Method for determining the width value of an avalanche air gap of a gas detector and related device

Abstract

The application discloses a method for determining the width value of an avalanche gas gap of a gas detector and a related device, and belongs to the technical field of detectors. The method comprises the following steps: sequentially obtaining a plurality of energy spectrum groups of an anode readout plate irradiated by a radioactive source under a plurality of different voltages; obtaining a primary electron number; for each energy spectrum group corresponding to a voltage: obtaining a detector gain corresponding to the voltage based on the energy spectrum group and the primary electron number; determining a gas parameter and a photon feedback item corresponding to the voltage; determining the width value of the avalanche gas gap under the voltage based on the detector gain corresponding to the voltage, the gas parameter corresponding to the voltage, and the photon feedback item corresponding to the voltage; and determining the final width value of the avalanche gas gap of the gas detector based on the width values of the avalanche gas gaps under the plurality of different voltages. The application can improve the accuracy of the determined width value of the avalanche gas gap, thereby accurately calibrating the avalanche gas gap of the gas detector.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detectors, in particular to a method for determining the width value of an avalanche gap of a gas detector and related apparatus. BACKGROUND

[0002] MTPC (Multi-purpose Time Projection Chamber) is a new type of TPC (Time Projection Chamber) device, which can be used for nuclear data measurement and gas detector research. The MTPC detector system usually uses a Micromegas gas detector (Micro Mesh Gas Chamber) to amplify the drift electrons by avalanche, and the gain factor and energy resolution of the Micromegas gas detector are crucial for particle energy reconstruction and track reconstruction. In order to ensure the measurement accuracy of the MTPC detector system, it is necessary to accurately calibrate the avalanche gap of the Micromegas gas detector, that is, to determine the accurate width value of the avalanche gap. SUMMARY

[0003] The embodiments of the present application provide a method for determining the width value of an avalanche gap of a gas detector and related apparatus, which can improve the accuracy of the determined width value of the avalanche gap, thereby accurately calibrating the avalanche gap of the gas detector. The technical solution is as follows:

[0004] In one aspect, a method for determining the width value of an avalanche gap of a gas detector is provided, the gas detector comprising an anode readout plate; the method comprising:

[0005] sequentially obtaining a plurality of energy spectrum group sets of the anode readout plate irradiated by a radioactive source under a plurality of different voltages, each different voltage corresponding to an energy spectrum group set, and each energy spectrum group set comprising a plurality of energy spectra;

[0006] obtaining a primary electron number, which is determined in advance according to the radioactive source and the gas environment;

[0007] for each energy spectrum group corresponding to a voltage: based on the energy spectrum group and the primary electron number, obtaining a detector gain corresponding to the voltage; determining a gas parameter and a photon feedback term corresponding to the voltage; and based on the detector gain corresponding to the voltage, the gas parameter corresponding to the voltage, and the photon feedback term corresponding to the voltage, determining the width value of the avalanche gap under the voltage;

[0008] based on the width values of the avalanche gap under the plurality of different voltages, determining the final width value of the avalanche gap of the gas detector.

[0009] Optionally, the determining the width value of the avalanche gas gap of the gas detector based on the width values of the avalanche gas gaps under the plurality of different voltages comprises:

[0010] fitting the width values of the avalanche gas gaps under the plurality of different voltages to obtain the width value of the avalanche gas gap of the gas detector.

[0011] Optionally, the obtaining the detector gain corresponding to the voltage based on the set of energy spectra and the primary electron number comprises:

[0012] for each energy spectrum in the set of energy spectra: determining the electron number corresponding to the energy spectrum; dividing the electron number corresponding to the energy spectrum by the primary electron number to obtain an initial gain corresponding to the energy spectrum;

[0013] fitting the initial gains corresponding to the energy spectra in the set of energy spectra to obtain the detector gain corresponding to the voltage.

[0014] Optionally, the anode readout plate has a plurality of sub-zones, and the sequentially obtaining a plurality of sets of energy spectra of the anode readout plate irradiated by the radioactive source under a plurality of different voltages comprises:

[0015] for the anode readout plate under each voltage: obtaining an energy spectrum corresponding to each sub-zone in the plurality of sub-zones to obtain a set of energy spectra under the voltage.

[0016] In another aspect, a device for determining a width value of an avalanche gas gap of a gas detector is provided, the gas detector comprising an anode readout plate; the device comprising:

[0017] a first obtaining module configured to sequentially obtain a plurality of sets of energy spectra of the anode readout plate irradiated by the radioactive source under a plurality of different voltages, each different voltage corresponding to a set of energy spectra, each set of energy spectra comprising a plurality of energy spectra;

[0018] a second obtaining module configured to obtain a primary electron number, the primary electron number being determined in advance according to the radioactive source and a gas environment;

[0019] a first determining module configured to, for each set of energy spectra corresponding to a voltage: obtain a detector gain corresponding to the voltage based on the set of energy spectra and the primary electron number; determine a gas parameter corresponding to the voltage and a photon feedback term corresponding to the voltage; and determine a width value of an avalanche gas gap under the voltage based on the detector gain corresponding to the voltage, the gas parameter corresponding to the voltage, and the photon feedback term corresponding to the voltage.

[0020] a second determining module configured to determine a width value of an avalanche gas gap of the gas detector based on the width values of the avalanche gas gaps under the plurality of different voltages.

[0021] Optionally, the second determining module is specifically configured to:

[0022] fitting the width values of the avalanche gas gaps under the plurality of different voltages to obtain a final width value of the avalanche gas gap of the gas detector.

[0023] Optionally, the first determining module comprises:

[0024] a determining sub-module, configured to, for each energy spectrum diagram in the group of energy spectrum diagrams: determine the number of electrons corresponding to the energy spectrum diagram; and divide the number of electrons corresponding to the energy spectrum diagram by the primary number of electrons to obtain an initial gain corresponding to the energy spectrum diagram.

[0025] a fitting sub-module, configured to fit the initial gain corresponding to each energy spectrum diagram in the group of energy spectrum diagrams to obtain a detector gain corresponding to the voltage.

[0026] Optionally, the anode readout plate has a plurality of partitions, and the first obtaining module comprises:

[0027] an obtaining sub-module, configured to, for the anode readout plate under each voltage: obtain an energy spectrum diagram corresponding to each partition in the plurality of partitions to obtain a group of energy spectrum diagrams under the voltage.

[0028] In another aspect, a computer readable storage medium is provided, and the storage medium stores a computer program, and the computer program can be executed by a processor to implement the steps of the method for determining the width value of the avalanche gas gap of the gas detector.

[0029] In another aspect, a computer program product containing instructions is provided, and when the instructions are run on a computer, the computer is caused to perform the steps of the method for determining the width value of the avalanche gas gap of the gas detector.

[0030] The technical scheme provided in the application can at least bring the following beneficial effects:

[0031] By directly obtaining the spectrum group of the anode readout plate irradiated by the radioactive source, the influence of the charge diffusion on the resistive layer on the calculation of the detector gain corresponding to each voltage can be avoided, so as to improve the accuracy of the width value of the avalanche gas gap of the gas detector finally determined; moreover, combined with the photon feedback term, the influence of the photon feedback on the scaling of the avalanche gas gap can be reduced, and the accuracy of the width value of the avalanche gas gap determined is further improved, so as to improve the accuracy of the gain scaling; in addition, the detector gain corresponding to multiple different voltages is calculated, and then the width value of the avalanche gas gap under multiple voltages is obtained, and the multiple width values are fitted to determine the final width value of the avalanche gas gap of the gas detector, which can not only improve the accuracy of the width value of the avalanche gas gap determined, but also ensure the measurement accuracy of the gas detector under different voltages. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A flowchart of a method for determining a width value of an avalanche gas gap of a gas detector according to an embodiment of the present application is shown in FIG. 1.

[0033] Figure 2 A structural schematic diagram of a device for determining a width value of an avalanche gas gap of a gas detector according to an embodiment of the present application is shown in FIG. 2. DETAILED DESCRIPTION

[0034] The present application will be further described in detail by specific embodiments in conjunction with the drawings. In different embodiments, similar elements are associated with similar element reference numbers. In the following embodiments, many details are described in order to make the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different cases, or can be replaced by other elements, materials or methods. In some cases, some operations related to the present application are not shown or described in the specification in order to avoid the core part of the present application being overwhelmed by too much description, and it is not necessary to describe these related operations in detail for those skilled in the art according to the description in the specification and the general technical knowledge in the art.

[0035] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be sequentially adjusted or adjusted in a manner that is obvious to those skilled in the art. Therefore, the order in the specification and the drawings is only for the purpose of clearly describing a certain embodiment, and does not mean that it is the necessary order, unless otherwise stated that a certain order must be followed.

[0036] The serial numbers of components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and have no technical meaning. Unless otherwise specified, "connection" and "coupling" in this application include direct and indirect connections (couplings).

[0037] Before the method for determining the width value of the avalanche gap of the gas detector provided by the embodiments of the present application is explained in detail, the application scenarios and implementation environments involved in the embodiments of the present application are introduced.

[0038] MTPC is a new type of TPC device, which can be used for nuclear data measurement and gas detector research, and MTPC usually uses Micromegas gas detector to avalanche amplify the drift electrons. Micromegas gas detector is a parallel plate avalanche detector, whose structure is to insert a grid structure between the negative plate and the anode, so as to divide the internal space of the detector into two parts, namely the conversion zone and the avalanche amplification zone. Among them, the conversion zone is the region where the incident particles produce ionization, and the avalanche amplification zone (i.e. avalanche gap) is the region where the ionization electrons undergo avalanche amplification. Since the gain factor and energy resolution of the Micromegas gas detector are crucial for particle energy reconstruction and track reconstruction, in order to ensure the measurement accuracy of the MTPC detector system, it is necessary to accurately calibrate the avalanche gap of the Micromegas gas detector, that is, to determine the width value of the accurate avalanche gap.

[0039] Based on this, the embodiments of the present application provide a method for determining the width value of the avalanche gap of the gas detector, which can avoid the influence of the charge diffusion on the resistive layer on the calculation of the detector gain corresponding to each voltage, so as to improve the accuracy of the width value of the avalanche gap of the gas detector finally determined; and combined with the photon feedback term, the influence of the photon feedback on the calibration of the avalanche gap can be reduced, further improving the accuracy of the determined width value of the avalanche gap, thereby improving the accuracy of the gain calibration.

[0040] The execution subject of the method for determining the width value of the avalanche gap of the gas detector provided by the embodiments of the present application can be a computer device or a gas detector with an avalanche gap.

[0041] In the case that the execution subject is a computer device, the computer device can determine the width value of the avalanche gap of the gas detector and apply the width value to the corresponding gas detector. The computer device can be a PC (Personal Computer), a mobile phone, a smart phone, a PDA (Personal Digital Assistant), a wearable device, a PPC (Pocket PC), a tablet computer, a smart television, etc.

[0042] In the case that the execution subject is a gas detector with an avalanche gap, the gas detector can directly determine the width value of the avalanche gap of itself and apply the width value to the structure of itself. The gas detector can be a Micromegas gas detector or other gas detectors.

[0043] Those skilled in the art should understand that the computer device and the gas detector with an avalanche gap described above are only examples, and other existing or future computer devices and gas detectors, such as those applicable to the embodiments of the present application, should also be included in the protection scope of the embodiments of the present application and are hereby incorporated by reference.

[0044] It should be noted that the application scenarios and implementation environments described in the embodiments of the present application are for more clearly explaining the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, as new application scenarios appear and implementation environments evolve, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0045] Next, the method for determining the avalanche gap value of the gas detector provided by the embodiments of the present application will be explained in detail.

[0046] Please refer to Figure 1 , Figure 1 is a flowchart of a method for determining the avalanche gap value of a gas detector provided by the embodiments of the present application. The method includes the following steps.

[0047] Step 101: Obtain a plurality of energy spectrum group sets of the anode readout plate irradiated by a radioactive source under a plurality of different voltages in sequence, each different voltage corresponding to an energy spectrum group set, and each energy spectrum group set including a plurality of energy spectrum groups.

[0048] The anode readout plate is an electronic component for a detector, which mainly functions to collect and process electrical signals from the anode. Moreover, the anode readout plate can be used to detect the electric charges generated when particles pass through and convert these electric charges into measurable electrical signals. Thus, the energy spectrum group of the anode readout plate irradiated by a radioactive source can be directly obtained.

[0049] In some embodiments, the anode readout plate has a plurality of sub-zones, and for each voltage of the anode readout plate: a spectrum corresponding to each sub-zone of the plurality of sub-zones is obtained to obtain a set of spectra corresponding to the voltage.

[0050] That is, since the anode readout plate can be divided into a plurality of sub-zones, and due to external factors, the spectra corresponding to the plurality of sub-zones can be different when the plurality of sub-zones are irradiated by the radiation source at the same voltage, that is, at the same voltage, a plurality of different spectra can be obtained. Thus, at the same voltage, a set of spectra corresponding to the voltage can be obtained by obtaining the spectrum corresponding to each sub-zone of the plurality of sub-zones.

[0051] In order to improve the accuracy of the determined width value of the avalanche air gap, the voltage of the anode plate readout plate can also be changed, so that a set of spectra corresponding to the anode readout plate at a plurality of different voltages can be obtained in turn, so that a more accurate width value of the avalanche air gap can be determined based on the plurality of sets of spectra in the subsequent process.

[0052] For example, it is assumed that the voltage range of the anode readout plate is 550V to 610V. Thus, a plurality of spectra corresponding to the plurality of sub-zones of the anode readout plate when the anode readout plate is irradiated by the radiation source at a voltage of 550V can be obtained, so as to obtain a set of spectra corresponding to the anode readout plate at a voltage of 550V. Similarly, a set of spectra corresponding to the anode readout plate at a voltage of 560V, 570V, 580V, 590V, 600V and 610V can be obtained.

[0053] It should be noted that the voltage range of the anode readout plate described above is only an example, and in application, the voltage range of the anode readout plate can be determined according to actual needs, and the embodiments of the present application do not limit this.

[0054] In some embodiments, the voltage of the anode readout plate can be manually changed by a technician to obtain a plurality of sets of spectra corresponding to different voltages, or a plurality of voltage values of the anode readout plate can be pre-set by a technician, and the voltage of the anode readout plate can be automatically changed by a computer device or a gas detector after obtaining a set of spectra corresponding to the corresponding voltage, so as to obtain a plurality of sets of spectra corresponding to different voltages.

[0055] In addition, in some embodiments, different avalanche gap width values can be obtained due to different radioactive sources, and thus, the technician needs to determine the radioactive source before sequentially obtaining a plurality of energy spectrum sets of the anode readout plate under a plurality of different voltages when the anode readout plate is irradiated by the radioactive source. For example, the radioactive source can be a 5.9 keV 55Fe (iron) radioactive source, that is, the radioactive source uses iron 55 isotope, and is characterized by X-ray or gamma-ray with a ray energy of 5.9 keV. Thus, the energy spectrum set obtained in the subsequent process can be an X-ray energy spectrum set or a gamma-ray energy spectrum set.

[0056] It should be noted that the above is described by taking the radioactive source as a 5.9 keV 55Fe radioactive source, or in application, the technician can also determine the radioactive source according to actual conditions, which is not limited by the embodiments of the present application.

[0057] Step 102: Obtain the primary electron number, which is determined in advance according to the radioactive source and the gas environment.

[0058] In some embodiments, since different gas environments can affect the gain of the gas detector, the technician also needs to determine the current gas environment. For example, the gas environment can be 80% Ar (argon) plus 20% CO2 (carbon dioxide). Of course, the technician can also determine the gas environment according to actual conditions, and the embodiments of the present application do not limit the gas environment.

[0059] Continuing the description above, after determining the radioactive source and the gas environment, the technician can also determine the primary electron number in advance according to the determined radioactive source and the gas environment, so that the computer device or the gas detector can obtain the determined primary electron number, and thus continue the subsequent process.

[0060] In some embodiments, the technician can determine the primary electron number according to the ray energy corresponding to the radioactive source and the average ionization energy corresponding to the radioactive source in the gas environment. For example, assuming that the radioactive source is 5.9 keV 55Fe and the gas environment is 80% Ar plus 20% CO2, it can be known that the ray energy corresponding to the radioactive source is 5.9 keV, and the average ionization energy corresponding to the radioactive source is 26.8 eV (electron volts), and thus the technician can determine the primary electron number by dividing the ray energy by the average ionization energy.

[0061] It should be noted that the above is described in terms of determining the primary electron number by a person, or in application, the primary electron number can also be determined in real time by a computer device or a gas detector according to the radiation source and the gas environment; the above is described in terms of determining the primary electron number by dividing the ray energy by the average ionization energy, or in actual application, the primary electron number can also be determined by other ways. That is, the determination method of the primary electron number in the embodiments of the present application is not limited.

[0062] Continuing the description above, after the technical personnel determines the primary electron number according to the radiation source and the gas environment, the computer device or the gas detector can obtain the primary electron number, so as to continue the subsequent process.

[0063] Step 103: for each energy spectrum group corresponding to each voltage: based on the energy spectrum group and the primary electron number, obtaining the detector gain corresponding to the voltage; determining the gas parameter and the photon feedback item corresponding to the voltage; based on the detector gain corresponding to the voltage, the gas parameter corresponding to the voltage and the photon feedback item corresponding to the voltage, determining the width value of the avalanche air gap under the voltage.

[0064] Based on the description above, the energy spectrum group under multiple different voltages can be obtained, that is, multiple energy spectrum groups can be obtained. Thus, based on the energy spectrum group corresponding to the voltage and the primary electron number determined above, the detector gain corresponding to the voltage can be determined.

[0065] In some embodiments, the detector gain corresponding to different voltages can be obtained according to the following steps (1)-(2).

[0066] (1) for each energy spectrum in the energy spectrum group: determining the electron number corresponding to the energy spectrum; dividing the electron number corresponding to the energy spectrum by the primary electron number to obtain the initial gain corresponding to the energy spectrum.

[0067] That is, for multiple energy spectra corresponding to the same voltage, the electron number corresponding to each energy spectrum can be determined, for example, the peak value in the energy spectrum can be determined as the electron number corresponding to the energy spectrum, and then for the energy spectrum with the determined electron number, the determined electron number can be divided by the primary electron number to obtain the initial gain corresponding to the energy spectrum. Since the energy spectrum group includes multiple energy spectra, the initial gain corresponding to each of the multiple energy spectra can be determined according to the above steps, so as to obtain multiple initial gains.

[0068] As an example, it is assumed that 32 energy spectra can be obtained at the same voltage, i.e., 32 energy spectra correspond to each voltage, and the 32 energy spectra constitute an energy spectrum group at the voltage. If the voltage of the anode plate is 550 V, for the first energy spectrum in the 32 energy spectra, the peak value in the first energy spectrum can be determined as the number of electrons corresponding to the first energy spectrum, and then the number of electrons corresponding to the first energy spectrum is divided by the primary number of electrons to obtain the initial gain corresponding to the first energy spectrum. Similarly, the initial gains corresponding to the second energy spectrum to the 32nd energy spectrum can be respectively determined by the above-mentioned manner, so as to obtain 32 initial gains corresponding to the voltage of 550 V of the anode plate. Similarly, 32 initial gains corresponding to the voltage of other values of the anode plate can also be determined.

[0069] It should be noted that the above is described by dividing the number of electrons corresponding to the energy spectrum by the primary number of electrons to obtain the initial gain corresponding to the energy spectrum, or in application, the initial gain corresponding to the energy spectrum can also be determined by other manners, which is not limited by the embodiments of the application.

[0070] (2) fitting the initial gain corresponding to each energy spectrum in the energy spectrum group to obtain the detector gain corresponding to the voltage.

[0071] In order to improve the accuracy of the determined detector gain at a certain voltage, the plurality of initial gains determined at the voltage also need to be fitted to obtain the detection gain corresponding to the voltage.

[0072] Continuing the above example, it is assumed that the voltage of the anode plate is 550 V, and after obtaining 32 initial gains corresponding to the voltage of 550 V of the anode plate, the 32 initial gains can also be fitted to obtain the detector gain corresponding to the voltage of 550 V of the anode plate. For example, the fitting can be performed by calculating the average value of the 32 initial gains, and the obtained average value is determined as the detector gain corresponding to the voltage of 550 V of the anode plate. Similarly, the detector gains corresponding to the voltages of 560 V, 570 V, 580 V, 590 V, 600 V and 610 V of the anode plate can also be obtained.

[0073] It should be noted that the above is described by fitting by calculating the average value, or in application, the fitting can also be performed by other manners, which is not limited by the embodiments of the application.

[0074] After the detector gain corresponding to each voltage is determined, the gas parameter and the photon feedback item corresponding to each voltage can also be determined. The gas parameter is determined based on the gas environment and voltage simulation, and the gas parameter corresponding to different voltages can be different, so the gas parameter corresponding to each voltage needs to be determined.

[0075] In the gas discharge process, primary electrons collide with gas molecules under the acceleration of the electric field, and part of the energy is released in the form of photons in the collision process. Since these photons can propagate to other places in the discharge area, they can trigger new ionization. This additional ionization triggered by photons is called photon feedback. Since the photon feedback can affect the determined detector gain, it can reduce the accuracy of the determined width value of the avalanche gas gap. Therefore, in order to avoid the above situation, the photon feedback item corresponding to each voltage also needs to be determined.

[0076] Continuing the description above, after the above process, the detector gain, the gas parameter, and the photon feedback item corresponding to each voltage in the plurality of different voltages can be obtained. Therefore, the width value of the avalanche gas gap under each voltage can be determined according to the detector gain, the gas parameter, and the photon feedback item corresponding to each voltage.

[0077] As an example, the width value of the avalanche gas gap corresponding to each voltage in the plurality of different voltages can be determined according to the following formula (1);

[0078]

[0079] where G represents the detector gain corresponding to each voltage in the plurality of different voltages, a represents the gas parameter corresponding to the voltage, y represents the photon feedback item corresponding to the voltage, and d represents the width value of the avalanche gas gap corresponding to the voltage.

[0080] Since the width value of the avalanche gas gap corresponding to different voltages can be different, the width values of a plurality of different avalanche gas gaps can be obtained through the above steps. For example, when the anode plate voltage is 550V, the width value of the avalanche gas gap corresponding to 550V can be obtained based on the detector gain, the gas parameter, and the photon feedback item corresponding to 550V; when the anode plate voltage is 560V, the width value of the avalanche gas gap corresponding to 560V can be obtained based on the detector gain, the gas parameter, and the photon feedback item corresponding to 560V.

[0081] Step 104: determining the final width value of the avalanche gas gap of the gas detector based on the width values of the avalanche gas gaps under a plurality of different voltages.

[0082] Based on the above description, the width value of the avalanche air gap corresponding to different voltages can be different, so multiple width values of the avalanche air gap can be obtained. In order to further improve the accuracy of the determined width value of the avalanche air gap and ensure the measurement accuracy of the gas detector under different voltages, the final width value of the avalanche air gap of the gas detector can also be determined based on the width values of the avalanche air gap under multiple different voltages.

[0083] In some embodiments, the width values of the avalanche air gap under multiple different voltages can be fitted to obtain the final width value of the avalanche air gap of the gas detector. For example, the fitting can be performed by calculating the average of the width values of the avalanche air gap under the multiple different voltages, and the average is determined as the final width value of the avalanche air gap of the gas detector.

[0084] It should be noted that the above is described by fitting the multiple avalanche air gaps under the same voltage by calculating the average, or in application, the width values of the multiple avalanche air gaps under different voltages can also be fitted by other ways, which are not limited by the embodiments of the present application.

[0085] The embodiments of the present application can directly obtain the spectrum group of the anode readout plate irradiated by the radioactive source, avoid the influence of the charge diffusion on the resistive layer on the calculation of the detector gain corresponding to each voltage, improve the accuracy of the finally determined width value of the avalanche air gap of the gas detector, and further improve the accuracy of the gain calibration by combining the photon feedback term. In addition, the detector gain corresponding to multiple different voltages is calculated, and then the width values of the avalanche air gap under multiple voltages are obtained, and the multiple width values are fitted to determine the final width value of the avalanche air gap of the gas detector, which not only improves the accuracy of the determined width value of the avalanche air gap, but also ensures the measurement accuracy of the gas detector under different voltages.

[0086] Figure 2 is a structural schematic diagram of a width value determination device of an avalanche air gap of a gas detector provided by the embodiments of the present application, referring to Figure 2 The width value determination device of the avalanche air gap includes a first acquisition module 201, a second acquisition module 202, a first determination module 203, and a second determination module 204.

[0087] The first acquisition module 201 is configured to sequentially acquire multiple spectrum group sets of the anode readout plate irradiated by the radioactive source under multiple different voltages, each different voltage corresponding to a spectrum group set, and each spectrum group set including multiple spectra.

[0088] The second acquisition module 202 is configured to acquire the primary electron number, which is determined in advance according to the radioactive source and the gas environment.

[0089] The first determination module 203 is configured to, for each energy spectrum group corresponding to each voltage: obtain a detector gain corresponding to the voltage based on the energy spectrum group and the primary electron number; determine a gas parameter and a photon feedback item corresponding to the voltage; and determine a width value of the avalanche gas gap under the voltage based on the detector gain corresponding to the voltage, the gas parameter corresponding to the voltage, and the photon feedback item corresponding to the voltage.

[0090] The second determination module 204 is configured to determine a final width value of the avalanche gas gap of the gas detector based on the width values of the avalanche gas gap under the plurality of different voltages.

[0091] In some embodiments, the second determination module 204 is specifically configured to fit the width values of the avalanche gas gap under the plurality of different voltages to obtain the final width value of the avalanche gas gap of the gas detector.

[0092] In some embodiments, the first determination module 203 includes:

[0093] The determination sub-module is configured to, for each energy spectrum in the energy spectrum group: determine an electron number corresponding to the energy spectrum; and divide the electron number corresponding to the energy spectrum by the primary electron number to obtain an initial gain corresponding to the energy spectrum.

[0094] The fitting sub-module is configured to fit the initial gain corresponding to each energy spectrum in the energy spectrum group to obtain the detector gain corresponding to the voltage.

[0095] In some embodiments, the anode readout plate has a plurality of partitions, and the first acquisition module 201 includes:

[0096] The acquisition sub-module is configured to, for the anode readout plate under each voltage: acquire an energy spectrum corresponding to each partition in the plurality of partitions to obtain an energy spectrum group under the voltage.

[0097] The embodiment of the present application can obtain the spectrum group of the anode readout plate irradiated by the radioactive source directly, can avoid the influence on the calculation of the detector gain corresponding to each voltage due to the charge diffusion on the resistive layer, and improve the accuracy of the width value of the avalanche gas gap of the gas detector finally determined; in addition, the influence of the photon feedback on the scaling of the avalanche gas gap is reduced by combining the photon feedback term, and the accuracy of the width value of the avalanche gas gap determined is further improved, so that the accuracy of the gain scaling is improved; in addition, the detector gain corresponding to multiple different voltages is calculated, and then the width value of the avalanche gas gap under multiple voltages is obtained, and the multiple width values are fitted to determine the final width value of the avalanche gas gap of the gas detector, which can not only improve the accuracy of the width value of the avalanche gas gap determined, but also ensure the measurement accuracy of the gas detector under different voltages.

[0098] It should be noted that the width value determination device provided in the above embodiment is used to determine the width value of the avalanche gas gap of the gas detector, and the above functional modules are only used as examples, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the width value determination device of the avalanche gas gap of the gas detector provided in the above embodiment and the width value determination method of the avalanche gas gap of the gas detector belong to the same concept, and the specific implementation process is described in the method embodiment, which will not be repeated here.

[0099] Those skilled in the art can understand that all or part of the functions of the various methods in the above embodiments can be realized by hardware or by a computer program. When all or part of the functions in the above embodiments are realized by a computer program, the program can be stored in a computer readable storage medium, which can include read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc. The above functions are realized by executing the program by a computer. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, the above all or part of the functions are realized. In addition, when all or part of the functions in the above embodiments are realized by a computer program, the program can also be stored in a server, another computer, a storage medium such as a disk, an optical disk, a flash disk or a mobile hard disk, and is downloaded or copied into the memory of the local device, or the system of the local device is updated, and when the program in the memory is executed by the processor, all or part of the functions in the above embodiments are realized.

[0100] The above application of specific examples to illustrate the present invention, is only used to help understand the present invention, and does not limit the present invention. For the skilled in the art to which the present invention belongs, according to the idea of the present invention, several simple deductions, deformation or replacement can be made.

Claims

1. A method of determining a width value of an avalanche air gap of a gas detector, characterized by, The gas detector comprises an anode readout plate; the method comprises: obtaining a plurality of energy spectrum group of the anode readout plate irradiated by a radioactive source under a plurality of different voltages in sequence, each different voltage corresponding to an energy spectrum group, and each energy spectrum group comprising a plurality of energy spectrum; obtaining a primary electron number, which is determined in advance according to the radioactive source and a gas environment; for each energy spectrum group corresponding to each voltage: based on the energy spectrum group and the primary electron number, obtaining a detector gain corresponding to the voltage; determining a gas parameter and a photon feedback item corresponding to the voltage; based on the detector gain corresponding to the voltage, the gas parameter corresponding to the voltage and the photon feedback item corresponding to the voltage, determining a width value of an avalanche gas gap under the voltage; based on the width values of the avalanche gas gaps under the plurality of different voltages, determining a final width value of the avalanche gas gap of the gas detector; wherein, based on the energy spectrum group and the primary electron number, obtaining the detector gain corresponding to the voltage comprises: for each energy spectrum in the energy spectrum group: determining an electron number corresponding to the energy spectrum; dividing the electron number corresponding to the energy spectrum by the primary electron number to obtain an initial gain corresponding to the energy spectrum; fitting the initial gain corresponding to each energy spectrum in the energy spectrum group to obtain the detector gain corresponding to the voltage; wherein, the anode readout plate has a plurality of partitions, and the obtaining a plurality of energy spectrum group of the anode readout plate irradiated by a radioactive source under a plurality of different voltages in sequence comprises: for the anode readout plate under each voltage: obtaining an energy spectrum corresponding to each partition in the plurality of partitions to obtain the energy spectrum group under the voltage.

2. The method of claim 1, wherein, The determination of the final width value of the avalanche gas gap of the gas detector based on the width values of the avalanche gas gaps under the plurality of different voltages comprises: fitting the width values of the avalanche gas gaps under the plurality of different voltages to obtain the final width value of the avalanche gas gap of the gas detector.

3. An apparatus for determining the width of an avalanche gap of a gas detector, characterized in that The gas detector comprises an anode readout plate; the device comprises: a first obtaining module, configured to obtain a plurality of energy spectrum group of the anode readout plate irradiated by a radioactive source under a plurality of different voltages in sequence, each different voltage corresponding to an energy spectrum group, and each energy spectrum group comprising a plurality of energy spectrum; a second obtaining module, configured to obtain a primary electron number, which is determined in advance according to the radioactive source and a gas environment; a first determining module, configured to, for each energy spectrum group corresponding to each voltage: based on the energy spectrum group and the primary electron number, obtain a detector gain corresponding to the voltage; determine a gas parameter and a photon feedback item corresponding to the voltage; based on the detector gain corresponding to the voltage, the gas parameter corresponding to the voltage and the photon feedback item corresponding to the voltage, determine a width value of an avalanche gas gap under the voltage; a second determining module, configured to determine a final width value of the avalanche gas gap of the gas detector based on the width values of the avalanche gas gaps under the plurality of different voltages; a second determining module, configured to determine a final width value of the avalanche gas gap of the gas detector based on the width values of the avalanche gas gaps under the plurality of different voltages; The first determining module comprises: a determining submodule, configured to, for each energy spectrum in the energy spectrum group: determine the number of electrons corresponding to the energy spectrum; divide the number of electrons corresponding to the energy spectrum by the primary number of electrons to obtain an initial gain corresponding to the energy spectrum; and a fitting submodule, configured to fit the initial gain corresponding to each energy spectrum in the energy spectrum group to obtain a detector gain corresponding to the voltage. The anode readout plate has a plurality of partitions, and the first obtaining module comprises: an obtaining submodule, configured to, for the anode readout plate under each voltage: obtain an energy spectrum corresponding to each partition in the plurality of partitions to obtain an energy spectrum group under the voltage.

4. The apparatus of claim 3, wherein, The second determining module is specifically configured to: fit the width values of the avalanche air gaps under the plurality of different voltages to obtain a final width value of the avalanche air gap of the gas detector.

5. A computer readable storage medium, characterized in that, The medium has stored thereon a computer program, and the computer program can be executed by the processor to implement the method according to any one of claims 1-2.

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