tube voltage; For path edges The angle of incidence; The material structure of the joint area.

10. A method for designing a radiation shield for X-ray inspection of concrete according to any one of claims 1-9, characterized in that, Also includes: The post-shielding dose at each dose evaluation point is recalculated and verified based on the shielding product structure. If the preset allowable dose requirement is not met, the design parameters of the shielding product structure are adjusted. After the shielding cover is actually installed, measure the actual installation state parameters and the on-site dose, and calculate the dose residual between the on-site measured dose and the dose calculated according to the actual installation state. The source of error is determined based on the location and spatial distribution of the dose residual, the correction amount is updated to the corresponding design parameters, and the design verification is re-executed until the shielding design requirements are met.

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