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

Abstract

The invention discloses a method for determining the width value of an avalanche air 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 reading plate under a plurality of different voltages when the anode reading plate is irradiated by a radioactive source; obtaining an original electron number; for the energy spectrum group corresponding to each voltage, obtaining the 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 a width value of an avalanche air gap under the voltage based on a detector gain corresponding to the voltage, a gas parameter corresponding to the voltage and a photon feedback item corresponding to the voltage; and determining the final width value of the avalanche air gap of the gas detector based on the width values of the avalanche air gaps under the plurality of different voltages. According to the invention, the accuracy of the determined width value of the avalanche air gap can be improved, so that the avalanche air gap of the gas detector is accurately calibrated.

Description

Technical Field

[0001] The present invention relates to the field of detector technology, and in particular to a method for determining the width of an avalanche gap of a gas detector and a related device. Background Art

[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. MTPC detector system usually uses Micromegas gas detector (Micro Mesh Gas Chamber) to avalanche amplify drift electrons, and the gain multiple and energy resolution of 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 exact width value of the avalanche gap. Summary of the invention

[0003] The embodiment of the present application provides a method and a related device for determining the width of the avalanche gap of a gas detector, which can improve the accuracy of the determined width 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 a width value of an avalanche gap of a gas detector is provided, wherein the gas detector includes an anode readout plate; the method includes:

[0005] Sequentially obtaining a plurality of energy spectrum graph groups when the anode readout plate is irradiated by a radiation source at a plurality of different voltages, each different voltage corresponds to an energy spectrum graph group, and each energy spectrum graph group includes a plurality of energy spectrum graphs;

[0006] Obtaining the number of primary electrons, the number of primary electrons being predetermined according to the radiation source and the gas environment;

[0007] For each energy spectrum group corresponding to a voltage: based on the energy spectrum group and the number of primary electrons, obtain the detector gain corresponding to the voltage; determine the gas parameters and photon feedback term corresponding to the voltage; based on the detector gain corresponding to the voltage, the gas parameters corresponding to the voltage, and the photon feedback term corresponding to the voltage, determine the width value of the avalanche gap at the voltage;

[0008] Based on the width values ​​of the avalanche gap at the multiple different voltages, a final width value of the avalanche gap of the gas detector is determined.

[0009] Optionally, determining a final avalanche gap width value of the gas detector based on the avalanche gap width values ​​at the multiple different voltages comprises:

[0010] The width values ​​of the avalanche gaps at the multiple different voltages are fitted to obtain a final width value of the avalanche gap of the gas detector.

[0011] Optionally, obtaining the detector gain corresponding to the voltage based on the energy spectrum group and the primary electron number includes:

[0012] For each energy spectrum in the energy spectrum group: determining the number of electrons corresponding to the energy spectrum; dividing the number of electrons corresponding to the energy spectrum by the original number of electrons to obtain an initial gain corresponding to the energy spectrum;

[0013] The initial gain corresponding to each energy spectrum in the energy spectrum group is fitted to obtain the detector gain corresponding to the voltage.

[0014] Optionally, the anode readout plate has a plurality of partitions, and sequentially obtaining a plurality of energy spectrum groups of the anode readout plate when irradiated by a radiation source at a plurality of different voltages comprises:

[0015] For the anode readout plate at each voltage: obtaining an energy spectrum graph corresponding to each of the multiple partitions to obtain an energy spectrum graph group at the voltage.

[0016] On the other hand, a device for determining the width value of an avalanche gap of a gas detector is provided, wherein the gas detector comprises an anode readout plate; the device comprises:

[0017] A first acquisition module is used to sequentially acquire a plurality of energy spectrum graph groups when the anode readout plate is irradiated by a radiation source at a plurality of different voltages, each different voltage corresponds to an energy spectrum graph group, and each energy spectrum graph group includes a plurality of energy spectrum graphs;

[0018] A second acquisition module, used to acquire the number of primary electrons, wherein the number of primary electrons is predetermined according to the radiation source and the gas environment;

[0019] The first determination module is used for: for each energy spectrum group corresponding to a voltage, based on the energy spectrum group and the number of primary electrons, obtaining a detector gain corresponding to the voltage; determining a gas parameter and a photon feedback term corresponding to the voltage; and determining a width value of an avalanche gap at 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] The second determination module is used to determine a final avalanche gap width value of the gas detector based on the avalanche gap width values ​​at the multiple different voltages.

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

[0022] The width values ​​of the avalanche gaps at the multiple different voltages are fitted to obtain a final width value of the avalanche gap of the gas detector.

[0023] Optionally, the first determining module includes:

[0024] A determination submodule is used for: for each energy spectrum in the energy spectrum group: determining the number of electrons corresponding to the energy spectrum; dividing the number of electrons corresponding to the energy spectrum by the original number of electrons to obtain an initial gain corresponding to the energy spectrum;

[0025] The fitting submodule is used to fit the initial gain corresponding to each energy spectrum in the energy spectrum group to obtain the detector gain corresponding to the voltage.

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

[0027] The acquisition submodule is used for acquiring, for the anode readout plate at each voltage, an energy spectrum graph corresponding to each of the multiple partitions to obtain an energy spectrum graph group at the voltage.

[0028] On the other hand, a computer-readable storage medium is provided, wherein a computer program is stored in the storage medium, 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 gap of the gas detector as described above.

[0029] On the other hand, a computer program product comprising instructions is provided. When the instructions are executed on a computer, the computer is caused to execute the steps of the method for determining the width value of the avalanche gap of the gas detector.

[0030] The technical solution provided by this application can at least bring the following beneficial effects:

[0031] By directly obtaining the energy spectrum group when the anode readout plate is irradiated by the radiation source, the situation where the charge diffusion on the resistive layer affects 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 gap of the gas detector finally determined; moreover, combined with the photon feedback term, it is possible to reduce the influence of photon feedback on the calibration of the avalanche gap, further improve the accuracy of the determined avalanche gap width value, and thus improve the accuracy of the gain calibration; in addition, the detector gains corresponding to multiple different voltages will be calculated, and then the width values ​​of the avalanche gap at multiple voltages will be obtained, and the multiple width values ​​will be fitted to determine the final width value of the avalanche gap of the gas detector, which can not only improve the accuracy of the determined avalanche gap width value, but also ensure the measurement accuracy of the gas detector at different voltages. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A flow chart of a method for determining a width value of an avalanche gap of a gas detector provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of a device for determining the width value of an avalanche gap of a gas detector provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations 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 implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0036] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0037] Before explaining in detail the method for determining the width value of the avalanche gap of the gas detector provided in the embodiment of the present application, the application scenarios and implementation environments involved in the embodiment of the present application are first 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 detectors to avalanche amplify drift electrons. Micromegas gas detector is a parallel plate avalanche detector, and its structure is to insert a mesh-structured grid between the cathode and the anode, thereby dividing 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 area where the incident particles produce ionization, and the avalanche amplification zone (i.e., the avalanche air gap) is the area where the ionized electrons undergo avalanche amplification. Since the gain multiple and energy resolution of the Micromegas gas detector are crucial to 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 air gap of the Micromegas gas detector, that is, to determine the precise width value of the avalanche air gap.

[0039] Based on this, an embodiment of the present application provides a method for determining the width value of the avalanche gap of a gas detector. By directly obtaining multiple energy spectrum groups of the anode readout plate at multiple different voltages, it is possible to avoid the influence of 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; moreover, combined with the photon feedback term, it is possible to reduce the influence of photon feedback on the calibration of the avalanche gap, further improve the accuracy of the determined avalanche gap width value, and thus improve 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 in the embodiment of the present application may be a computer device or a gas detector with an avalanche gap.

[0041] When the execution subject is a computer device, after the computer device determines the width value of the avalanche gap of the gas detector, it can be applied 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 TV, etc.

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

[0043] Those skilled in the art should understand that the above-mentioned computer equipment and gas detector with avalanche air gap are only examples, and other existing or future computer equipment and gas detectors, if 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 included here by reference.

[0044] It should be noted that the application scenarios and implementation environments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the emergence of new application scenarios and the evolution of the implementation environment, the technical solutions provided in 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 in the embodiment of the present application is explained in detail.

[0046] Please refer to Figure 1 , Figure 1 This is a flow chart of a method for determining an avalanche gap value of a gas detector provided in an embodiment of the present application. The method comprises the following steps.

[0047] Step 101: sequentially obtain multiple energy spectrum graph groups when the anode readout plate is irradiated by a radiation source at multiple different voltages, each different voltage corresponds to an energy spectrum graph group, and each energy spectrum graph group includes multiple energy spectrum graphs.

[0048] The anode readout plate is an electronic component used in the detector. Its main function is to collect and process the electrical signals from the anode. Moreover, the anode readout plate can be used to detect the charges generated when particles pass through and convert these charges into measurable electrical signals. Thus, the energy spectrum of the anode readout plate when it is irradiated by the radiation source can be directly obtained.

[0049] In some embodiments, the anode readout plate has multiple partitions, and for the anode readout plate at each voltage: an energy spectrum corresponding to each partition in the multiple partitions is obtained to obtain an energy spectrum group at the voltage.

[0050] That is, since the anode readout plate may be divided into multiple partitions, and due to external factors, the energy spectra corresponding to the multiple partitions when irradiated by the radiation source at the same voltage may be different, that is, multiple different energy spectra may be obtained at the same voltage. Thus, at the same voltage, the energy spectrum group corresponding to the voltage can be obtained by obtaining the energy spectrum corresponding to each of the multiple partitions.

[0051] In order to improve the accuracy of the determined width value of the avalanche gap, the voltage of the anode plate readout plate can also be changed, so that the energy spectrum graph groups corresponding to the anode plate readout plate at multiple different voltages can be obtained in sequence, so that a more accurate width value of the avalanche gap can be determined based on the multiple energy spectrum graph groups in the subsequent process.

[0052] For example, it is assumed that the voltage range of the anode readout plate is 550 V to 610 V. Thus, when the voltage of the anode readout plate is 550 V and the anode readout plate is irradiated by a radiation source, the energy spectra corresponding to the multiple partitions of the anode readout plate can be obtained, thereby obtaining multiple energy spectra to obtain the energy spectra group corresponding to the voltage of the anode readout plate of 550 V. Similarly, the energy spectra groups corresponding to the voltages of the anode readout plate of 560 V, 570 V, 580 V, 590 V, 600 V, and 610 V can be obtained.

[0053] It should be noted that the voltage range of the anode readout plate is only an example. 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, a technician can manually change the voltage of the anode readout plate to obtain multiple energy spectrum graph groups corresponding to different voltages. Alternatively, a technician can pre-set multiple voltage values ​​of the anode readout plate, and after obtaining the energy spectrum graph groups corresponding to the corresponding voltages, the computer device or gas detector can automatically change the voltage of the anode readout plate to obtain multiple energy spectrum graph groups corresponding to different voltages.

[0055] In addition, in some embodiments, different values ​​of the width of the avalanche gap may be obtained due to different radiation sources. Therefore, before sequentially obtaining multiple energy spectrum graphs of the anode readout plate when irradiated by the radiation source at multiple different voltages, the technician needs to determine the radiation source. For example, the radiation source may be a 5.9keV (kiloelectronvolt) 55Fe (iron) radiation source, that is, the radiation source uses an iron-55 isotope, characterized by an X-ray or gamma ray with a ray energy of 5.9 kiloelectronvolts. In this way, the energy spectrum graph group obtained in the subsequent process may be an X-ray energy spectrum graph group or a gamma ray energy spectrum graph group.

[0056] It should be noted that the above description is based on the radiation source being 5.9keV 55Fe. Alternatively, in application, technicians may also determine the radiation source based on actual conditions, and the embodiments of the present application do not limit this.

[0057] Step 102: Obtain the number of primary electrons, which is predetermined based on the radiation source and the gas environment.

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

[0059] Continuing with the above description, after determining the radiation source and the gas environment, the technician can also predetermine the number of primary electrons based on the determined radiation source and the gas environment, so that the computer equipment or the gas detector can obtain the determined number of primary electrons to continue the subsequent process.

[0060] In some embodiments, technicians can determine the number of primary electrons based on the radiation energy corresponding to the radiation source and the average ionization energy corresponding to the radiation source in the gas environment. For example, assuming that the radiation source is 5.9keV 55Fe and the gas environment is 80% Ar plus 20% CO2, it can be seen that the radiation energy corresponding to the radiation source is 5.9keV and the corresponding average ionization energy is 26.8eV (electron volts). In this way, technicians can determine the number of primary electrons by dividing the radiation energy by the average ionization energy.

[0061] It should be noted that the above is explained by artificially determining the number of primary electrons, or, in application, the number of primary electrons 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 explained by determining the number of primary electrons by dividing the radiation energy by the average ionization energy, or, in practical applications, the number of primary electrons can also be determined by other methods. In other words, the embodiment of the present application does not limit the method for determining the number of primary electrons.

[0062] Continuing with the above description, after the technician predetermines the number of primary electrons based on the radiation source and the gas environment, the computer device or the gas detector can obtain the number of primary electrons to continue the subsequent process.

[0063] Step 103: For each energy spectrum group corresponding to a voltage: based on the energy spectrum group and the number of primary electrons, obtain the detector gain corresponding to the voltage; determine the gas parameters and photon feedback items corresponding to the voltage; based on the detector gain corresponding to the voltage, the gas parameters corresponding to the voltage, and the photon feedback items corresponding to the voltage, determine the width value of the avalanche gap at the voltage.

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

[0065] In some embodiments, the detector gains corresponding to different voltages may be obtained by following the steps (1)-(2).

[0066] (1) 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 original number of electrons to obtain an initial gain corresponding to the energy spectrum.

[0067] That is to say, for multiple energy spectra corresponding to the same voltage, the number of electrons corresponding to each energy spectra can be determined. For example, the peak value in the energy spectra can be determined as the number of electrons corresponding to the energy spectra. Then, for the energy spectra with the determined number of electrons, the determined number of electrons can be divided by the original number of electrons to obtain the initial gain corresponding to the energy spectra. Since the energy spectra group includes multiple energy spectra, the initial gains corresponding to the multiple energy spectra can be determined according to the above steps, thereby obtaining multiple initial gains.

[0068] As an example, assuming that at the same voltage, 32 energy spectra can be obtained, that is, each voltage corresponds to 32 energy spectra, and these 32 energy spectra constitute an energy spectra group at this voltage. If the current voltage of the anode plate is 550V, for the first energy spectra of the 32 energy spectra, the peak value in the first energy spectra can be determined as the number of electrons corresponding to the first energy spectra, and then, the number of electrons corresponding to the first energy spectra is divided by the number of original electrons to obtain the initial gain corresponding to the first energy spectra. Similarly, the initial gains corresponding to the second to the 32nd energy spectra can be determined respectively by the above method, thereby obtaining 32 initial gains corresponding to the anode plate voltage of 550V. Similarly, the 32 initial gains corresponding to other values ​​of the anode plate voltage can also be determined.

[0069] It should be noted that the above is explained by dividing the number of electrons corresponding to the energy spectrum by the number of original electrons to obtain the initial gain corresponding to the energy spectrum. Alternatively, in the application, the initial gain corresponding to the energy spectrum can also be determined by other methods, and the embodiments of the present application are not limited to this.

[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, it is also necessary to fit the multiple initial gains determined at the voltage to obtain the detection gain corresponding to the voltage.

[0072] Continuing with the above example, assuming that the current voltage of the anode plate is 550 V, after obtaining 32 initial gains corresponding to the voltage of the anode plate of 550 V, the 32 initial gains can also be fitted to obtain the detector gain corresponding to the voltage of the anode plate of 550 V. 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 the anode plate of 550 V. Similarly, the detector gains corresponding to the voltages of the anode plate of 560 V, 570 V, 580 V, 590 V, 600 V, and 610 V can also be obtained.

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

[0074] After determining the detector gain corresponding to each voltage, the gas parameters and photon feedback items corresponding to each voltage can also be determined. The gas parameters are determined based on the gas environment and voltage simulation, and the corresponding gas parameters may be different under different voltages. Therefore, it is necessary to determine the gas parameters corresponding to each voltage.

[0075] During the gas discharge process, the primary electrons collide with gas molecules under the acceleration of the electric field. During the collision, part of the energy is released in the form of photons. Since these photons propagate to other parts of the discharge area, they induce new ionization. This additional ionization induced by photons is called photon feedback. Since photon feedback may affect the determined detector gain, it reduces the accuracy of the determined avalanche gap width value. Therefore, in order to avoid the above situation, it is also necessary to determine the photon feedback term corresponding to each voltage.

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

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

[0078]

[0079] Wherein, G represents the detection gain corresponding to each voltage among the multiple different voltages, α represents the gas parameter corresponding to the voltage, γ represents the photon feedback term corresponding to the voltage, and d represents the width value of the avalanche gap corresponding to the voltage.

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

[0081] Step 104: Determine a final avalanche gap width value of the gas detector based on a plurality of avalanche gap width values ​​at different voltages.

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

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

[0084] It should be noted that the above is explained by fitting the multiple avalanche gaps under the same voltage by calculating the average value, or, in application, the width values ​​of the avalanche gaps under the multiple different voltages can be fitted by other methods, and the embodiments of the present application are not limited to this.

[0085] The embodiment of the present application can avoid the influence of charge diffusion on the resistive layer on the calculation of the detector gain corresponding to each voltage by directly obtaining the energy spectrum diagram group when the anode readout plate is irradiated by the radiation source, so as to improve the accuracy of the width value of the avalanche gap of the gas detector finally determined; moreover, combined with the photon feedback term, it can reduce the influence of photon feedback on the calibration of the avalanche gap, further improve the accuracy of the determined avalanche gap width value, thereby improving the accuracy of the gain calibration; in addition, the detector gains corresponding to multiple different voltages will be calculated, and then the width values ​​of the avalanche gap at multiple voltages will be obtained, and the multiple width values ​​will be fitted to determine the final width value of the avalanche gap of the gas detector, which can not only improve the accuracy of the determined avalanche gap width value, but also ensure the measurement accuracy of the gas detector at different voltages.

[0086] Figure 2 is a schematic diagram of a structure of a device for determining the width of an avalanche gap of a gas detector provided in an embodiment of the present application, see Figure 2 The device for determining the width value of an 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 used to sequentially acquire multiple energy spectrum graph groups when the anode readout plate is irradiated by a radiation source at multiple different voltages, each different voltage corresponds to an energy spectrum graph group, and each energy spectrum graph group includes multiple energy spectrum graphs;

[0088] A second acquisition module 202 is used to acquire the number of primary electrons, which is predetermined according to the radiation source and the gas environment;

[0089] The first determination module 203 is used for: for each energy spectrum group corresponding to a voltage, based on the energy spectrum group and the number of primary electrons, obtaining the detector gain corresponding to the voltage; determining the gas parameters and photon feedback term corresponding to the voltage; and determining the width value of the avalanche gap at the voltage based on the detector gain corresponding to the voltage, the gas parameters corresponding to the voltage, and the photon feedback term corresponding to the voltage;

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

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

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

[0093] A determination submodule is used for: for each energy spectrum in the energy spectrum group: determining the number of electrons corresponding to the energy spectrum; dividing the number of electrons corresponding to the energy spectrum by the original number of electrons to obtain an initial gain corresponding to the energy spectrum;

[0094] The fitting submodule is used 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 multiple partitions, and the first acquisition module 201 includes:

[0096] The acquisition submodule is used for acquiring, for the anode readout plate at each voltage, an energy spectrum corresponding to each partition in the plurality of partitions to obtain an energy spectrum group at the voltage.

[0097] The embodiment of the present application can avoid the influence of charge diffusion on the resistive layer on the calculation of the detector gain corresponding to each voltage by directly obtaining the energy spectrum diagram group when the anode readout plate is irradiated by the radiation source, so as to improve the accuracy of the width value of the avalanche gap of the gas detector finally determined; moreover, combined with the photon feedback term, it can reduce the influence of photon feedback on the calibration of the avalanche gap, further improve the accuracy of the determined avalanche gap width value, thereby improving the accuracy of the gain calibration; in addition, the detector gains corresponding to multiple different voltages will be calculated, and then the width values ​​of the avalanche gap at multiple voltages will be obtained, and the multiple width values ​​will be fitted to determine the final width value of the avalanche gap of the gas detector, which can not only improve the accuracy of the determined avalanche gap width value, but also ensure the measurement accuracy of the gas detector at different voltages.

[0098] It should be noted that: the width value determination device provided in the above embodiment only uses the division of the above functional modules as an example to illustrate when determining the width value of the avalanche air gap of the gas detector. In actual applications, the above functions can be assigned to different functional modules as needed, 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 air gap of the gas detector provided in the above embodiment and the width value determination method of the avalanche air gap of the gas detector belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0099] Those skilled in the art will appreciate that all or part of the functions of the various methods in the above-mentioned embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above-mentioned embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, and the storage medium can include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to implement the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the above-mentioned functions can be implemented. In addition, when all or part of the functions in the above-mentioned embodiments are implemented by computer programs, the program can also be stored in a storage medium such as a server, another computer, disk, optical disk, flash disk or mobile hard disk, and can be downloaded or copied and saved in 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-mentioned embodiments can be implemented.

[0100] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A method for determining the width of an avalanche gap of a gas detector, characterized in that: The gas detector includes an anode readout plate; the method includes: Sequentially obtaining a plurality of energy spectrum graph groups when the anode readout plate is irradiated by a radiation source at a plurality of different voltages, each different voltage corresponds to an energy spectrum graph group, and each energy spectrum graph group includes a plurality of energy spectrum graphs; Obtaining the number of primary electrons, the number of primary electrons being predetermined according to the radiation source and the gas environment; For each energy spectrum group corresponding to a voltage: based on the energy spectrum group and the number of primary electrons, obtain the detector gain corresponding to the voltage; determine the gas parameters and photon feedback term corresponding to the voltage; based on the detector gain corresponding to the voltage, the gas parameters corresponding to the voltage, and the photon feedback term corresponding to the voltage, determine the width value of the avalanche gap at the voltage; Based on the width values ​​of the avalanche gap at the multiple different voltages, a final width value of the avalanche gap of the gas detector is determined.

2. The method according to claim 1, characterized in that The determining of a final avalanche gap width value of the gas detector based on the avalanche gap width values ​​at the multiple different voltages comprises: The width values ​​of the avalanche gaps at the multiple different voltages are fitted to obtain a final width value of the avalanche gap of the gas detector.

3. The method according to claim 1, characterized in that The obtaining of the detector gain corresponding to the voltage based on the energy spectrum group and the primary electron number includes: For each energy spectrum in the energy spectrum group: determining the number of electrons corresponding to the energy spectrum; dividing the number of electrons corresponding to the energy spectrum by the original number of electrons to obtain an initial gain corresponding to the energy spectrum; The initial gain corresponding to each energy spectrum in the energy spectrum group is fitted to obtain the detector gain corresponding to the voltage.

4. The method according to claim 1, characterized in that The anode readout plate has a plurality of partitions, and sequentially obtaining a plurality of energy spectrum groups of the anode readout plate when irradiated by a radiation source at a plurality of different voltages comprises: For the anode readout plate at each voltage: obtaining an energy spectrum graph corresponding to each of the multiple partitions to obtain an energy spectrum graph group at the voltage.

5. A device 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 acquisition module is used to sequentially acquire a plurality of energy spectrum graph groups when the anode readout plate is irradiated by a radiation source at a plurality of different voltages, each different voltage corresponds to an energy spectrum graph group, and each energy spectrum graph group includes a plurality of energy spectrum graphs; A second acquisition module, used to acquire the number of primary electrons, wherein the number of primary electrons is predetermined according to the radiation source and the gas environment; The first determination module is used for: for each energy spectrum group corresponding to a voltage, based on the energy spectrum group and the number of primary electrons, obtaining a detector gain corresponding to the voltage; determining a gas parameter and a photon feedback term corresponding to the voltage; and determining a width value of an avalanche gap at 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; The second determination module is used to determine a final avalanche gap width value of the gas detector based on the avalanche gap width values ​​at the multiple different voltages.

6. The device according to claim 5, characterized in that The second determining module is specifically used for: The width values ​​of the avalanche gaps at the multiple different voltages are fitted to obtain a final width value of the avalanche gap of the gas detector.

7. The device according to claim 5, characterized in that The first determining module comprises: A determination submodule is used for: for each energy spectrum in the energy spectrum group: determining the number of electrons corresponding to the energy spectrum; dividing the number of electrons corresponding to the energy spectrum by the original number of electrons to obtain an initial gain corresponding to the energy spectrum; The fitting submodule is used to fit the initial gain corresponding to each energy spectrum in the energy spectrum group to obtain the detector gain corresponding to the voltage.

8. The device according to claim 5, characterized in that The anode readout plate has a plurality of partitions, and the first acquisition module comprises: The acquisition submodule is used for acquiring, for the anode readout plate at each voltage, an energy spectrum graph corresponding to each of the multiple partitions to obtain an energy spectrum graph group at the voltage.

9. A computer-readable storage medium, characterized in that: A computer program is stored on the medium, and the computer program can be executed by a processor to implement the method according to any one of claims 1 to 4.

10. A computer program product comprising a computer program and / or instructions, characterized in that: When the computer program and / or the instructions are executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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