Ionization gas chamber internal electric field modeling and radioactive interference suppression method

Abstract

The invention discloses an ionization chamber internal electric field modeling and radioactive interference suppression method. The method comprises the following steps: modeling by adopting a multi-physical simulation software package to obtain a geometric model of an ionization chamber; analyzing electric field distribution in the ionization chamber through finite element analysis software, and simulating a plurality of parameters by adopting a particle physical experiment simulation program to set a drift trajectory and a drift end point of secondary electrons so as to obtain ionization chamber parameters meeting conditions; and optimizing the ionization gas chamber according to the ionization gas chamber parameters meeting the conditions, and monitoring and outputting particle drift and current induction results based on the optimized ionization gas chamber. The radiation interference caused by the detector can be shielded on the basis of the original functions of the traditional ionization gas chamber, and the background emissivity of the alpha particle measuring device is reduced, so that the detection efficiency and accuracy of low-level radioactive measurement are improved.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear radiation dose and radiation protection, and in particular to a method for modeling electric fields inside an ionization chamber and suppressing radioactive interference. Background Art

[0002] Dark matter is believed to be a substance that accounts for about 80% of all matter in the universe. Dark matter detection has become a hot area of ​​research in various countries. Currently, dark matter detection experiments are being conducted all over the world, using particle detectors to monitor rare interactions between dark matter particles and matter. Due to the continuous bombardment of the Earth's atmosphere by cosmic rays, it is necessary to avoid unnecessary interactions caused by cosmic rays. Therefore, the sensitivity of the detector becomes extremely important. In addition to cosmic ray interactions, particle detectors must also pay attention to radioactivity that accumulates on the detector surface and surrounding materials due to the decay of radon particles in the surrounding air. 210 Pb elements. All of these decay sources interfere with the search for dark matter. To increase the sensitivity of dark matter detectors, experiments must be built with materials that are as radioactive as possible. Radioactive purity is achieved when there are no radioactive elements on or in the sample. Particle detectors can be used to verify that the material is clean enough.

[0003] The alpha particle detector is the most sensitive alpha particle counter on the market today, but it records not only the particles in the sample being studied, but also the alpha particles in the sample tray (i.e. the background). The particles from the tray are then the background events that you want to identify, the signal that needs to be excluded in order to increase the sensitivity of the particle detector. Distinguishing between alpha particles coming from the sample and not the tray allows for a more accurate characterization of the materials used to build dark matter experiments.

[0004] On the other hand, single-particle effects, soft errors, and device performance degradation caused by the ionization effect of alpha particles are important factors affecting the operating life and reliability of electronic devices and equipment. Alpha particles mainly come from ceramic materials, solder, and the wafer itself in device packaging. As the requirements for alpha particle emission rates continue to increase, it is hoped that the alpha surface emission rate of the above materials will be less than .

[0005] The background emission rate of conventional α-particle measurement devices is The level of ultra-low alpha particles cannot meet the measurement requirements of such low background samples. Therefore, it is necessary to study and break through ultra-low alpha particle electronic materials and detection technologies to solve the fundamental problem. Although relevant ionization gas chamber research has been carried out for ultra-low alpha surface emissivity measurement, a mature measurement system has not been formed, and there are currently no directly applicable measurement equipment and related technical standards. Although there are measuring instruments with the same purpose, the measurement capabilities still cannot fully cover the needs and cannot shield the radiation interference caused by the detector itself.

[0006] Therefore, the prior art needs to be improved. Summary of the invention

[0007] The technical problem to be solved by the present invention is that, in view of the defects of the prior art, the present invention provides an ionization chamber internal electric field modeling and radioactive interference suppression method to solve the problem that the existing ionization chamber detection method has low detection efficiency due to the inability to shield the radiation interference of the detector itself.

[0008] The technical solution adopted by the present invention to solve the technical problem is as follows: In a first aspect, the present invention provides a method for modeling an electric field inside an ionization chamber and suppressing radioactive interference, comprising: The geometric model of the ionization chamber is obtained by modeling using a multi-physics simulation software package; The electric field distribution inside the ionization chamber is analyzed by finite element analysis software, and the drift trajectory and drift end point of the secondary electrons are simulated by a particle physics experiment simulation program under various parameter settings to obtain ionization chamber parameters that meet the conditions; The ionization chamber is optimized according to the ionization chamber parameters that meet the conditions, and the particle drift and current sensing results are monitored and output based on the optimized ionization chamber.

[0009] In one implementation, the geometric model of the ionization chamber is obtained by modeling using a multi-physics simulation software package, including: The multi-physics simulation software package is used to model the ionization chamber, and the parallel plate electric field in the ionization chamber is simulated to obtain a geometric model of the ionization chamber.

[0010] In one implementation, the simulating the parallel plate electric field in the ionization chamber includes: Electric field simulations were performed based on samples with field distortion and samples without field distortion, respectively, and the corresponding parallel plate electric fields were obtained.

[0011] In one implementation, analyzing the electric field distribution inside the ionization chamber by finite element analysis software includes: Outputting the simulated parallel plate electric field as a set of grid points into a text file, and interpolating the grid points using the finite element analysis software to drift the electrons in the argon gas; The electric field distribution inside the ionization chamber is analyzed by the finite element analysis software.

[0012] In one implementation, the particle physics experiment simulation program is used to simulate the drift trajectory and drift endpoint of the secondary electron under the setting of multiple parameters, including: The particle physics experiment simulation program is used to simulate alpha particle drift and current induction in the anode under various parameter settings; The alpha particle drift trajectory and current induction data in the anode under various parameter settings are calculated, and the ionization chamber parameters that meet the conditions are obtained by screening the calculated alpha particle drift trajectory and current induction data.

[0013] In one implementation, the current sensing data is instantaneous induced current data on the electrode caused by moving charged particles near the electrode.

[0014] In one implementation, the optimizing the ionization chamber according to the ionization chamber parameters that meet the conditions, and monitoring and outputting particle drift and current sensing results based on the optimized ionization chamber, includes: Adjusting the corresponding ionization chamber data according to the ionization chamber parameters that meet the conditions to obtain the optimized ionization chamber; Based on the optimized ionization chamber, the finite element analysis software is used to calculate the electron drift offset data of the parallel plate electric field in the ionization chamber; The particle drift and current sensing results are calculated and outputted according to the electron drift offset data of the parallel plate electric field.

[0015] In a second aspect, the present invention provides an ionization chamber internal electric field modeling and radioactive interference suppression device, comprising: An ionization chamber modeling module is used to obtain a geometric model of the ionization chamber using a multi-physics simulation software package; An ionization chamber parameter acquisition module is used to analyze the electric field distribution inside the ionization chamber by using finite element analysis software, and to simulate the drift trajectory and drift end point of the secondary electrons under various parameter settings by using a particle physics experiment simulation program, so as to obtain ionization chamber parameters that meet the conditions; The ionization chamber optimization and monitoring module is used to optimize the ionization chamber according to the ionization chamber parameters that meet the conditions, and monitor and output particle drift and current sensing results based on the optimized ionization chamber.

[0016] In a third aspect, the present invention provides a terminal, comprising: a processor and a memory, wherein the memory stores a program for modeling the electric field inside an ionization gas chamber and suppressing radioactive interference, and when the program for modeling the electric field inside an ionization gas chamber and suppressing radioactive interference is executed by the processor, it is used to implement the operation of the method for modeling the electric field inside an ionization gas chamber and suppressing radioactive interference as described in the first aspect.

[0017] In a fourth aspect, the present invention further provides a medium, which is a computer-readable storage medium, and which stores a program for modeling the internal electric field of an ionized gas chamber and suppressing radioactive interference. When the program for modeling the internal electric field of an ionized gas chamber and suppressing radioactive interference is executed by a processor, it is used to implement the operation of the method for modeling the internal electric field of an ionized gas chamber and suppressing radioactive interference as described in the first aspect.

[0018] The present invention adopts the above technical solution to achieve the following effects: The present invention analyzes the electric field distribution inside the ionization chamber by using finite element analysis software, and uses a particle physics experimental simulation program to simulate the drift trajectory and drift end point of the secondary electrons under multiple parameter settings to obtain the optimal parameters, and then optimizes the ionization chamber according to the obtained optimal parameters, and uses the optimized ionization chamber to monitor and output particle drift and current sensing results. The present invention shields the radiation interference caused by the detector itself on the basis of the original function of the traditional ionization chamber, reduces the background emission rate of the alpha particle measurement device, and improves the detection efficiency and accuracy of low-level radioactivity measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a flow chart of the method for modeling the electric field inside the ionization chamber and suppressing radioactive interference in the present invention.

[0021] Figure 2 It is a schematic diagram of the sample position in the ionization gas chamber of one implementation method of the present invention.

[0022] Figure 3 It is a schematic diagram of simulating alpha particle drift and current induction in an anode according to one implementation of the present invention.

[0023] Figure 4 It is a schematic diagram of the electric field generated by adding a copper sample in one implementation of the present invention.

[0024] Figure 5 It is a schematic diagram of calculation results of an ionization gas chamber in one implementation of the present invention.

[0025] Figure 6 It is a schematic diagram of an ionization chamber in one implementation of the present invention.

[0026] Figure 7 It is a functional principle diagram of a terminal in one implementation of the present invention.

[0027] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Exemplary Methods The background emission rate of conventional α-particle measurement devices is The level of ultra-low alpha particles cannot meet the measurement requirements of such low background samples. Therefore, it is necessary to study and break through ultra-low alpha particle electronic materials and detection technologies to solve the fundamental problem. Although relevant ionization gas chamber research has been carried out for ultra-low alpha surface emissivity measurement, a mature measurement system has not been formed, and there are currently no directly applicable measurement equipment and related technical standards. Although there are measuring instruments with the same purpose, the measurement capabilities still cannot fully cover the needs and cannot shield the radiation interference caused by the detector itself.

[0030] In view of the above technical problems, an embodiment of the present invention provides an ionization chamber internal electric field modeling and radioactive interference suppression method, which analyzes the electric field distribution inside the ionization chamber by finite element analysis software, and uses a particle physics experiment simulation program to simulate the drift trajectory and drift end point of the secondary electrons under multiple parameter settings to obtain the optimal parameters, and then optimizes the ionization chamber according to the obtained optimal parameters, and uses the optimized ionization chamber to monitor and output particle drift and current sensing results. The embodiment of the present invention shields the radiation interference caused by the detector itself on the basis of the original function of the traditional ionization chamber, reduces the background emission rate of the alpha particle measurement device, and improves the detection efficiency and accuracy of low-level radioactivity measurement.

[0031] like Figure 1 As shown, an embodiment of the present invention provides a method for modeling the electric field inside an ionization chamber and suppressing radioactive interference, comprising the following steps: Step S100, using a multi-physics simulation software package to model and obtain a geometric model of the ionization chamber.

[0032] In this embodiment, the ionization chamber is simulated by modeling, and the internal electric field is further simulated in the simulated ionization chamber, so that the modeled ionization chamber and electric field are used for analysis, and the ionization chamber is optimized using the obtained optimal parameters, so as to shield the radiation interference caused by the detector itself on the basis of the original function of the traditional ionization chamber.

[0033] Specifically, in an implementation of this embodiment, step S100 includes the following steps: Step S101, using the multi-physics simulation software package to model the ionization chamber, and simulating the parallel plate electric field in the ionization chamber to obtain a geometric model of the ionization chamber.

[0034] In this embodiment, when modeling the ionization chamber, a multi-physics simulation software package COMSOL (a general simulation software applicable to various engineering, manufacturing and scientific research fields) can be used to model the geometric model of the ionization chamber and model the electric field used in the simulation. In this embodiment, the geometric model of the ionization chamber is first established in COMSOL, and then a parallel plate electric field is modeled inside the ionization chamber, so as to use this parallel plate electric field to simulate the influence on electron drift.

[0035] In this embodiment, in addition to simulating the ionization gas chamber and the parallel plate electric field, COMSOL is also used to calculate and simulate the gravity field required by the nine Shockley-Ramo theorems (the Shockley-Ramo theorem provides a convenient way to simulate the induced current caused by the movement of charge carriers on the electrodes of the radiation detector. The key to this theorem is the introduction of the concept of weighted potential or weighted field when calculating the induced current), which places the anode and the protective layer in different configurations.

[0036] Specifically, in an implementation of this embodiment, the simulating the parallel plate electric field in the ionization chamber includes: performing electric field simulation based on a sample with field distortion and a sample without field distortion respectively to obtain a corresponding parallel plate electric field.

[0037] In this embodiment, when the geometric model of the ionization chamber is established in COMSOL, as shown in FIG. Figure 6 As shown, the model of the ionization chamber includes six different components: ground electrode, copper sample, guard electrode, anode, field shaper and integrator circuit module.

[0038] Specifically, the bottom of the ionization chamber consists of a grounded electrode on which the copper sample (i.e., specimen) is placed for investigation. The top of the ionization chamber has two configurable positive voltage electrodes (i.e., guard electrode and anode). These two positive voltage electrodes can be configured in two different configurations: Figure 2 As shown, one configuration is 707cm 2 The circular counting area of ​​1560cm 2 The square counting area (i.e. the square counting area outside the circle)

[0039] In addition, the ionization chamber includes a field shaper on the side to ensure that the electric field lines inside the ionization chamber are parallel throughout the entire volume; after the electric field excites free electrons inside the ionization chamber, the induced charges are processed by a proprietary integration circuit to analyze the electric field distribution inside the ionization chamber by finite element analysis software.

[0040] like Figure 1 As shown, an embodiment of the present invention provides a method for modeling the electric field inside an ionization chamber and suppressing radioactive interference, comprising the following steps: Step S200, analyzing the electric field distribution inside the ionization chamber by finite element analysis software, and using a particle physics experiment simulation program to simulate the drift trajectory and drift end point of the secondary electrons under various parameter settings to obtain ionization chamber parameters that meet the conditions.

[0041] In this embodiment, after the ionization gas chamber and the parallel plate electric field are obtained by modeling using the multi-physics simulation software package COMSOL, 7 230 The Th samples and copper samples were placed on the ground electrode. 230 Th samples were placed as Figure 2 As shown, position 1 is a circular 707 cm 2 The center of the electrode counting area. Position 2 and Position 4 are located at the copper sample (circular 707 cm 2 The inner and outer edges of the square at the center of the electrode counting area. Positions 3 and 5 are located on the inner and outer sides of the corner of the copper sample, respectively. Positions 3 and 5 both have the highest field distortion expectations; Positions 6 and 7 are located at the circular 707 cm 2 Inner edge of the electrode counting area.

[0042] In this embodiment, based on 7 230 Th samples and copper samples, the experiment was modeled and simulated under ideal conditions to investigate the feasibility of using pulse shapes to distinguish events originating from the tray from those originating from the copper sample and to validate the results of the 2015 experiment. The software described in the Finite Element Analysis Software section was used to simulate alpha particle drift and current induction in the anode. Current induction requires the implementation of the Shockley-Ramo theorem, allowing the calculation of the instantaneous induced current on the electrode due to moving charged particles near the electrode.

[0043] In this example, in addition to these weighted fields, the static parallel plate electric field between the tray and the anode is also modeled in COMSOL. Figure 3 As shown, Figure 3 The electric field lines shown in the figure show the lines along which the electrons drift. The electric field generated by adding the copper sample is as follows Figure 4 shown.

[0044] In this embodiment, for 7230 Th samples and copper samples, the electric field lines inside the ionization gas chamber are controlled by a field shaper to be parallel throughout the volume. When charged particles pass through the electric field, they ionize the argon gas, leaving behind ionized tracks of argon ions and electrons. These free electrons drift through the electric field, inducing a time-varying charge on the anode. This induced charge is then processed by a proprietary integrator circuit, which is the output or pulse shape of each detected particle.

[0045] In this embodiment, after the output or pulse shape of the particle is detected by the integration circuit, the electric field distribution inside the ionization chamber is analyzed by finite element analysis software, and the drift trajectory and drift end point of the secondary electrons are simulated by the Garfield program (i.e., particle physics experiment simulation program) under multiple parameter settings to obtain the optimal parameters and optimize the ionization chamber. On the basis of the original function of the traditional ionization chamber, the radiation interference caused by the detector itself is shielded, the background is reduced, and the detection efficiency of low-level radioactivity measurement is improved.

[0046] Specifically, in an implementation of this embodiment, step S200 includes the following steps: Step S201, outputting the simulated parallel plate electric field as a group of grid points into a text file, and interpolating the grid points through the finite element analysis software to make the electrons in the argon gas drift; Step S202: analyzing the electric field distribution inside the ionization chamber by using the finite element analysis software.

[0047] In this embodiment, Garfield++ (Garfield program) is an object-oriented toolkit for detailed simulation of particle detectors based on gas or semiconductor ionization measurements. In order to calculate the electric field, there are mainly the following calculation methods: 1) Solutions for thin-line limits for wires and planar devices; 2) Interfaces to finite element programs that can compute approximate fields for almost arbitrary two- and three-dimensional configurations with dielectrics and conductors; 3) Interface with Synopsys Sentaurus (‌Synopsys Sentaurus‌ is a set of TCAD (Technology Computer-Aided Design) tool suites for simulating the manufacturing, operation, and reliability of semiconductor devices) device simulation programs; 4) Interface with neBEM field solver (i.e., Boundary Element Method (BEM) solver is a numerical analysis method used to solve physical problems, especially in the field of electromagnetic field analysis and engineering simulation).

[0048] In this embodiment, the output or pulse shape of the particle is detected by an integrating circuit, and the electric field is calculated through the interface of the finite element program.

[0049] In this embodiment, in order to calculate the transport properties of electrons in the mixed gas, the interface of the Magboltz program (the ‌Magboltz program‌ is an electron group simulation software that focuses on directly solving the steady-state Boltzmann transport equation) can be used. The ionization pattern generated along the trajectory of relativistic charged particles can be simulated using the "HEED" program (the ‌HEED program‌ is a simulation program based on MATLAB, which is specifically used to study and analyze power control strategies in wireless sensor networks). In order to simulate the ionization information generated by low-energy ions, the results calculated using SRIM (Simultion of Rdition InducedMterilsEffects, radiation-induced material effects simulation) or the Geant4 software package (a Monte Carlo application software package developed based on C++ object-oriented technology, used to simulate the physical process of particle transport in matter) can be imported.

[0050] In this example, COMSOL was used to calculate and simulate the gravity field required for nine Shockley-Ramo theorems, which place the anode and the protective layer in different configurations, such as Figure 2 The electric fields were modeled both with and without field distorted samples. The fields were then output to a text file as a set of grid points which were then interpolated by Garfield++ for the drift of electrons in the argon gas.

[0051] In this embodiment, after the electrons in the argon gas are drifted, the electric field distribution inside the ionization chamber is analyzed by finite element analysis software, and a particle physics experiment simulation program is used to simulate the drift trajectory and drift end point of the secondary electrons under various parameter settings, and the optimal ionization chamber parameters can be selected from the various parameter settings.

[0052] Specifically, in an implementation of this embodiment, step S200 further includes the following steps: Step S201, using the particle physics experiment simulation program to simulate alpha particle drift and current induction in the anode under various parameter settings; Step S202, calculating the drift trajectory of alpha particles and current sensing data in the anode under various parameter settings, and screening the calculated drift trajectory of alpha particles and current sensing data to obtain the ionization chamber parameters that meet the conditions.

[0053] In this embodiment, the Garfield++ program is used to simulate the alpha particle drift and current induction in the anode under various parameter settings. The current induction requires the implementation of the Shockley-Ramo theorem, allowing the calculation of the instantaneous induced current on the electrode caused by the mobile charged particles near the electrode. Therefore, the current sensing data is the instantaneous induced current data on the electrode caused by the mobile charged particles near the electrode.

[0054] After calculating the alpha particle drift trajectory and current induction data in the anode under various parameter settings based on the Shockley-Ramo theorem, the ionization chamber parameter configuration with the minimum radioactive interference (i.e., the minimum background emissivity of the alpha particle measurement device) is screened from the calculated alpha particle drift trajectory and current induction data, and the optimal ionization chamber parameters that meet the conditions can be obtained, and the ionization chamber can be optimized using this optimal parameter.

[0055] like Figure 1 As shown, an embodiment of the present invention provides a method for modeling the electric field inside an ionization chamber and suppressing radioactive interference, comprising the following steps: Step S300, optimizing the ionization chamber according to the ionization chamber parameters that meet the conditions, and monitoring and outputting particle drift and current sensing results based on the optimized ionization chamber.

[0056] In this embodiment, after the optimal ionization chamber parameters that meet the conditions are calculated, the optimal parameters are used to optimize the ionization chamber, that is, the parameter settings of the ionization chamber are adjusted; then, based on the optimized ionization chamber, the particle drift and current sensing results are monitored and output, thereby realizing a particle monitoring process with low radioactive interference.

[0057] Specifically, in an implementation of this embodiment, step S300 includes the following steps: Step S301, adjusting the corresponding ionization chamber data according to the ionization chamber parameters that meet the conditions to obtain the optimized ionization chamber; Step S302, based on the optimized ionization chamber, using the finite element analysis software to calculate the electron drift offset data of the parallel plate electric field in the ionization chamber; Step S303, calculating and outputting the particle drift and current sensing results according to the electron drift offset data of the parallel plate electric field.

[0058] In this embodiment, the calculation results of the ionization chamber are as follows: Figure 5 As shown, according to the calculation results, determine Figure 5 The closest sample to the copper sample (i.e. Figure 5The trajectory of the secondary electrons (the square area shown in ) can be obtained by selecting the parameter setting corresponding to the trajectory. The optimal ionization chamber parameters can be obtained by optimizing the ionization chamber according to the optimal ionization chamber parameters. The drift trajectory of the secondary electrons and the drift endpoint monitoring method can be realized under low radioactive interference based on the optimized ionization chamber monitoring and output particle drift and current sensing results.

[0059] Based on the optimized ionization chamber, the finite element analysis software is similarly used to calculate the electron drift offset data of the parallel plate electric field in the ionization chamber, and the particle drift and current induction results are calculated and output according to the parallel plate electric field electron drift offset data.

[0060] This embodiment achieves the following technical effects through the above technical solution: This embodiment uses finite element analysis software to analyze the electric field distribution inside the ionization chamber, uses a particle physics experiment simulation program to simulate the drift trajectory and drift end point of the secondary electrons under multiple parameter settings, obtains the optimal parameters, and then optimizes the ionization chamber according to the obtained optimal parameters, and uses the optimized ionization chamber to monitor and output particle drift and current sensing results. This embodiment shields the radiation interference caused by the detector itself on the basis of the original function of the traditional ionization chamber, reduces the background emission rate of the alpha particle measurement device, and improves the detection efficiency and accuracy of low-level radioactivity measurement.

[0061] Exemplary Devices Based on the above embodiments, the present invention further provides an ionization chamber internal electric field modeling and radioactive interference suppression device, comprising: An ionization chamber modeling module is used to obtain a geometric model of the ionization chamber using a multi-physics simulation software package; An ionization chamber parameter acquisition module is used to analyze the electric field distribution inside the ionization chamber by using finite element analysis software, and to simulate the drift trajectory and drift end point of the secondary electrons under various parameter settings by using a particle physics experiment simulation program, so as to obtain ionization chamber parameters that meet the conditions; The ionization chamber optimization and monitoring module is used to optimize the ionization chamber according to the ionization chamber parameters that meet the conditions, and monitor and output particle drift and current sensing results based on the optimized ionization chamber.

[0062] This embodiment achieves the following technical effects through the above technical solution: This embodiment uses finite element analysis software to analyze the electric field distribution inside the ionization chamber, uses a particle physics experiment simulation program to simulate the drift trajectory and drift end point of the secondary electrons under multiple parameter settings, obtains the optimal parameters, and then optimizes the ionization chamber according to the obtained optimal parameters, and uses the optimized ionization chamber to monitor and output particle drift and current sensing results. This embodiment shields the radiation interference caused by the detector itself on the basis of the original function of the traditional ionization chamber, reduces the background emission rate of the alpha particle measurement device, and improves the detection efficiency and accuracy of low-level radioactivity measurement.

[0063] Based on the above embodiment, the present invention further provides a terminal, whose principle block diagram can be as follows: Figure 7 shown.

[0064] The terminal includes: a processor, a memory, an interface, a display screen and a communication module connected through a system bus; wherein the processor of the terminal is used to provide computing and control capabilities; the memory of the terminal includes a storage medium and an internal memory; the storage medium stores an operating system and a computer program; the internal memory provides an environment for the operation of the operating system and the computer program in the storage medium; the interface is used to connect to external devices; the display screen is used to display corresponding information; and the communication module is used to communicate with a cloud server or other devices.

[0065] When the computer program is executed by a processor, it is used to implement the operation of the electric field modeling and radioactive interference suppression method inside the ionization gas chamber.

[0066] It can be understood by those skilled in the art that Figure 7 The principle block diagram shown in the figure is only a block diagram of a partial structure related to the scheme of the present invention, and does not constitute a limitation on the terminal to which the scheme of the present invention is applied. The specific terminal may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0067] In one embodiment, a terminal is provided, which includes: a processor and a memory, the memory storing an ionization gas chamber internal electric field modeling and radioactive interference suppression program, and the ionization gas chamber internal electric field modeling and radioactive interference suppression program is used to implement the above-mentioned ionization gas chamber internal electric field modeling and radioactive interference suppression method when executed by the processor.

[0068] In one embodiment, a storage medium is provided, wherein the storage medium stores a program for modeling the electric field inside an ionization gas chamber and suppressing radioactive interference, and when the program for modeling the electric field inside an ionization gas chamber and suppressing radioactive interference is executed by a processor, it is used to implement the operations of the above-mentioned method for modeling the electric field inside an ionization gas chamber and suppressing radioactive interference.

[0069] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include non-volatile and volatile memory.

[0070] In summary, the present invention provides a method for modeling the electric field inside an ionization chamber and suppressing radioactive interference, including: using a multi-physics simulation software package to model a geometric model of the ionization chamber; analyzing the electric field distribution inside the ionization chamber by finite element analysis software, and using a particle physics experiment simulation program to simulate the drift trajectory and drift end point of the secondary electrons under multiple parameter settings to obtain ionization chamber parameters that meet the conditions; optimizing the ionization chamber according to the ionization chamber parameters that meet the conditions, and monitoring and outputting particle drift and current sensing results based on the optimized ionization chamber. The present invention can shield the radiation interference caused by the detector itself on the basis of the original function of the traditional ionization chamber, reduce the background emission rate of the alpha particle measurement device, and thus improve the detection efficiency and accuracy of low-level radioactivity measurement.

[0071] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for modeling the electric field inside an ionization chamber and suppressing radioactive interference, characterized in that: include: The geometric model of the ionization chamber is obtained by modeling using a multi-physics simulation software package; The electric field distribution inside the ionization chamber is analyzed by finite element analysis software, and the drift trajectory and drift end point of the secondary electrons are simulated by a particle physics experiment simulation program under various parameter settings to obtain ionization chamber parameters that meet the conditions; The ionization chamber is optimized according to the ionization chamber parameters that meet the conditions, and the particle drift and current sensing results are monitored and output based on the optimized ionization chamber.

2. The method for modeling the electric field inside the ionization chamber and suppressing radioactive interference according to claim 1, characterized in that: The geometric model of the ionization chamber is obtained by modeling using a multi-physics simulation software package, including: The multi-physics simulation software package is used to model the ionization chamber, and the parallel plate electric field in the ionization chamber is simulated to obtain a geometric model of the ionization chamber.

3. The method for modeling the electric field inside the ionization chamber and suppressing radioactive interference according to claim 2, characterized in that: The simulating of the parallel plate electric field in the ionization chamber comprises: Electric field simulations were performed based on samples with field distortion and samples without field distortion, respectively, and the corresponding parallel plate electric fields were obtained.

4. The method for modeling the electric field inside the ionization chamber and suppressing radioactive interference according to claim 1, characterized in that: The analyzing the electric field distribution inside the ionization chamber by finite element analysis software includes: Outputting the simulated parallel plate electric field as a set of grid points into a text file, and interpolating the grid points using the finite element analysis software to drift the electrons in the argon gas; The electric field distribution inside the ionization chamber is analyzed by the finite element analysis software.

5. The method for modeling the electric field inside the ionization chamber and suppressing radioactive interference according to claim 4, characterized in that: The particle physics experiment simulation program is used to simulate the drift trajectory and drift end point of the secondary electrons under the setting of multiple parameters, including: The particle physics experiment simulation program is used to simulate alpha particle drift and current induction in the anode under various parameter settings; The alpha particle drift trajectory and current induction data in the anode under various parameter settings are calculated, and the ionization chamber parameters that meet the conditions are obtained by screening the calculated alpha particle drift trajectory and current induction data.

6. The method for modeling the electric field inside the ionization chamber and suppressing radioactive interference according to claim 5, characterized in that: The current sensing data is instantaneous induced current data on the electrode caused by moving charged particles near the electrode.

7. The method for modeling the electric field inside the ionization chamber and suppressing radioactive interference according to claim 1, characterized in that: The step of optimizing the ionization chamber according to the ionization chamber parameters that meet the conditions, and monitoring and outputting particle drift and current sensing results based on the optimized ionization chamber includes: Adjusting the corresponding ionization chamber data according to the ionization chamber parameters that meet the conditions to obtain the optimized ionization chamber; Based on the optimized ionization chamber, the finite element analysis software is used to calculate the electron drift offset data of the parallel plate electric field in the ionization chamber; The particle drift and current sensing results are calculated and outputted according to the electron drift offset data of the parallel plate electric field.

8. An ionization chamber internal electric field modeling and radioactive interference suppression device, characterized in that: include: An ionization chamber modeling module is used to obtain a geometric model of the ionization chamber using a multi-physics simulation software package; An ionization chamber parameter acquisition module is used to analyze the electric field distribution inside the ionization chamber by using finite element analysis software, and to simulate the drift trajectory and drift end point of the secondary electrons under various parameter settings by using a particle physics experiment simulation program, so as to obtain ionization chamber parameters that meet the conditions; The ionization chamber optimization and monitoring module is used to optimize the ionization chamber according to the ionization chamber parameters that meet the conditions, and monitor and output particle drift and current sensing results based on the optimized ionization chamber.

9. A terminal, characterized in that: include: A processor and a memory, wherein the memory stores a program for modeling the electric field inside an ionization gas chamber and suppressing radioactive interference, and when the program is executed by the processor, it is used to implement the operation of the method for modeling the electric field inside an ionization gas chamber and suppressing radioactive interference as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program for modeling the internal electric field of an ionized gas chamber and suppressing radioactive interference. When the program is executed by a processor, it is used to implement the operation of the method for modeling the internal electric field of an ionized gas chamber and suppressing radioactive interference as described in any one of claims 1 to 7.

Images