Device and method for measuring surface density of neutron absorbing material B10

Abstract

The invention provides a device and a method for measuring the surface density of a neutron absorbing material B10. The device comprises a control system, a driver, a neutron detector and a sample holder. The sample rack is used for slidably arranging a to-be-tested sample and a standard sample; the neutron detector is arranged on the sample rack and is used for measuring and outputting neutron data after a neutron beam passes through the to-be-measured sample or the standard sample; the control system is used for receiving measurement data of the neutron detector, calculating the B10 surface density of the to-be-measured sample and controlling the measurement position of the to-be-measured sample and / or the standard sample on the sample rack; the driver is respectively connected with the control system and the sample rack, and drives the to-be-tested sample and / or the standard sample to horizontally move and / or vertically move on the sample rack based on an instruction of the control system. According to the invention, the measurement position of the neutron absorption material can be accurately controlled, accurate measurement of the B10 surface density is realized by using the standard sample with the same raw material and processing technology as the to-be-measured sample, and the neutron absorption performance of the neutron absorption material is accurately evaluated.

Description

Technical Field

[0001] This invention relates to the field of neutron-absorbing material measurement technology, and in particular to a device and method for measuring the surface density of neutron-absorbing material B10. Background Technology

[0002] Neutron-absorbing materials (also known as neutron poison test pieces) can absorb neutrons, controlling the rate and scale of nuclear reactions, and are crucial components for maintaining subcritical states in spent fuel pools of nuclear power plants. Boron (especially boron-10 isotopes) has an extremely high absorption cross-section for neutrons; therefore, boron-containing materials are commonly used in neutron-absorbing materials, such as boron-containing stainless steel, boron-aluminum alloys, B4C / Al ceramics, and B4C / Al composite materials. However, neutron-absorbing materials are susceptible to neutrons, gamma irradiation, and boric acid environments, leading to expansion, deformation, and corrosion, which seriously threaten the safety of fuel storage. Therefore, during the operation of spent fuel pools, the neutron absorption performance of neutron-absorbing materials needs continuous monitoring and evaluation to ensure fuel storage safety.

[0003] The B10 (boron-10) surface density is a key parameter of the neutron absorption performance of neutron-absorbing materials. It is generally tested using a non-destructive neutron decay method. Stable thermal neutrons are extracted from a test reactor or neutron source to indirectly measure the B10 surface density. The specific process includes: generating a neutron beam using a neutron source and passing it through a set of standard samples and the sample to be tested with known surface densities. After the neutron beam passes through the sample, a detector is used to measure the number of transmitted neutrons and calculate the thermal neutron transmittance. Then, by comparing the transmittance of the sample to be tested with that of the standard samples, the B10 surface density of the sample to be tested is calculated.

[0004] Accurate measurement of the B10 areal density of neutron-absorbing materials is crucial for ensuring the safe operation of nuclear power plants. However, existing technologies suffer from operational errors and material inhomogeneities during measurement, affecting the accuracy of the results. Firstly, differences in raw materials and processing techniques of neutron-absorbing plates can lead to variations in the B10 areal density of samples. Using a function relating neutron transmittance to areal density derived from a standard sample of neutron-absorbing material with a different processing technique to calculate the areal density of the sample under test will yield inaccurate results. Secondly, finished neutron-absorbing material samples undergo processes such as anodizing and shot peening, which can introduce inhomogeneities. If the measurement positions cannot be kept consistent, this will also affect the measurement deviation of the B10 areal density. For example, the B10 areal density of 31% boron-aluminum neutron-absorbing material ranges from 0.03586 to 0.03965 g / cm³. 2 Within the range, the maximum relative deviation reaches 10%, while the limit required by individual power plants is 5%. If the measurement locations are different, it is impossible to determine whether this difference is caused by a decrease in B10 content or by a deviation in the measurement location. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for measuring the surface density of neutron-absorbing material B10, in order to solve the above-mentioned problems. This method can accurately control the measurement position of the neutron-absorbing material and use a standard sample with the same raw materials, processing technology and treatment method as the sample to be tested to achieve accurate measurement of the surface density of B10, thereby accurately evaluating the neutron absorption performance of the neutron-absorbing material.

[0006] This invention proposes a device for measuring the surface density of neutron-absorbing material B10, including a control system, a driver, a neutron detector, and a sample holder;

[0007] The sample holder is used to slide and set the sample to be tested and the standard sample;

[0008] The neutron detector is mounted on the sample holder and is used to measure and output neutron data after the neutron beam passes through the sample to be tested or the standard sample.

[0009] The control system is used to receive measurement data from the neutron detector, calculate the B10 areal density of the sample to be tested, and control the measurement position of the sample to be tested and / or the standard sample on the sample holder.

[0010] The driver is connected to the control system and the sample holder respectively, and drives the test sample and / or standard sample to move horizontally and / or vertically on the sample holder based on the instructions of the control system.

[0011] In one embodiment, the control system includes an input module, a control module, a data monitoring module, a data analysis module, and a storage module;

[0012] The input module is used to input the size information, measurement location information, and identification information of the sample to be tested. The measurement location information includes the location point number and the distance from the measurement location to the edge of the sample.

[0013] The control module is used to generate control commands based on the test position information, and control the driver to move the sample to be tested and / or the standard sample on the sample holder until it reaches the predetermined measurement position.

[0014] The data monitoring module is used to monitor and receive the measurement data of the neutron detector in real time, including neutron count and neutron transmittance.

[0015] The data analysis module is used to calculate the functional relationship between the transmittance of the neutron absorbing material and the B10 surface density of the standard sample based on the measurement data of each standard sample, and to calculate the B10 surface density of the test sample based on the measurement data of the test sample and the functional relationship between the transmittance of the neutron absorbing material and the B10 surface density of the standard sample, and to evaluate the neutron absorption performance of the test sample.

[0016] The storage module is used to store historical measurement data and data on the functional relationship between the transmittance of the neutron-absorbing material in the standard sample and the B10 surface density. The historical measurement data includes historical measurement size information, measurement location information, identification information of the tested sample and the standard sample, as well as the measurement data of the tested sample.

[0017] The identification information includes sample number, raw material composition information, and processing technology information.

[0018] In one embodiment, the control system further includes a computing module and a matching module;

[0019] The calculation module is used to calculate the measurement position of the test sample after the size change based on the size difference, for test samples with the same identification information but different sizes.

[0020] The matching module is used to match standard samples with the same identification information in the storage module according to the identification information of the sample to be tested.

[0021] In one embodiment, the sample holder includes a horizontal base, a first support rod, a second support rod, and a telescopic tube;

[0022] The first support rod and the second support rod are respectively vertically arranged at both ends of the horizontal base;

[0023] The neutron detector is fixed on the first support rod;

[0024] The second support rod is provided with a slide rail and several sliders, and the sliders move along the slide rail;

[0025] One end of the telescopic tube is fixed to the sample to be tested or the standard sample, and the other end is fixedly connected to the slider;

[0026] The driver is connected to the slider, and drives the slider to move the sample to be tested and / or the standard sample horizontally and / or vertically on the second support rod.

[0027] In one embodiment, a spring is provided inside the telescopic tube, with one end of the spring connected to the slider and the other end connected to the sample to be tested or a standard sample.

[0028] In one embodiment, the first support rod and / or the second support rod are slidably disposed on the horizontal base and move left and right along the connection direction between the first support rod and the second support rod.

[0029] In one embodiment, the neutron absorbing material B10 surface density measuring device further includes a beam-blocking bracket, which is connected to the driver, with its lower end disposed on the horizontal base and its upper end disposed with a thick absorber material;

[0030] The driver drives the thick absorber material to move vertically along the baffle support.

[0031] In one embodiment, the driver is a servo motor.

[0032] This invention also proposes a method for measuring the surface density of neutron-absorbing material B10, which is applied to the neutron-absorbing material B10 surface density measuring device described above, and includes the following steps:

[0033] Place the sample to be tested on the sample holder;

[0034] Input the size information, measurement location information, and identification information of the sample to be tested. The identification information includes the sample number, raw material composition information, and processing technology information.

[0035] Automatically match a standard sample with the same identification information as the sample to be tested, wherein the B10 areal density of the standard sample is known;

[0036] Place the standard sample on the sample holder;

[0037] The control system controls the driver to move the sample to be tested and / or the standard sample to the measurement position;

[0038] Place the neutron source and align it with the measurement position of the sample to be tested and / or the standard sample through the collimator;

[0039] Standard samples with different B10 areal densities were measured sequentially to establish a functional relationship between the transmittance of the neutron-absorbing material in the standard samples and the B10 areal density.

[0040] Neutron transmittance measurement was performed on the sample to be tested.

[0041] The B10 surface density of the sample under test was calculated based on the neutron transmittance data of the sample under test and the functional relationship between the transmittance of the neutron absorbing material of the standard sample and the B10 surface density.

[0042] In one embodiment, when measuring the B10 areal density of the sample before and after radiation,

[0043] If the size of the sample to be tested does not change after irradiation, the control system controls the driver to move the sample to the same position as the first measurement to perform B10 areal density measurement.

[0044] If the size of the sample to be tested changes after irradiation, the control system calculates the measurement position of the sample after irradiation based on the size difference after inputting the size information of the sample, and controls the driver to move the sample to the corresponding measurement position after irradiation to perform B10 areal density measurement.

[0045] Compared with the prior art, the beneficial effects of the neutron-absorbing material B10 surface density measurement device and method of the present invention are as follows:

[0046] 1) This invention utilizes advanced automated control technology to set up a control system that can continuously control the working state of the driver, thereby accurately locating the measurement position of the sample to be tested, ensuring the consistency of the position of the sample to be tested in multiple measurements, overcoming the differences in results caused by material inhomogeneity, ensuring the accuracy and repeatability of measurement results, improving the comparability and reliability of measurement results, and providing an effective guarantee for the accurate evaluation of the neutron absorption performance of neutron absorbing materials in spent fuel pools of nuclear power plants.

[0047] 2) This invention can monitor neutron count in real time, automatically measure neutron transmittance and calculate B10 surface density. Once the preset requirements are met, the measurement will stop automatically. It can also automatically analyze and evaluate whether the neutron absorption performance of the sample exceeds the limit requirements. It has a high degree of automation and improves the safety and efficiency of the measurement process.

[0048] 3) This invention can automatically match standard samples with the same material and processing technology, measure standard samples with different areal densities in sequence, and establish a functional relationship between the transmittance of neutron absorbing materials and areal density, which helps to accurately evaluate the neutron absorption performance of neutron absorbing materials.

[0049] 4) In this invention, the operator can easily input data, set up measurements, and analyze results. The operation is simple, which can reduce human error, improve measurement accuracy, shorten measurement time, improve work efficiency, and make the measurement process faster and more efficient.

[0050] 5) This invention has memory and data storage functions, which can store the data and configuration settings of each measurement, facilitating quick adjustments during subsequent measurements and aiding in the management and application of subsequent data. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the structure of a neutron-absorbing material B10 surface density measuring device according to an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of the structure of the first support rod and the beam-blocking bracket in a neutron-absorbing material B10 surface density measuring device according to an embodiment of the present invention;

[0053] Figure 3 This is a schematic diagram of the use of a neutron-absorbing material B10 surface density measuring device according to an embodiment of the present invention;

[0054] Figure 4 This is a schematic flowchart of a method for measuring the surface density of neutron-absorbing material B10 according to an embodiment of the present invention.

[0055] Figure Labels

[0056] 1. Horizontal base, 2. First support rod, 3. Driver, 4. Control system, 5. Telescopic tube, 6. Spring, 7. Sample to be tested, 8. Second support rod, 9. Standard sample, 10. Beam-blocking bracket, 11. Thick absorber material, 12. Neutron detector, 13. Neutron source, 14. Collimator tube. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention more readily understood, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that while many specific details are set forth in the following description to provide a thorough understanding of the invention, the invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the invention; therefore, the invention is not limited to the specific embodiments disclosed below.

[0058] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0059] Secondly, the phrase "an embodiment" or "an embodiment" in this application refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the invention. The phrases "in one embodiment" and "an embodiment" appearing in different places in this specification do not all refer to the same embodiment, nor are they embodiments that are mutually exclusive, either alone or selectively, with other embodiments. The terms "comprising" or "including" indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term "and / or" as used in this application includes any and all combinations of one or more of the related listed items.

[0060] This invention proposes a device for measuring the surface density of the neutron-absorbing material B10, see [link to relevant documentation]. Figure 1 , Figure 2The system includes a control system 4, a driver 3, a neutron detector 12, and a sample holder. The sample holder is used to slide and position the sample to be tested and the standard sample. The neutron detector 12 is fixedly mounted on the sample holder and is used to measure and output neutron data after the neutron beam passes through the sample to be tested or the standard sample. The control system 4 receives the measurement data from the neutron detector 12, calculates the B10 areal density of the sample to be tested, and controls the measurement position of the sample to be tested and / or the standard sample on the sample holder, providing precise positioning and control to ensure that the sample can be accurately moved to the preset measurement position. The driver 3 is connected to both the control system 4 and the sample holder, and drives the horizontal and / or vertical movement of the sample to be tested and / or the standard sample on the sample holder based on the instructions from the control system 4.

[0061] The test sample refers to the neutron absorbing material whose neutron absorption performance is to be tested in advance, while the standard sample refers to the neutron absorbing material with a known B10 surface density corresponding to the test sample.

[0062] The control system 4 of one embodiment of the present invention includes an input module, a control module, a data monitoring module, a data analysis module, and a storage module. The input module is used to input the size information, measurement position information, and identification information of the sample to be tested. The measurement position information includes the position point number and the distance from the measurement position to the edge of the sample. The control module is used to generate control commands based on the test position information, controlling the driver 3 to move the sample to be tested and / or the standard sample on the sample holder until it reaches the predetermined measurement position. The data monitoring module is used to monitor and receive the measurement data from the neutron detector 12 in real time. The measurement data includes neutron count and neutron transmittance. The data analysis module is used to calculate the functional relationship between the transmittance of the neutron-absorbing material of the standard sample and the B10 surface density based on the measurement data of each standard sample, and to calculate the B10 surface density of the sample to be tested based on the measurement data of the sample to be tested and the functional relationship between the transmittance of the neutron-absorbing material of the standard sample and the B10 surface density, thus evaluating the neutron absorption performance of the sample to be tested. The storage module stores historical measurement data and the functional relationship between the transmittance of the neutron-absorbing material and the B10 areal density of the standard sample. Historical measurement data includes historical measurement dimensions, measurement location information, and identification information for both tested and standard samples, as well as measurement data for the tested samples. The identification information includes sample number, raw material composition information, processing technology information, nuclear power plant information, and unit number information.

[0063] The control system 4 of one embodiment of the present invention further includes a calculation module and a matching module. The calculation module is used to calculate the measurement position of the test sample after a size change, based on the size difference (e.g., the size change ratio), for test samples with the same identification information but different sizes, thereby adapting the measuring device to the sample size change. The matching module is used to match standard samples with the same identification information in the storage module according to the identification information of the test sample.

[0064] An embodiment of the present invention provides a sample holder comprising a horizontal base 1, a first support rod 2, a second support rod 8, and a telescopic tube 5. The first support rod 2 and the second support rod 8 are vertically positioned at opposite ends of the horizontal base 1. A neutron detector 12 is fixed to the first support rod 2. A slide rail and a slider are mounted on the second support rod 8, with the slider moving along the slide rail. One end of the telescopic tube 5 is fixed to the sample to be tested or a standard sample, and the other end is fixedly connected to the slider. A driver 3 is connected to the slider, driving the slider to cause the sample to be tested and / or the standard sample to slide horizontally and / or vertically on the second support rod 8.

[0065] In one embodiment of the present invention, a spring 6 is provided inside the telescopic tube 5. One end of the spring 6 is connected to a slider, and the other end is connected to the sample to be tested or a standard sample, which is used to elastically fix the sample in front of the neutron detector 12.

[0066] In one embodiment of the present invention, the first support rod 2 and / or the second support rod 8 are slidably disposed on a horizontal base 1 and move left and right along the connection direction between the first support rod 2 and the second support rod 8, thereby adjusting the test distance according to the sample thickness. In one embodiment of the present invention, the measurable sample thickness is within 8 mm.

[0067] The neutron-absorbing material B10 surface density measuring device according to one embodiment of the present invention further includes a beam-blocking support 10, which is connected to a driver 3. The lower end of the beam-blocking support 10 is set on a horizontal base 1, and the upper end is provided with a thick absorber material 11. The driver 3 drives the thick absorber material 11 to move vertically along the beam-blocking support 10 to realize the measurement of beam and beam blocking (during beam blocking measurement, the thick absorber material 11 is moved in front of the sample to block the neutrons from the neutron source 13; during beam measurement, the thick absorber material 11 is moved downward away from the sample).

[0068] The control system 4 can also be equipped with an emergency button to stop all operations in case of an emergency and a fault diagnosis module for automatically detecting fault points of the measuring device, so as to improve the safety of the measuring device and ensure the safety of the operator and the equipment.

[0069] In one embodiment of the present invention, the driver 3 is a servo motor.

[0070] This invention also proposes a method for measuring the surface density of neutron-absorbing material B10. This method is applied to the neutron-absorbing material B10 surface density measuring device described above. See [link to relevant documentation]. Figure 4 It includes the following steps:

[0071] Place the sample to be tested, 7, on the sample holder;

[0072] Input the size information, measurement location information, and identification information of the sample to be tested. The identification information includes sample number, raw material composition information, processing technology information, nuclear power plant information, unit number information, etc.

[0073] Automatically match standard sample 9 with the same identification information as the sample to be tested. The B10 areal density of the standard sample is known.

[0074] Place standard sample 9 on the sample holder;

[0075] The control system 4 controls the driver 3 to move the sample to be tested 7 and / or the standard sample 9 to the measurement position;

[0076] Place the neutron source 13 and align it with the measurement position of the sample 7 and / or standard sample 9 through the collimating tube 14, such as... Figure 3 As shown;

[0077] Standard samples with different B10 areal densities were measured sequentially to establish a functional relationship between the transmittance of the neutron-absorbing material in the standard samples and the B10 areal density.

[0078] Neutron transmittance was measured on sample 7.

[0079] The B10 surface density of the sample under test was calculated based on the neutron transmittance data of the sample under test and the functional relationship between the transmittance of the neutron absorbing material of the standard sample and the B10 surface density.

[0080] When measuring the B10 areal density of the sample before and after irradiation, if the size of the sample does not change after irradiation, the control system 4 controls the driver 3 to automatically position and move the sample to the same position as the first measurement to measure the B10 areal density. If the size of the sample changes after irradiation, after inputting the size information of the sample, the control system 4 calculates the measurement position of the sample after irradiation based on the size difference, and controls the driver 3 to automatically position and move the sample to the corresponding measurement position after irradiation to measure the B10 areal density.

[0081] By comparing the measurement results with preset standards, the neutron absorption capacity of the sample under test can be evaluated; by comparing the measurement results before and after radiation, the stability of the neutron absorbing material in use can be evaluated.

[0082] Specifically, if this is the first measurement of the B10 areal density of sample 7, the user inputs information such as sample number, size, material composition, nuclear power plant, and unit number, as well as measurement location information, including the location point number and distance from the sample edge. Areal density measurement can begin when the neutron beam from the test reactor or neutron source 13 is online. The device automatically selects a standard sample 9 that matches sample 7 and, in conjunction with the driver 3, moves the sample to the measurement position. It then automatically performs straight beam and background count measurements on various standard samples with different areal densities. The control system 4 automatically establishes a relationship between neutron transmittance and B10 areal density based on the measurement results. Subsequently, the device sequentially measures the straight beam and background counts of the sample according to the input order of its location points and calculates the B10 areal density based on the relationship established with the standard samples.

[0083] If the sample to be tested is an irradiated sample that has already undergone pre-characterization measurements on this device, the sample number can be directly entered. The device will automatically locate the measurement position point for that sample. If there are slight changes in size, the device can automatically correct the measurement position point after inputting the information, ensuring consistency with the initial measurement position point. Repeat the above steps to automatically complete the neutron transmittance measurement of the standard sample, then establish the relationship between neutron transmittance and B10 areal density, and finally complete the measurement and calculate the B10 areal density at each position point of the sample to be tested.

[0084] It should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Such expressions are only for the purpose of making the description of the present invention simpler and more convenient, and do not indicate or imply that the component referred to must have a specific orientation or be constructed and operated in a specific orientation.

[0085] Furthermore, in this application, unless otherwise expressly specified and limited, terms such as "connection" and "setup" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0086] The present invention has the following beneficial effects:

[0087] 1) This invention utilizes advanced automated control technology to set up a control system that can continuously control the working state of the driver, thereby accurately locating the measurement position of the sample to be tested, ensuring the consistency of the position of the sample to be tested in multiple measurements, overcoming the differences in results caused by material inhomogeneity, ensuring the accuracy and repeatability of measurement results, improving the comparability and reliability of measurement results, and providing an effective guarantee for the accurate evaluation of the neutron absorption performance of neutron absorbing materials in spent fuel pools of nuclear power plants.

[0088] 2) This invention can monitor neutron count in real time, automatically measure neutron transmittance and calculate B10 surface density. Once the preset requirements are met, the measurement will stop automatically. It can also automatically analyze and evaluate whether the neutron absorption performance of the sample exceeds the limit requirements. It has a high degree of automation and improves the safety and efficiency of the measurement process.

[0089] 3) This invention can automatically match standard samples with the same material and processing technology, measure standard samples with different areal densities in sequence, and establish a functional relationship between the transmittance of neutron absorbing materials and areal density, which helps to accurately evaluate the neutron absorption performance of neutron absorbing materials.

[0090] 4) In this invention, the operator can easily input data, set up measurements, and analyze results. The operation is simple, which can reduce human error, improve measurement accuracy, shorten measurement time, improve work efficiency, and make the measurement process faster and more efficient.

[0091] 5) This invention has memory and data storage functions, which can store the data and configuration settings of each measurement, facilitating quick adjustments during subsequent measurements and aiding in the management and application of subsequent data.

[0092] Although the methods described above are illustrated and depicted as a series of actions for the sake of simplicity, it should be understood and appreciated that these methods are not limited by the order of the actions, as some actions may occur in a different order and / or concurrently with other actions from the illustrations and descriptions herein or not illustrated and described herein but which may be understood by those skilled in the art, according to one or more embodiments.

[0093] The constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in size, structure, shape, and proportions, as well as parameter values, installation arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Various corresponding modifications and variations can be made by those skilled in the art according to this invention without departing from the spirit and essence of the invention, but such corresponding modifications and variations should fall within the protection scope of this invention.

Claims

1. A device for measuring the surface density of neutron-absorbing material B10, characterized in that, Includes control system, actuator, neutron detector and sample holder; The sample holder is used to slide and set the sample to be tested and the standard sample; The neutron detector is mounted on the sample holder and is used to measure and output neutron data after the neutron beam passes through the sample to be tested or the standard sample. The control system is used to receive measurement data from the neutron detector, calculate the B10 areal density of the sample to be tested, and control the measurement position of the sample to be tested and / or the standard sample on the sample holder. The driver is connected to the control system and the sample holder respectively, and drives the test sample and / or standard sample to move horizontally and / or vertically on the sample holder based on the instructions of the control system.

2. The neutron-absorbing material B10 surface density measuring device according to claim 1, characterized in that, The control system includes an input module, a control module, a data monitoring module, a data analysis module, and a storage module; The input module is used to input the size information, measurement location information, and identification information of the sample to be tested. The measurement location information includes the location point number and the distance from the measurement location to the edge of the sample. The control module is used to generate control commands based on the test position information, and control the driver to move the sample to be tested and / or the standard sample on the sample holder until it reaches the predetermined measurement position. The data monitoring module is used to monitor and receive the measurement data of the neutron detector in real time, including neutron count and neutron transmittance. The data analysis module is used to calculate the functional relationship between the transmittance of the neutron absorbing material and the B10 surface density of the standard sample based on the measurement data of each standard sample, and to calculate the B10 surface density of the test sample based on the measurement data of the test sample and the functional relationship between the transmittance of the neutron absorbing material and the B10 surface density of the standard sample, and to evaluate the neutron absorption performance of the test sample. The storage module is used to store historical measurement data and data on the functional relationship between the transmittance of the neutron-absorbing material in the standard sample and the B10 surface density. The historical measurement data includes historical measurement size information, measurement location information, identification information of the tested sample and the standard sample, as well as the measurement data of the tested sample. The identification information includes sample number, raw material composition information, and processing technology information.

3. The neutron-absorbing material B10 surface density measuring device according to claim 2, characterized in that, The control system also includes a calculation module and a matching module; The calculation module is used to calculate the measurement position of the test sample after the size change based on the size difference, for test samples with the same identification information but different sizes. The matching module is used to match standard samples with the same identification information in the storage module according to the identification information of the sample to be tested.

4. The neutron-absorbing material B10 surface density measuring device according to claim 1, characterized in that, The sample holder includes a horizontal base, a first support rod, a second support rod, and a telescopic tube; The first support rod and the second support rod are respectively vertically arranged at both ends of the horizontal base; The neutron detector is fixed on the first support rod; The second support rod is provided with a slide rail and several sliders, and the sliders move along the slide rail; One end of the telescopic tube is fixed to the sample to be tested or the standard sample, and the other end is fixedly connected to the slider; The driver is connected to the slider, and drives the slider to move the sample to be tested and / or the standard sample horizontally and / or vertically on the second support rod.

5. The neutron-absorbing material B10 surface density measuring device according to claim 4, characterized in that, A spring is installed inside the telescopic tube. One end of the spring is connected to the slider, and the other end is connected to the sample to be tested or a standard sample.

6. The neutron-absorbing material B10 surface density measuring device according to claim 4, characterized in that, The first support rod and / or the second support rod are slidably disposed on the horizontal base and move left and right along the connection direction between the first support rod and the second support rod.

7. The neutron-absorbing material B10 surface density measuring device according to claim 4, characterized in that, It also includes a beam-blocking bracket, which is connected to the driver, with its lower end disposed on the horizontal base and its upper end disposed with a thick absorbent material; The driver drives the thick absorber material to move vertically along the baffle support.

8. The neutron-absorbing material B10 surface density measuring device according to claim 1, characterized in that, The driver is a servo motor.

9. A method for measuring the surface density of neutron-absorbing material B10, characterized in that, The method, applied to the neutron-absorbing material B10 surface density measuring device as described in any one of claims 1-8, includes the following steps: Place the sample to be tested on the sample holder; Input the size information, measurement location information, and identification information of the sample to be tested. The identification information includes the sample number, raw material composition information, and processing technology information. Automatically match a standard sample with the same identification information as the sample to be tested, wherein the B10 areal density of the standard sample is known; Place the standard sample on the sample holder; The control system controls the driver to move the sample to be tested and / or the standard sample to the measurement position; Place the neutron source and align it with the measurement position of the sample to be tested and / or the standard sample through the collimator; Standard samples with different B10 areal densities were measured sequentially to establish a functional relationship between the transmittance of the neutron-absorbing material in the standard samples and the B10 areal density. Neutron transmittance measurement was performed on the sample to be tested. The B10 surface density of the sample under test was calculated based on the neutron transmittance data of the sample under test and the functional relationship between the transmittance of the neutron absorbing material of the standard sample and the B10 surface density.

10. The method for measuring the surface density of neutron-absorbing material B10 according to claim 9, characterized in that, When measuring the B10 areal density of the sample before and after radiation... If the size of the sample to be tested does not change after irradiation, the control system controls the driver to move the sample to the same position as the first measurement to perform B10 areal density measurement. If the size of the sample to be tested changes after irradiation, the control system calculates the measurement position of the sample after irradiation based on the size difference after inputting the size information of the sample, and controls the driver to move the sample to the corresponding measurement position after irradiation to perform B10 areal density measurement.

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