Radioactive material activity acquisition method and product

Abstract

The invention provides a radioactive material activity obtaining method and product, and the method comprises the steps: carrying out the scattering imaging scanning of a radioactive material container through a plurality of muons, and obtaining the muon scanning information of the radioactive material container; determining density distribution data of the radioactive material in the radioactive material container according to the muon scanning information; based on the density distribution data of the radioactive materials in the radioactive material container, efficiency calibration is conducted on the radioactive material container through passive efficiency calibration software, and efficiency calibration data of the radioactive material container are obtained; and determining the activity of the radioactive material in the radioactive material container according to the efficiency scale data of the radioactive material container. According to the radioactive material density distribution data determined based on the muon scattering imaging scanning information of the radioactive material container, efficiency calibration is carried out on the radioactive material container, the efficiency calibration accuracy of the radioactive material container can be improved, and the accuracy of determining the activity of the radioactive material is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radioactive material processing, and in particular to a method and product for obtaining the activity of radioactive materials. Background Art

[0002] A large amount of low-level radioactive materials are generated during the operation of nuclear power plants. Before the final disposal of radioactive materials, the activity of radioactive materials must be reconstructed by detecting the gamma (γ) rays released by the radioactive materials themselves, or detecting the radioactive energy generated by external nuclear reactions to stimulate the radioactive materials. Regardless of the activity reconstruction method used, the efficiency of the radioactive material container storing the radioactive materials must be calibrated first. The accuracy of the efficiency calibration of the radioactive material container will directly affect the accuracy of the activity reconstruction of the radioactive materials.

[0003] At present, most of the efficiency calibration methods are based on passive efficiency calibration, which often assumes that the radioactive material is evenly distributed in the radioactive material container, that is, it does not consider the influence of the density distribution of the radioactive material in the radioactive material container on the efficiency calibration, resulting in low accuracy of the efficiency calibration and failure to guarantee the accuracy of the reconstructed radioactive material activity value. How to improve the accuracy of the efficiency calibration of the radioactive material container and the accuracy of the reconstruction of the radioactive material activity have become urgent problems to be solved. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to provide a method and product for obtaining the activity of radioactive materials, aiming to improve the accuracy of the efficiency scale of the radioactive material container and the accuracy of determining the activity of the radioactive material.

[0005] The present application provides a method for acquiring the activity of radioactive materials, comprising: performing scattering imaging scanning on a radioactive material container using multiple muons to obtain muon scanning information of the radioactive material container; determining density distribution data of the radioactive material in the radioactive material container based on the muon scanning information; the muon scanning information is scanning information obtained by performing scattering imaging scanning on the radioactive material container using multiple muons; based on the density distribution data of the radioactive material in the radioactive material container, performing efficiency calibration on the radioactive material container using passive efficiency calibration software to obtain efficiency calibration data of the radioactive material container; and determining the activity of the radioactive material in the radioactive material container based on the efficiency calibration data of the radioactive material container.

[0006] In one embodiment, the muon scanning information includes a first track of each muon of the plurality of muons injected into the radioactive material container detected by a first detector, and a second track of each muon emitted from the radioactive material container detected by a second detector; the first detector and the second detector are respectively located on opposite sides of the radioactive material container; the intersection of the first track of each muon injected into the radioactive material container and the radioactive material container is the incident point of each muon on the radioactive material container, and the intersection of the second track of each muon emitted from the radioactive material container and the radioactive material container is the exit point of each muon on the radioactive material container; the radioactive material in the radioactive material container is determined according to the muon scanning information of the radioactive material container. The steps of obtaining density distribution data of materials include: determining the midpoint of the common perpendicular line between the first track and the second track of each muon as the scattering point of each muon in the radioactive material container; determining the track of each muon passing through the radioactive material container based on the incident point, the exit point and the scattering point in the radioactive material container of each muon; dividing the radioactive material container into a plurality of space units; determining the target track count values ​​of the plurality of space units according to the distance between the track of each muon passing through the radioactive material container and the plurality of space units; and determining the density distribution data of the radioactive material in the radioactive material container according to the target track count values ​​of the plurality of space units and the volume and mass of the radioactive material container.

[0007] In one embodiment, the step of determining the target track count values ​​of the plurality of spatial units according to the distance between the track of each muon passing through the radioactive material container and the plurality of spatial units comprises: selecting the i-th time period from the time period in which the first detector detects each muon being injected into the radioactive material container based on the i-th time length. 1 Time period and i 2 time period; wherein the i-th 1 The time period is related to the i 2 The time periods are continuous and the durations are all the i-th time length; according to the i-th time length 1 The distance between the track of each muon passing through the radioactive material container and the multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 1 Track count value; according to the i-th 2 The distance between the track of each muon passing through the radioactive material container and the multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 2 track count values; respectively obtain the i-th 1 The track count value and the i-th 2The error of the track count value; if the i-th of the plurality of spatial units 1 The track count value and the i-th 2 If the error of each track count value is within the preset range, the i-th track count value of the plurality of spatial units is 1 The track count value or the i-th 2 track count values ​​as the target track count values ​​of the multiple spatial units; if the i-th track count value of the multiple spatial units 1 The track count value and the i-th 2 If any error in the track count values ​​does not meet the preset range, then i is updated to i+1, and the process returns to execute the method of selecting the i-th time period from the time period in which the first detector detects each muon injected into the radioactive material container based on the i-th time length. 1 Time period and i 2 Steps of time period.

[0008] In one embodiment, the i 1 The distance between the track of each muon passing through the radioactive material container and the multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 1 The step of obtaining a track count value, or the step of obtaining a track count value according to the i 2 The distance between the track of each muon passing through the radioactive material container and the multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 2 The steps of obtaining the i-th track count value include: obtaining the i-th track count value respectively n The track of the 1st muon to the mth muon passing through the radioactive material container within the time period, and the 1st distance to the mth distance from the first spatial unit; wherein m is the distance of the i-th muon detected by the first detector. n The total number of muons injected into the radioactive material container within a time period; determining the 1st track count value to the mth track count value of the first spatial unit according to the relationship between the 1st distance to the mth distance and the distance threshold of the first spatial unit; wherein, if the rth distance of the first spatial unit is less than the distance threshold of the first spatial unit, the rth track count value of the first spatial unit is 1, 1≤r≤m; if the tth distance of the first spatial unit is greater than or equal to the distance threshold of the first spatial unit, the tth track count value of the first spatial unit is 0, 1≤t≤m; summing the 1st track count value to the mth track count value of the first spatial unit to determine the i-th track count value of the first spatial unit n Track count values; where i n =i 1 or 2 , the first spatial unit is any spatial unit among multiple spatial units.

[0009] In one embodiment, the trajectory of each muon passing through the radioactive material container includes an incident trajectory and an exit trajectory of each muon; wherein the incident trajectory of each muon is a straight line connecting the incident point of each muon on the radioactive material container and the scattering point of each muon in the radioactive material container, and the exit trajectory of each muon is a straight line connecting the exit point of each muon on the radioactive material container and the scattering point of each muon in the radioactive material container; before the step of determining the target trajectory count values ​​of the multiple spatial units according to the distances between the trajectory of each muon passing through the radioactive material container and the multiple spatial units, it includes: respectively calculating a first distance from the center point of the target spatial unit to the incident trajectory of the target muon, and a second distance from the center point of the target spatial unit to the exit trajectory of the target muon; selecting the maximum value of the first distance and the second distance as the distance between the trajectory of the target muon passing through the radioactive material container and the target spatial unit; wherein the target spatial unit is any spatial unit among the multiple spatial units; and the target muon is any muon among the multiple muons.

[0010] In one embodiment, the step of determining the density distribution data of the radioactive material in the radioactive material container based on the target track count values ​​of the multiple spatial units and the volume and mass of the radioactive material container includes: determining the overall density of the radioactive material in the radioactive material container based on the volume and mass of the radioactive material container; determining the density ratio of the radioactive material in the radioactive material container in the multiple spatial units based on the target track count values ​​of the multiple spatial units; determining the density distribution data of the radioactive material in the radioactive material container based on the density ratio of the radioactive material in the radioactive material container in the multiple spatial units and the overall density of the radioactive material in the radioactive material container.

[0011] In one embodiment, the efficiency calibration data of the radioactive material container includes the detection efficiency of at least one area in the radioactive material container; the step of determining the activity of the radioactive material in the radioactive material container based on the efficiency calibration data of the radioactive material container includes: obtaining gamma energy spectrum data of at least one area in the radioactive material container obtained by detecting gamma rays released by the radioactive material in the radioactive material container, the gamma energy spectrum data including energy values ​​in the gamma energy spectrum and counting rates corresponding to the energy values; determining the activity of the nuclides of the radioactive material in at least one area in the radioactive material container based on the detection efficiency of at least one area in the radioactive material container, the energy values ​​in the gamma energy spectrum and the counting rates corresponding to the energy values.

[0012] The present application also provides an activity acquisition system for radioactive materials, including a density distribution module, an efficiency calibration module and an activity acquisition module; the density distribution module is used to determine the density distribution data of the radioactive material in the radioactive material container according to the muon scanning information of the radioactive material container; the muon scanning information is scanning information obtained by performing scattering imaging scanning on the radioactive material container using multiple muons; the efficiency calibration module is used to perform efficiency calibration on the radioactive material container through passive efficiency calibration software based on the density distribution data of the radioactive material in the radioactive material container to obtain the efficiency calibration data of the radioactive material container; the activity acquisition module is used to determine the activity of the radioactive material in the radioactive material container according to the efficiency calibration data of the radioactive material container.

[0013] The present application also provides an electronic device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the above-mentioned activity acquisition method when executing the computer program.

[0014] The present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned activity acquisition method is implemented.

[0015] The present application provides a method and product for obtaining the activity of radioactive materials. By using multiple muons to perform scattering imaging scanning on a radioactive material container, muon scanning information of the radioactive material container is obtained, and the density distribution data of the radioactive material in the radioactive material container is determined based on the muon scanning information. On the one hand, the method makes full use of the high energy and strong penetration of muons, and is a natural non-destructive elementary particle "probe" that can image and non-destructively detect objects. On the other hand, the method makes full use of the scattering imaging scanning to reconstruct the track of muons before and after penetrating the object, and has the characteristics of high imaging accuracy, etc., and can accurately determine the density distribution of radioactive materials in the radioactive material container. Further, based on the density distribution data of the radioactive material in the radioactive material container, the radioactive material container is efficiency calibrated, and the activity of the radioactive material in the radioactive material container is determined, which can improve the accuracy of the efficiency calibration of the radioactive material container and the accuracy of determining the activity of the radioactive material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic flow chart of an embodiment of a method for obtaining activity of radioactive materials provided in the present application;

[0017] Figure 2 is a schematic diagram of scattering points of an embodiment of a method for obtaining activity of a radioactive material provided by the present application;

[0018] Figure 3It is a specific flow chart of an embodiment of the method for obtaining the activity of radioactive materials provided in the present application;

[0019] Figure 4 It is another specific flow chart of an embodiment of the method for obtaining the activity of radioactive materials provided by the present application;

[0020] Figure 5 It is a structural schematic diagram of the activity acquisition system of radioactive materials provided in this application;

[0021] Figure 6 is a schematic structural diagram of an embodiment of an electronic device provided by the present application;

[0022] Figure 7 It is a structural schematic diagram of another embodiment of the electronic device provided by the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0024] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0025] The method for obtaining the activity of radioactive materials provided in the embodiments of the present application can be applied to a terminal, can be applied to a server, and can also be software running in a terminal or a server. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc.; the server can be configured as an independent physical server, or a server cluster or a distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application that implements the method for obtaining the activity of radioactive materials, etc., but is not limited to the above forms.

[0026] The method for obtaining the activity of a radioactive material provided in the embodiment of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0027] See also Figure 1 The present application embodiment provides a method for obtaining the activity of a radioactive material, comprising:

[0028] Step S101: using multiple muons to perform scattering imaging scanning on a radioactive material container to obtain muon scanning information of the radioactive material container;

[0029] Step S102: Determine density distribution data of the radioactive material in the radioactive material container according to the muon scanning information;

[0030] Step S103: Based on the density distribution data of the radioactive material in the radioactive material container, the efficiency of the radioactive material container is calibrated by the passive efficiency calibration software to obtain the efficiency calibration data of the radioactive material container;

[0031] Step S104: determining the activity of the radioactive material in the radioactive material container according to the efficiency calibration data of the radioactive material container.

[0032] The embodiments of the present application provide a method and product for obtaining the activity of radioactive materials. By using multiple muons to perform scattering imaging scanning on a radioactive material container, muon scanning information of the radioactive material container is obtained, and the density distribution data of the radioactive material in the radioactive material container is determined based on the muon scanning information. On the one hand, the method makes full use of the high energy and strong penetration of muons, and is a natural non-destructive elementary particle "probe" that can image and non-destructively detect objects. On the other hand, the method makes full use of the scattering imaging scanning to reconstruct the track of muons before and after penetrating the object, and has the characteristics of high imaging accuracy, and can accurately determine the density distribution of radioactive materials in the radioactive material container. Further, based on the density distribution data of the radioactive material in the radioactive material container, the radioactive material container is efficiency calibrated, and the activity of the radioactive material in the radioactive material container is determined, which can improve the accuracy of the efficiency calibration of the radioactive material container and the accuracy of determining the activity of the radioactive material.

[0033] The muon scanning information in the above step S101 may include, but is not limited to, a first track of each muon of the plurality of muons emitted into the radioactive material container detected by the first detector, a second track of each muon emitted from the radioactive material container detected by the second detector, or an image of the radioactive material in the radioactive material container.

[0034] Muons mainly come from cosmic rays and accelerators. In actual implementation, a first detector and a second detector can be placed on opposite sides of a radioactive material container. Muons will first pass through the first detector, then penetrate the radioactive waste container, and then pass through the second detector. The first detector can detect the first track of each muon of multiple muons entering the radioactive material container, and the second detector can detect the second track of each muon emitted from the radioactive material container. In addition, in the process of penetrating the radioactive material container, some muons will collide with the radioactive material in the radioactive material container and scatter, so that there is an angle difference between the first track and the second track of some muons. This angle difference can also be called a scattering angle. The scattering angle of each muon can be used to perform scattering imaging of the radioactive material container and determine the image of the radioactive material in the radioactive material container.

[0035] In one embodiment, the above step S102: determining the density distribution data of the radioactive material in the radioactive material container according to the muon scanning information includes:

[0036] The image of the radioactive material in the radioactive material container is analyzed to determine the density distribution data of the radioactive material in the radioactive material container.

[0037] The embodiment of the present application analyzes the radioactive material image obtained by performing a scattering imaging scan on the radioactive material container to determine the density distribution data of the radioactive material in the radioactive material container, thereby improving the accuracy of the radioactive material density distribution data, and further improving the accuracy of efficiency calibration of the radioactive material container based on the radioactive material density distribution data, as well as the accuracy of determining the activity of the radioactive material in the radioactive material container based on the efficiency calibration of the radioactive material container.

[0038] Optionally, the intersection of the first trajectory of each muon injected into the radioactive material container and the radioactive material container is the incident point of each muon on the radioactive material container, and the intersection of the second trajectory of each muon emitted from the radioactive material container and the radioactive material container is the exit point of each muon on the radioactive material container.

[0039] In another embodiment, the above step S102: determining the density distribution data of the radioactive material in the radioactive material container according to the muon scanning information includes:

[0040] The midpoint of the common perpendicular line between the first track and the second track of each muon is determined as the scattering point of each muon in the radioactive material container;

[0041] Based on the incident point and the exit point of each muon on the radioactive material container and the scattering point of each muon in the radioactive material container, the track of each muon passing through the radioactive material container is determined;

[0042] Divide the radioactive material container into multiple space units;

[0043] Determining target track count values ​​of the plurality of spatial units according to the distances between the tracks of the muons passing through the radioactive material container and the plurality of spatial units;

[0044] The density distribution data of the radioactive material in the radioactive material container is determined according to the target track count values ​​of the plurality of space units, the volume and the mass of the radioactive material container.

[0045] Optionally, the trajectory of each muon passing through the radioactive material container includes an incident trajectory and an exit trajectory of each muon, wherein the incident trajectory of each muon is a straight line connecting the incident point of each muon on the radioactive material container and the scattering point of each muon in the radioactive material container, and the exit trajectory of each muon is a straight line connecting the exit point of each muon on the radioactive material container and the scattering point of each muon in the radioactive material container. Figure 2 As shown, the incident track of the muon μ (straight line L1) is obtained by connecting the incident point a of the muon μ on the radioactive material container and the scattering point b of the muon μ in the radioactive material container, and the exit track of the muon μ (straight line L2) is obtained by connecting the exit point c of the muon μ on the radioactive material container and the scattering point b of the muon μ in the radioactive material container.

[0046] Optionally, based on the three-dimensional shape of the radioactive material container, the radioactive material container can be divided into multiple space units of corresponding shapes. For example, if the three-dimensional shape of the radioactive material container is a cube, the radioactive material container can be divided into multiple cube space units. If the three-dimensional shape of the radioactive material container is a sphere, the radioactive material container can be divided into multiple spherical space units.

[0047] The embodiment of the present application divides the radioactive material container into multiple spatial units, and determines the target track count values ​​of the multiple spatial units based on the distance between the track of each muon passing through the radioactive material container and the multiple spatial units. This can refine the density distribution of the radioactive material in the radioactive material container to the spatial unit dimension, and further obtain accurate radioactive material density distribution data based on the target track count values ​​of the multiple spatial units, thereby improving the accuracy of efficiency calibration of the radioactive material container based on the radioactive material density distribution data, and the accuracy of determining the activity of the radioactive material in the radioactive material container based on the efficiency calibration of the radioactive material container.

[0048] like Figure 3 As shown, the above method of determining target track count values ​​of multiple space units based on the distances between the tracks of each muon passing through the radioactive material container and the multiple space units includes:

[0049] Step S201: Based on the i-th time length, select the i-th time period from the time period during which the first detector detects each muon injected into the radioactive material container. 1 Time period and i 2 time period; among them, the i 1 Time period and i 2 The time periods are continuous and the duration is the length of the i-th time period;

[0050] Step S202: According to the i 1 The distance between the track of each muon passing through the radioactive material container and multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 1 Track count value;

[0051] Step S203: According to the i 2 The distance between the track of each muon passing through the radioactive material container and multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 2 Track count value;

[0052] Step S204: Obtain the i-th 1 The track count value and the i-th 2 The error of the track count value;

[0053] Step S205: Determine the i-th spatial unit 1 The track count value and the i-th 2 Whether the errors of the track count values ​​are within the preset range;

[0054] If the i-th of multiple spatial units 1 The track count value and the i-th 2 If the error of the track count value is within the preset range, step S206 is executed: the i-th track count value of the plurality of spatial units is 1 The track count value or the i-th 2 track count values ​​as target track count values ​​of multiple space units;

[0055] If the i-th of multiple spatial units 1 The track count value and the i-th 2 If any of the errors of the track count values ​​does not meet the preset range, step S207 is executed: i is updated to i+1, and the process returns to step S201.

[0056] For example, the i-th time length = 5 minutes, the time period during which the first detector detects each muon injected into the radioactive material container is 8:00-8:30, and the i-th time length is selected. 1 The time period is 8:00-8:05, and the i-th 2 The time period is 8:05-8:10. 1The distance between the track of each muon passing through the radioactive material container and multiple spatial units of the radioactive material container during the time period is determined to determine the i-th spatial unit of the multiple spatial units. 1 track count values, and based on the i-th 2 The distance between the track of each muon passing through the radioactive material container and multiple spatial units of the radioactive material container during the time period is determined to determine the i-th spatial unit of the multiple spatial units. 2 For each of the multiple spatial units, count the i-th track count value. 1 The track count value and the i-th 2 The error of the track count value is obtained by calculating the i-th track count value of each spatial unit in the multiple spatial units. 1 The track count value and the i-th 2 The error of the track count value.

[0057] If the i-th spatial unit of each spatial unit in the plurality of spatial units 1 The track count value and the i-th 2 If the error of each track count value meets the preset range (e.g., -10% ≤ error ≤ 10%), it can be considered that the effective muon events for scattering imaging scanning of the radioactive material container using multiple muons have reached a sufficient amount, and the i-th track count of each of the multiple space units can be 1 The track count value or the i-th 2 The track count values ​​are used as the target track count values ​​of each spatial unit. 1 The track count value and the i-th 2 If any error of the target track count value of any spatial unit does not meet the preset range (such as the target track count value of any spatial unit <-10%, or the target track count value of any spatial unit >10%), it can be considered that the effective muon event of using multiple muons to perform scattering imaging scanning on the radioactive material container is insufficient, and the next i+1 time length can be selected, such as the i+1 time length = 10 minutes, and based on the i+1 time length, the (i+1)th time length is selected from the time period of the first detector detecting each muon injected into the radioactive material container. 1 Time period, such as 8:00-8:05, and (i+2) 2 In a time period, such as 8:05-8:10, the above steps are repeated until sufficient effective muon events are achieved for scattering imaging scanning of the radioactive material container using multiple muons, and the track count value or track count value of each spatial unit in the multiple spatial units at this time is used as the target track count value of each spatial unit.

[0058] The embodiment of the present application can accurately determine the target track count value of each of the multiple spatial units by comparing the track count value errors in any two adjacent and equal time periods in the time period when the first detector detects each muon being injected into the radioactive material container, thereby improving the accuracy of determining the density distribution data of the radioactive material in the radioactive material container based on the target track count value of each of the multiple spatial units.

[0059] In one embodiment, the above step S202: according to the i 1 The distance between the track of each muon passing through the radioactive material container and multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 1 Track count values, or, the above step S203: according to the i-th 2 The distance between the track of each muon passing through the radioactive material container and multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 2 Track count values, including:

[0060] Get the i-th n The track of the 1st to mth muon passing through the radioactive material container in the time period, and the 1st to mth distance from the first spatial unit; where m is the i-th muon detected by the first detector n The total number of muons injected into the container of radioactive material during a period of time;

[0061] According to the relationship between the first distance to the mth distance and the distance threshold of the first spatial unit, the first track count value to the mth track count value of the first spatial unit are determined; wherein, if the rth distance of the first spatial unit is less than the distance threshold of the first spatial unit, the rth track count value of the first spatial unit is 1, 1≤r≤m; if the tth distance of the first spatial unit is greater than or equal to the distance threshold of the first spatial unit, the tth track count value of the first spatial unit is 0, 1≤t≤m;

[0062] The 1st track count value to the mth track count value of the first spatial unit are summed to determine the i-th track count value of the first spatial unit. n Track count value;

[0063] Among them, i n =i 1 or 2 , the first spatial unit is any spatial unit among the multiple spatial units.

[0064] Optionally, the distance threshold of the spatial unit can be flexibly selected according to the shape of the spatial unit. For example, if the spatial unit is a cube, the side length of the spatial unit can be selected as the distance threshold of the spatial unit. If the spatial unit is a sphere, the radius of the spatial unit can be selected as the distance threshold of the spatial unit.

[0065] For example, assuming that the i n The total number of muons injected into the radioactive material container during the time period is 10. First, obtain the i-th n The tracks of the 1st to 10th muons passing through the radioactive material container in the time period are the 1st distance to the 10th distance from the first spatial unit; then, according to the relationship between the 1st distance to the 10th distance and the distance threshold of the first spatial unit, the 1st track count value to the 10th track count value of the first spatial unit are determined, wherein, if the 1st distance to the 5th distance are all less than the distance threshold, and the 6th distance to the 10th distance are all greater than the distance threshold, then the 1st track count value to the 5th track count value of the first spatial unit are all 1, and the 6th track count value to the 10th track count value are all 0; finally, the 1st track count value to the 10th track count value of the first spatial unit are summed up respectively to obtain the i-th track count value of the first spatial unit. n The count value of each track is 5.

[0066] The embodiment of the present application compares the first n The relationship between the distance between the track of each muon passing through the radioactive material container and the first spatial unit in the time period and the distance threshold of the first spatial unit is used to determine multiple track count values ​​of the first spatial unit, and then the multiple track count values ​​of the first spatial unit are summed to obtain the i-th track count value of the first spatial unit. n The track count value can ensure that the i-th n Based on the accuracy of the track count value, the i-th n The efficiency of the track counting values ​​can be improved, thereby ensuring the accuracy of determining the target track counting values ​​of each spatial unit in multiple spatial units and determining the density distribution data of radioactive materials in radioactive material containers, and improving the efficiency of determining the target track counting values ​​of each spatial unit in multiple spatial units and determining the density distribution data of radioactive materials in radioactive material containers.

[0067] In another embodiment, Figure 4 As shown, the above step S202: according to the i 1 The distance between the track of each muon passing through the radioactive material container and multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 1 Track count values, or, the above step S203: according to the i-th 2The distance between the track of each muon passing through the radioactive material container and multiple space units in the time period is determined to determine the i-th space unit of the multiple space units. 2 Track count values, including:

[0068] Step S301: Get the i-th n the distance between the track of the m-th muon passing through the radioactive material container and the second spatial unit in the time period, and the m-th relationship between the track and the distance threshold of the second spatial unit;

[0069] Step S302: Determine the mth track count value of the second spatial unit according to the mth relationship; wherein, if the i-th n If the distance between the track of the m-th muon passing through the radioactive material container and the second spatial unit in the time period is less than the distance threshold of the second spatial unit, then 1 is added to the current track count value of the second spatial unit to obtain the m-th track count value of the second spatial unit; if the i-th n If the distance between the track of the m-th muon passing through the radioactive material container and the second spatial unit in the time period is greater than or equal to the distance threshold of the second spatial unit, the current track count value of the second spatial unit is kept unchanged, and the m-th track count value of the second spatial unit is obtained;

[0070] Step S303: Determine whether the mth muon is the i-th n The last muon injected into the container of radioactive material during the time period;

[0071] If the mth muon is the i-th n If the last muon is injected into the radioactive material container within the time period, then step S304 is executed: the mth track count value is determined as the i-th track count value of the second spatial unit. n Track count value;

[0072] If the mth muon is not the ith n The last muon injected into the radioactive material container within the time period, then execute step S305: update m to m+1, and return to execute step S301;

[0073] Among them, i n =i 1 or 2 , the second spatial unit is any spatial unit among the multiple spatial units, the initial value of m is 1, and the initial values ​​of the current track count values ​​of the multiple spatial units are equal.

[0074] Optionally, the initial values ​​of the current track count values ​​of the multiple spatial units are all 0. For example, assuming that the i-th n The total number of muons injected into the radioactive material container during the time period is 3. First, obtain the i-th nThe first relationship between the distance between the track of the first muon passing through the radioactive material container and the second spatial unit and the distance threshold of the second spatial unit in the time period is assumed to be n If the distance between the track of the first muon passing through the radioactive material container and the second spatial unit in the time period is less than the distance threshold of the second spatial unit, then 1 is added to the initial value of the current track count value of the second spatial unit to obtain the first track count value of the second spatial unit as 1. n The last muon injected into the radioactive material container within the time period, then continue to obtain the i-th n The second relationship between the distance between the track of the second muon passing through the radioactive material container and the second spatial unit and the distance threshold of the second spatial unit in the time period is assumed to be n If the distance between the track of the second muon passing through the radioactive material container and the second spatial unit in the time period is greater than the distance threshold of the second spatial unit, the current track count value of the second spatial unit is kept unchanged, and the second track count value of the second spatial unit is still 1.

[0075] Since the second muon is not the i-th n The last muon injected into the radioactive material container within the time period, then continue to obtain the i-th n The third relationship between the distance between the track of the third muon passing through the radioactive material container and the second spatial unit and the distance threshold of the second spatial unit in the time period is assumed to be n If the distance between the track of the third muon passing through the radioactive material container and the second spatial unit is less than the distance threshold of the second spatial unit, then 1 is added to the current track count value of the second spatial unit, and the third track count value of the second spatial unit is 2. n The last muon injected into the radioactive material container during the time period can be determined as the third track count value of the second spatial unit. n The track count value, i.e., the i-th track count value of the second spatial unit n The track count value is 2.

[0076] The present embodiment compares the i n The relationship between the distance between the track of the first muon to the last muon passing through the radioactive material container and the second spatial unit in the time period and the distance threshold of the second spatial unit is used to update the current track count value of the second spatial unit in sequence, and the final update result of the current track count value of the second spatial unit is used as the i-th track count value of the second spatial unit. n The track count value can improve the determination of the second spatial unit i nThe accuracy of the track count value can be improved, thereby improving the accuracy of determining the target track count value of each spatial unit in multiple spatial units, and the accuracy of determining the density distribution data of the radioactive material in the radioactive material container.

[0077] Before determining the target track count values ​​of the plurality of spatial units according to the distances between the tracks of the muons passing through the radioactive material container and the plurality of spatial units, the method includes:

[0078] respectively calculating a first distance from the center point of the target space unit to the incident track of the target muon, and a second distance from the center point of the target space unit to the outgoing track of the target muon;

[0079] Selecting the maximum value of the first distance and the second distance as the distance between the track of the target muon passing through the radioactive material container and the target space unit;

[0080] The target space unit is any space unit among the multiple space units, and the target muon is any muon among the multiple muons.

[0081] In one embodiment, the distance between the track of the target muon passing through the radioactive material container and the target space unit may be determined based on the following formula:

[0082] D r =max(min||a(z)-c||,min||b(z)-c||)

[0083] Among them, D r represents the distance between the track of the target muon passing through the radioactive material container and the target space unit, min||a(z)-c|| represents the first distance from the center point of the target space unit to the incident track of the target muon, min||b(z)-c|| represents the second distance from the center point of the target space unit to the exit track of the target muon, a(z) represents the incident track of the target muon, b(z) represents the exit track of the target muon, z represents any point on the track of the target muon passing through the radioactive material container, and c represents the center point of the target space unit.

[0084] The present application is an embodiment in which the maximum value of a first distance from the center point of a target space unit to the incident track of a target muon and a second distance from the center point of a target space unit to the exit track of a target muon is selected as the distance between the track of a target muon passing through a radioactive material container and the target space unit. This can improve the accuracy of determining target track count values ​​of multiple space units based on the relationship between the distance between the track of each muon passing through the radioactive material container and multiple space units and a distance threshold, thereby improving the accuracy of determining the density distribution data of radioactive materials in a radioactive material container based on the target track count value of each space unit in the multiple space units.

[0085] The above method of determining the density distribution data of the radioactive material in the radioactive material container based on the target track count values ​​of the plurality of spatial units, the volume and mass of the radioactive material container, includes:

[0086] Determine the overall density of the radioactive material in the radioactive material container based on the volume and mass of the radioactive material container;

[0087] Determining density ratios of radioactive materials in the radioactive material container in the multiple spatial units according to target track count values ​​of the multiple spatial units;

[0088] The density distribution data of the radioactive material in the radioactive material container is determined according to the density proportion of the radioactive material in the radioactive material container in the plurality of space units and the overall density of the radioactive material in the radioactive material container.

[0089] Taking the radioactive material container as a radioactive material barrel as an example, the overall density of the radioactive material in the radioactive material container can be calculated by the following formula:

[0090] The total density of the radioactive material in the radioactive material container = (the weight of the radioactive material barrel filled with radioactive material - the weight of the empty radioactive material barrel) / the volume of the radioactive material barrel;

[0091] Furthermore, the density ratio of the radioactive material in the radioactive material container in the i-th space unit can be calculated by the following formula:

[0092] The density ratio of radioactive materials in the ith spatial unit = the target track count value of the ith spatial unit / the sum of the target track count values ​​of multiple spatial units;

[0093] Furthermore, the density of radioactive materials in the i-th spatial unit can be calculated by the following formula:

[0094] The density distribution value of the radioactive material in the i-th spatial unit = the density proportion of the radioactive material in the i-th spatial unit × the total density of the radioactive material in the radioactive material container;

[0095] The embodiment of the present application determines the density ratio of radioactive materials in multiple spatial units based on the target track count values ​​of multiple spatial units, and can obtain accurate radioactive material density distribution data, thereby improving the accuracy of efficiency calibration of radioactive material containers based on radioactive material density distribution data, and the accuracy of determining the activity of radioactive materials in radioactive material containers based on the efficiency calibration of radioactive material containers.

[0096] The above step S103: based on the density distribution data of the radioactive material in the radioactive material container, the efficiency of the radioactive material container is calibrated by the passive efficiency calibration software to obtain the efficiency calibration data of the radioactive material container, including:

[0097] Obtaining a three-dimensional model of a radioactive material container, material information of the radioactive material in the radioactive material container, energy spectrum type for efficiency calibration of the radioactive material container and activity of the radioactive source;

[0098] The density distribution data of the radioactive material in the radioactive material container, the three-dimensional model of the radioactive material container, the material information of the radioactive material in the radioactive material container, and the energy spectrum type and the activity of the radioactive source used for efficiency calibration of the radioactive material container are configured into the passive efficiency calibration software;

[0099] The efficiency of the radioactive material container is calibrated by the passive efficiency calibration software to obtain the efficiency calibration data of the radioactive material container.

[0100] Optionally, the material information of the radioactive material includes information such as the radioactive material is made of fiber material or the radioactive material is made of resin material. The energy spectrum type used to calibrate the efficiency of the radioactive material container is a gamma (γ) ray energy spectrum (i.e., adding energy points). The radiation source used to calibrate the efficiency of the radioactive material container is a gamma (γ) ray radiation source, and the activity of the radiation source is the number of particles released by the radiation source per second.

[0101] Optionally, the density distribution data of the radioactive material in the radioactive material container, the three-dimensional model of the radioactive material container, the material information of the radioactive material in the radioactive material container, and the energy spectrum type and the activity of the radioactive source used for efficiency calibration of the radioactive material container are configured into the passive efficiency calibration software, and the passive efficiency calibration software will perform efficiency calibration on the radioactive material container, and finally output the efficiency calibration data of the radioactive material container in the form of an efficiency calibration fitting curve. It is worth mentioning that if the efficiency calibration of the radioactive material container is performed in different regions, the obtained efficiency calibration data of the radioactive material container includes the detection efficiency of at least one region in the radioactive material container.

[0102] The embodiment of the present application is based on radioactive material density distribution data determined by muon scanning information obtained by performing scattering imaging scanning of a radioactive material container using multiple muons, and efficiency calibration of the radioactive material container is performed through passive efficiency calibration software, which can improve the efficiency and accuracy of the efficiency calibration of the radioactive material container, and improve the efficiency and accuracy of determining the activity of the radioactive material in the radioactive material container based on the efficiency calibration of the radioactive material container.

[0103] The above step S104: determining the activity of the radioactive material in the radioactive material container according to the efficiency calibration data of the radioactive material container, includes:

[0104] Acquiring gamma energy spectrum data of at least one area in the radioactive material container obtained by detecting gamma rays released by the radioactive material in the radioactive material container, the gamma energy spectrum data including energy values ​​in the gamma energy spectrum and count rates corresponding to the energy values;

[0105] The activity of nuclides of radioactive materials in at least one area of ​​the radioactive material container is determined according to the detection efficiency of at least one area in the radioactive material container, the energy values ​​in the gamma energy spectrum and the counting rates corresponding to the energy values.

[0106] Optionally, the gamma rays released by the radioactive material in at least one area of ​​the radioactive material container for efficiency calibration can be detected by any scanning method including segmented scanning, tomographic scanning, and dual-detector spiral scanning to obtain gamma energy spectrum data of at least one area in the radioactive material container. According to the energy value in the gamma energy spectrum of at least one area in the radioactive material container, the nuclide of the radioactive material in at least one area in the radioactive material container can be determined, and according to the detection efficiency of at least one area in the radioactive material container, the energy value in the gamma energy spectrum, and the counting rate corresponding to the energy value, the activity of the nuclide of the radioactive material in at least one area in the radioactive material container can be determined.

[0107] The embodiment of the present application first determines the density distribution data of the radioactive material in the radioactive material container based on the muon scanning information obtained by performing scattering imaging scanning on the radioactive material container by multiple muons, and then, based on the density distribution data of the radioactive material in the radioactive material container, performs efficiency calibration on the radioactive material container through passive efficiency calibration software to obtain efficiency calibration data of at least one area in the radioactive material container, and finally, based on the efficiency calibration data and gamma spectrum data of at least one area in the radioactive material container, determines the nuclides and the activity of the nuclides of the radioactive material in at least one area in the radioactive material container, which can not only improve the accuracy of the efficiency calibration of the radioactive material container, but also improve the accuracy of determining the activity of the radioactive material, especially when there is uneven density distribution of the radioactive material in the radioactive material container, which can significantly improve the accuracy of the efficiency calibration of the radioactive material container and the accuracy of determining the activity of the radioactive material.

[0108] See also Figure 5 The embodiment of the present application further provides a radioactive material activity acquisition system 400, which can implement the above radioactive material activity acquisition method, the system comprising: a scanning module 401, a density distribution module 402, an efficiency calibration module 403 and an activity acquisition module 404;

[0109] The scanning module 401 is used to perform scattering imaging scanning on the radioactive material container using multiple muons to obtain muon scanning information of the radioactive material container;

[0110] The density distribution module 402 is used to determine the density distribution data of the radioactive material in the radioactive material container according to the muon scanning information;

[0111] The efficiency calibration module 403 is used to perform efficiency calibration on the radioactive material container through the passive efficiency calibration software based on the density distribution data of the radioactive material in the radioactive material container to obtain the efficiency calibration data of the radioactive material container;

[0112] The activity acquisition module 404 is used to determine the activity of the radioactive material in the radioactive material container according to the efficiency calibration data of the radioactive material container.

[0113] The activity acquisition system for radioactive materials provided in the embodiment of the present application can implement each step of the above-mentioned activity acquisition method for radioactive materials and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0114] Alternatively, if Figure 6 As shown, the embodiment of the present application further provides an electronic device 500, including a processor 501 and a memory 502, the memory 502 stores a program or instruction that can be run on the processor 501, and the program or instruction is executed by the processor 501 to implement the various steps of the above-mentioned radioactive material activity acquisition method embodiment, and can achieve the same technical effect, to avoid repetition, it is not repeated here. It should be noted that the electronic device in the embodiment of the present application includes the above-mentioned mobile electronic device and non-mobile electronic device.

[0115] Figure 7 A schematic diagram of the hardware structure of an electronic device for implementing an embodiment of the present application is provided, wherein the electronic device includes:

[0116] The processor 601 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0117] The memory 602 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 602 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 602, and the processor 601 calls and executes the method for obtaining the activity of radioactive materials in the embodiment of this application;

[0118] Input / output interface 603, used to implement information input and output;

[0119] Communication interface 604, used to realize communication interaction between the device and other devices, which can be realized by wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WIFI, Bluetooth, etc.);

[0120] Bus 605 , which transmits information between various components of the device (e.g., processor 601 , memory 602 , input / output interface 603 , and communication interface 604 );

[0121] The processor 601 , the memory 602 , the input / output interface 603 and the communication interface 604 are connected to each other in communication within the device via a bus 605 .

[0122] The electronic device provided in the embodiment of the present application can implement each step of the above-mentioned embodiment of the method for obtaining the activity of radioactive materials, and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0123] An embodiment of the present application also provides a computer-readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each step of the above-mentioned method for obtaining the activity of radioactive materials is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0124] The processor is the processor in the electronic device described in the above embodiment. The computer-readable storage medium includes a computer-readable storage medium such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0125] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various steps of the above-mentioned embodiment of the method for obtaining the activity of radioactive materials, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0126] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0127] An embodiment of the present application provides a computer program product, which is stored in a storage medium. The program product is executed by at least one processor to implement the various steps of the above-mentioned method for obtaining the activity of radioactive materials, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0128] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0129] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0130] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for obtaining the activity of a radioactive material, characterized in that: include: Using a plurality of muons to perform scattering imaging scanning on a radioactive material container to obtain muon scanning information of the radioactive material container; Determining density distribution data of the radioactive material in the radioactive material container according to the muon scanning information; Based on the density distribution data of the radioactive material in the radioactive material container, the efficiency of the radioactive material container is calibrated by passive efficiency calibration software to obtain efficiency calibration data of the radioactive material container; The activity of the radioactive material in the radioactive material container is determined according to the efficiency calibration data of the radioactive material container.

2. The activity acquisition method according to claim 1, characterized in that: The muon scanning information includes a first track of each muon of the plurality of muons injected into the radioactive material container detected by the first detector, and a second track of each muon emitted from the radioactive material container detected by the second detector; the first detector and the second detector are respectively located on two opposite sides of the radioactive material container; the intersection of the first track of each muon injected into the radioactive material container and the radioactive material container is the incident point of each muon on the radioactive material container, and the intersection of the second track of each muon emitted from the radioactive material container and the radioactive material container is the exit point of each muon on the radioactive material container; The step of determining the density distribution data of the radioactive material in the radioactive material container according to the muon scanning information comprises: Determine the midpoint of the common perpendicular line between the first track and the second track of each muon as the scattering point of each muon in the radioactive material container; Determining the track of each muon passing through the radioactive material container based on the incident point, the exit point, and the scattering point of each muon on the radioactive material container; Dividing the radioactive material container into a plurality of space units; Determining target track count values ​​of the plurality of spatial units according to the distances between the tracks of the muons passing through the radioactive material container and the plurality of spatial units; The density distribution data of the radioactive material in the radioactive material container is determined according to the target track count values ​​of the plurality of spatial units and the volume and mass of the radioactive material container.

3. The activity acquisition method according to claim 2, characterized in that: The step of determining the target track count values ​​of the plurality of spatial units according to the distance between the track of each muon passing through the radioactive material container and the plurality of spatial units comprises: Based on the i-th time length, selecting the i1-th time period and the i2-th time period from the time period during which the first detector detects each muon being injected into the radioactive material container; wherein the i1-th time period and the i2-th time period are continuous in time and both have a time length equal to the i-th time length; Determine an i1th track count value of the plurality of spatial units according to the distance between the track of each muon passing through the radioactive material container and the plurality of spatial units in the i1th time period; Determine an i2th track count value of the plurality of spatial units according to the distance between the track of each muon passing through the radioactive material container and the plurality of spatial units in the i2th time period; respectively obtaining the errors between the i1th track count value and the i2th track count value of the plurality of spatial units; If the errors between the i1th track count value and the i2th track count value of the plurality of spatial units are both within a preset range, the i1th track count value or the i2th track count value of the plurality of spatial units is used as the target track count value of the plurality of spatial units; If any error between the i1th track count value and the i2th track count value of the multiple spatial units does not meet the preset range, i is updated to i+1, and the step of selecting the i1th time period and the i2th time period from the time period in which the first detector detects each muon being injected into the radioactive material container based on the i-th time length is returned to be executed.

4. The activity acquisition method according to claim 3, characterized in that: The step of determining the i1th track count value of the multiple spatial units according to the distance between the track of each muon passing through the radioactive material container and the multiple spatial units in the i1th time period, or the step of determining the i2th track count value of the multiple spatial units according to the distance between the track of each muon passing through the radioactive material container and the multiple spatial units in the i2th time period, comprises: Get the i-th n The track of the 1st muon to the mth muon passing through the radioactive material container within the time period, and the 1st distance to the mth distance from the first spatial unit; wherein m is the distance of the i-th muon detected by the first detector. n The total number of muons injected into the radioactive material container during a time period; According to the relationship between the first distance to the mth distance and the distance threshold of the first spatial unit, respectively, determine the first track count value to the mth track count value of the first spatial unit; wherein, if the rth distance of the first spatial unit is less than the distance threshold of the first spatial unit, the rth track count value of the first spatial unit is 1, 1≤r≤m; if the tth distance of the first spatial unit is greater than or equal to the distance threshold of the first spatial unit, the tth track count value of the first spatial unit is 0, 1≤t≤m; The ith track count value of the first spatial unit is summed to determine the ith track count value of the first spatial unit. n Track count value; Among them, i n =i1 or i2, the first spatial unit is any spatial unit among multiple spatial units.

5. The activity acquisition method according to claim 2, characterized in that: The track of each muon passing through the radioactive material container includes an incident track and an exit track of each muon; wherein the incident track of each muon is a straight line connecting the incident point of each muon on the radioactive material container and the scattering point of each muon in the radioactive material container, and the exit track of each muon is a straight line connecting the exit point of each muon on the radioactive material container and the scattering point of each muon in the radioactive material container; Before the step of determining the target track count values ​​of the plurality of spatial units according to the distances between the tracks of the muons passing through the radioactive material container and the plurality of spatial units, the method includes: respectively calculating a first distance from the center point of the target space unit to the incident track of the target muon, and a second distance from the center point of the target space unit to the exit track of the target muon; selecting the maximum value of the first distance and the second distance as the distance between the track of the target muon passing through the radioactive material container and the target space unit; Among them, the target space unit is any space unit among the multiple space units; the target muon is any muon among the multiple muons.

6. The activity acquisition method according to claim 2, characterized in that: The step of determining the density distribution data of the radioactive material in the radioactive material container according to the target track count values ​​of the plurality of spatial units, the volume and mass of the radioactive material container, comprises: Determining the overall density of the radioactive material in the radioactive material container according to the volume and mass of the radioactive material container; Determining density ratios of the radioactive material in the radioactive material container in the multiple spatial units according to the target track count values ​​of the multiple spatial units; The density distribution data of the radioactive material in the radioactive material container is determined according to the density ratio of the radioactive material in the radioactive material container in the multiple space units and the overall density of the radioactive material in the radioactive material container.

7. The activity acquisition method according to claim 1, characterized in that: The efficiency calibration data of the radioactive material container includes the detection efficiency of at least one area in the radioactive material container; The step of determining the activity of the radioactive material in the radioactive material container according to the efficiency calibration data of the radioactive material container comprises: Acquiring gamma energy spectrum data of at least one area in the radioactive material container obtained by detecting gamma rays released by the radioactive material in the radioactive material container, wherein the gamma energy spectrum data includes energy values ​​in the gamma energy spectrum and count rates corresponding to the energy values; The activity of nuclides of the radioactive material in at least one area in the radioactive material container is determined according to the detection efficiency of at least one area in the radioactive material container, the energy value in the gamma energy spectrum and the counting rate corresponding to the energy value.

8. A system for acquiring activity of radioactive materials, characterized in that: It includes scanning module, density distribution module, efficiency calibration module and activity acquisition module; The scanning module is used to perform scattering imaging scanning on the radioactive material container using multiple muons to obtain muon scanning information of the radioactive material container; The density distribution module is used to determine the density distribution data of the radioactive material in the radioactive material container according to the muon scanning information; The efficiency calibration module is used to perform efficiency calibration on the radioactive material container through passive efficiency calibration software based on the density distribution data of the radioactive material in the radioactive material container to obtain efficiency calibration data of the radioactive material container; The activity acquisition module is used to determine the activity of the radioactive material in the radioactive material container according to the efficiency calibration data of the radioactive material container.

9. An electronic device, characterized in that: The electronic device comprises a memory and a processor, the memory stores a computer program, and the processor implements the activity acquisition method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the activity acquisition method according to any one of claims 1 to 7 is implemented.

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