Small-scale source model calibration method and device based on experimental comparison method

Abstract

The present invention relates to a small-scale body source model calibration method and device based on an experimental comparison method, the method comprising: determining target points and numbering them; taking six small-scale body source potassium models, small-scale body source uranium models, small-scale body source thorium models and small-scale body source mixed models according to the numbers and placing them at the corner points of a regular hexagon at equal distances; obtaining the first measurement original data of a large-scale γ energy spectrum measurement system, calculating the first stripping coefficient of the calibrated instrument on the placement radius of each small-scale body source model; calculating the second stripping coefficient of the calibrated instrument on each large-scale model; calculating the stripping coefficient correction factor according to the first stripping coefficient and the second stripping coefficient, so as to correct the initial stripping coefficient of other large-scale γ energy spectrum measurement systems calibrated by the small-scale body source model, and obtaining a target stripping coefficient consistent with the calibration result of the large-scale model. The calibration cost is saved, the calibration efficiency is improved, and the purpose of unifying the calibration result unit and making the value accurate and reliable is achieved.

Description

Technical Field

[0001] The invention relates to the application field of ionizing radiation metrology calibration technology, and in particular to a small body source model calibration method and device based on an experimental comparison method. Background Art

[0002] The main standard model of airborne radioactivity measurement is the metrological standard for airborne radioactivity measurement. It is an indispensable basic device in the process of airborne radioactive element spectrum measurement such as uranium resource exploration, radioactive radiation environment investigation, nuclear emergency monitoring, as well as the unification of work measurement and measurement accuracy testing.

[0003] The existing main standard model for aviation radioactivity measurement was built in 1986. Due to the limitations of the technological development at that time, the single model of the main standard model occupies an area of ​​127.3m 2 , weighing 140 tons, is fixed at Shijiazhuang Daguocun Airport and is the only national defense and national metrology standard equipment for existing aviation radioactivity measurement. Every time the calibration of an aviation gamma spectrometer is carried out, the aircraft and the instrument to be calibrated must be transferred to the airport for calibration.

[0004] my country has a vast territory, and each time calibration work is carried out, the instrument to be calibrated needs to be transported to the airport for calibration. This makes the entire calibration process costly and has a long work cycle, which limits the number of users of aerial radioactivity measurement and restricts work efficiency. Summary of the invention

[0005] In view of this, a small body source model calibration method and device based on the experimental comparison method are provided to solve the problems in the related art that the main standard device cannot be moved, the calibration process is costly, the working cycle is long, and the working efficiency is low.

[0006] The present invention adopts the following technical solution:

[0007] In a first aspect, an embodiment of the present application provides a small body source model calibration method based on an experimental comparison method, the method comprising:

[0008] Determine the place to be tested according to the set site selection rules, determine each target point in the place to be tested, and number each target point according to the radius, wherein the number is used to indicate the placement of each model;

[0009] According to the numbering, for the small body source potassium model, the small body source uranium model, the small body source thorium model and the small body source mixed model, six small body source models of each type are respectively placed at the corner points of a regular hexagon with equal distances, wherein any side surface of each small body source model is aligned with the detector of the large γ energy spectrum measurement system;

[0010] For each placement radius of each small volume source model, first measurement raw data of the large-scale gamma spectrum measurement system is obtained, and the first measurement data are numbered according to the model type and placement position;

[0011] According to the stripping coefficient calculation method and the first measurement raw data, respectively calculate the first stripping coefficient of the calibrated instrument on the placement radius of each small volume source model;

[0012] Calculating a second peeling coefficient of the calibrated instrument on each large-scale model; calculating a peeling coefficient correction factor based on the first peeling coefficient and the second peeling coefficient;

[0013] Applying the stripping coefficient correction factor to correct the initial stripping coefficient of other large-scale gamma spectrum measurement systems to be calibrated on the small-scale body source model to obtain a target stripping coefficient, wherein the target stripping coefficient is consistent with the stripping coefficient of the large-scale gamma spectrum measurement system calibrated on the large-scale model;

[0014] Other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model are calibrated based on the target stripping coefficient.

[0015] In a second aspect, an embodiment of the present application provides a small volume source model calibration device based on an experimental comparison method, the device comprising:

[0016] A target point determination module is used to determine the place to be tested according to the set site selection rules, determine each target point in the place to be tested, and number each target point according to the radius, wherein the number is used to indicate the placement of each model;

[0017] A model placement module is used to take six small body source models of each type, namely, the small body source potassium model, the small body source uranium model, the small body source thorium model and the small body source mixed model, and place them at the corner points of a regular hexagon with equal distances according to the numbering, wherein any side surface of each small body source model is aligned with the detector of the large γ energy spectrum measurement system;

[0018] A first measurement module is used to obtain first measurement raw data of the large-scale gamma spectrum measurement system for each placement radius of each small volume source model, and to number the first measurement data according to model type and placement position;

[0019] A first calculation module is used to calculate the first peeling coefficient of the calibrated instrument on each small volume source model placement radius according to the peeling coefficient calculation method and the first measurement raw data;

[0020] A second calculation module, used for calculating a second peeling coefficient of the calibrated instrument on each large-scale model;

[0021] A correction factor calculation module, used for calculating a peeling coefficient correction factor according to the first peeling coefficient and the second peeling coefficient;

[0022] A target stripping coefficient calculation module is used to apply a stripping coefficient correction factor to correct an initial stripping coefficient of a large-scale gamma energy spectrum measurement system to be calibrated on a small-scale body source model to obtain a target stripping coefficient, wherein the target stripping coefficient is consistent with the stripping coefficient of the large-scale gamma energy spectrum measurement system calibrated on the large-scale model;

[0023] A calibration module is used to calibrate other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model based on the target stripping coefficient.

[0024] The present invention solves the technical problem of calibrating the stripping coefficient of a large-scale gamma spectrum measurement system with a small body source model. By improving and upgrading the stripping coefficient calibration technology, the existing fixed calibration method can be freed from the limitation of the main standard model of large-scale aviation radioactive measurement, and the mobility of the calibration work of the large-scale gamma spectrum measurement system is improved. When the small body source model is used to calibrate the large-scale gamma spectrometer measurement system, the calibration stripping coefficient deviation caused by the volume or density change of the metrological standard model is eliminated; the working cost of the calibration process is saved, the calibration work cycle is shortened, and the work efficiency is improved. It provides a fast-response calibration technology solution for radioactive element spectrum measurement work such as uranium resource exploration, radiation environment aviation survey, and nuclear emergency aviation monitoring. The purpose of unified calibration result units and accurate and reliable values ​​is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a flow chart of a small body source model calibration method based on an experimental comparison method provided by an embodiment of the present invention;

[0027] Figure 2 It is a position relationship diagram of a small body source model and a large γ-ray spectrometer detector applicable in the embodiment of the present application;

[0028] Figure 3 It is a relative position relationship diagram of a small body source model, an existing aviation model, and a large γ spectrum detector applicable in the embodiment of the present application;

[0029] Figure 4 is a peeling coefficient correction factor K applicable in the embodiment of the present applicationα Simulation calculation curve diagram of the placement radius of the small body source model;

[0030] Figure 5 is a peeling coefficient correction factor K applicable in the embodiment of the present application β Simulation calculation curve diagram of the placement radius of the small body source model;

[0031] Figure 6 is a peeling coefficient correction factor K applicable in the embodiment of the present application γ Simulation calculation curve diagram of the placement radius of the small body source model;

[0032] Figure 7 It is a structural schematic diagram of a small volume source model calibration device based on an experimental comparison method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] Example

[0035] First, the application background and applicable scenarios of the present application are explained. The present invention relates to the application field of ionizing radiation metrology and calibration technology, and provides calibration technology methods for radioactive element spectrum measurement such as uranium resource exploration, radiation environment aerial survey, nuclear emergency aerial monitoring, etc. in my country, as well as the unification of work measurement units and measurement accuracy testing, providing a metrology technology foundation for ionizing radiation research and production applications.

[0036] Figure 1 A flowchart of a small body source model calibration method based on the experimental comparison method provided by an embodiment of the present invention. The method can be executed by a small body source model calibration device based on the experimental comparison method provided by an embodiment of the present invention. The device can be implemented in software and / or hardware. Figure 1 , the method may specifically include the following steps:

[0037] S101. Determine a site to be tested according to a set site selection rule, determine each target point in the site to be tested, and number each target point according to a radius, wherein the number is used to indicate the placement of each model.

[0038] The site selection rules include the ambient radiation background level, the uniformity of the radiation field distribution, the area and the characteristics of the buildings within the surrounding setting range. In a specific example, a place with a flat, clean and tidy ground, an ambient radiation background level lower than 50nGy / h, a uniform radiation field distribution, an area larger than 15m×15m, and no tall buildings within 100m is selected as the test site.

[0039] Optionally, each target point is determined in the place to be tested, which can be specifically achieved in the following manner: in the place to be tested, the ground projection position of the center point of the detector of the large γ spectrum measurement system is used as the coordinate origin, the positive direction of the detector is the Y-axis direction, and the corner point position of the inscribed regular hexagon with a radius is set as the center point position of the small body source model to determine each target point. Among them, 0.00m, 0.43m, 0.87m, 1.30m, 1.73m, 2.17m, 2.60m, 3.03m, 3.46m, 3.90m, 4.33m, 4.76m, 5.20m, 5.63m, 6.06m, 6.50m, and 6.93m are used as the circle radius, and the corner point position of the inscribed regular hexagon is the center point position of the small body source model. In a specific example, the orientation of the regular hexagon is best when two symmetrical points thereof fall on the X-axis or the Y-axis. Each determined point is called a target point, and each determined point is numbered according to the radius for use in model placement.

[0040] S102. According to the numbering, for the small body source potassium model, the small body source uranium model, the small body source thorium model and the small body source mixed model, six small body source models of each type are respectively placed at the corner points of a regular hexagon with equal distances, wherein any side surface of each small body source model is aligned with the detector of the large γ energy spectrum measurement system.

[0041] Specifically, six of each type of bulk source potassium model, small bulk source uranium model, small bulk source thorium model and small bulk source mixed model are evenly placed at the corner points of a regular hexagon with equal distances, with one side of the model facing the detector.

[0042] S103. For each placement radius of each small volume source model, first measurement raw data of the large-scale gamma spectrum measurement system is obtained, and the first measurement data are numbered according to the model type and placement position.

[0043] Optionally, the first measurement raw data includes the energy window count rate and the mass content of each element. Specifically, each placement radius of each model is measured to obtain the measurement raw data of the large-scale γ-spectrum measurement system, which is called the first measurement raw data. The first measurement data is numbered according to the model type and placement position. In this way, the radius of a certain placement position can be determined by numbering.

[0044] S104, calculating the first peeling coefficient of the calibrated instrument on each placement radius of the small volume source model according to the peeling coefficient calculation method and the first measurement original data.

[0045] Among them, α r , β r , γ r The first stripping coefficient is described below. The calculation process of the stripping coefficient is described below. The calculation process of the first stripping coefficient and the second stripping coefficient can be performed by referring to the calculation process of the stripping coefficient. According to JJG (Military Industry) 26-2012 "Calibration Procedure for Aviation Gamma Spectrometer", JJG (Military Industry) 150-2017 "Calibration Procedure for Vehicle-mounted Gamma Spectrometer" or related operating instructions, the raw data measured by the large-scale gamma spectrometer are processed to obtain the potassium, uranium, and thorium window count rates measured by the calibrated instrument on the background, potassium, uranium, thorium, and mixed models, where the background model is represented by b, the potassium model is represented by k, the thorium model is represented by t, and the mixed model is represented by m.

[0046] Exemplarily, an energy window stripping coefficient matrix is ​​established according to the first window counting rates of potassium, uranium and thorium and the mass contents of potassium, uranium and thorium elements of a small body source model; the energy window stripping coefficient matrix is ​​solved to obtain the first stripping coefficient matrix and the energy window detection sensitivity coefficient matrix of the calibrated instrument at each radius; and the corresponding first stripping coefficient is obtained in the first stripping coefficient matrix.

[0047] In a specific example, the background model method is used to subtract the ambient radiation background from the measured data. ij =N ij -N bj , where N bj is the count rate of the jth energy window measured by the calibrated instrument in the background radiation environment, in s -1 ; N ij is the count rate of the jth energy window of the calibrated instrument on the i-th model, in s -1 ;n ij is the net count rate of the calibrated instrument in the jth energy window on the i-th model after deducting the background, in units of s -1 i represents potassium, uranium, thorium, and mixed model, respectively, and j represents K, U, and Th energy windows, respectively. By solving the matrix equation, the energy window stripping coefficient matrix A of the calibrated instrument is calculated, n ij =C ij ×[A·S]

[0048] in,

[0049] The calculation results are:

[0050] Where n jiis the net count rate of the calibrated instrument in the jth energy window on the i-th model after deducting the background, in units of s -1 ; C ji is the mass content reference value of the jth element in the ith model, where the mass content of potassium is in %, and the mass content of uranium and thorium is in μg / g; A is the stripping coefficient matrix, dimensionless; S is the energy window detection sensitivity matrix, s k is the detection sensitivity of potassium window to potassium content, unit (s -1 ) / (%),s u is the detection sensitivity of the uranium window to the uranium content, unit (s -1 ) / (μg / g), s t is the detection sensitivity of the thorium window to the thorium content, unit (s -1 ) / (μg / g).

[0051] Therefore, according to the mass content of potassium, uranium and thorium elements of the small body source model input by simulation, and the first window count rate of potassium, uranium and thorium, the first stripping coefficient of the calibrated instrument at each radius is calculated by applying the set stripping coefficient calculation method. It should be noted that "first" and "second" are only for distinction and have no actual meaning.

[0052] S105, calculating the second peeling coefficient of the calibrated instrument on each large model.

[0053] Optionally, this can be implemented as follows:

[0054] Firstly, according to the set calibration procedures, the calibrated instrument is measured on a large background model, a large potassium model, a large uranium model, a large thorium model and a large mixed model to obtain the second measurement original data of the large gamma energy spectrum measurement system on the large background model, the large potassium model, the large uranium model, the large thorium model and the large mixed model.

[0055] Specifically, according to the verification procedures, the same calibrated instrument is measured on the existing large-scale background, large-scale potassium, large-scale uranium, large-scale thorium, and large-scale mixed airborne radioactivity measurement models. The measurement raw data of the large-scale gamma energy spectrum measurement system on the large-scale background, large-scale potassium, large-scale uranium, large-scale thorium, and large-scale mixed models are obtained, which are called the second measurement raw data. Optionally, the second measurement raw data includes the energy window count rate and the mass content of each element.

[0056] In a specific example, Figure 2 A diagram showing the positional relationship between a small body source model and a large γ-ray spectrometer detector is shown; Figure 3 The relative position relationship diagram of a small body source model, an existing aviation model, and a large γ spectrum detector is shown in Figure 3In the figure, the smaller regular hexagon used for illustration is a small volume source model, which is set at the corner point of the regular hexagon; the larger regular hexagon used for illustration is an existing aviation model, in which, Figure 3 The number of small and medium-sized body source models is only for reference and does not constitute a specific limitation. Figure 2 and Figure 3 This is just an example and does not constitute a specific limitation.

[0057] Secondly, according to the stripping coefficient calculation method and the second measurement original data, the second stripping coefficient of the calibrated instrument on each large model is calculated respectively.

[0058] Among them, α0, β0, and γ0 are the second peeling coefficients, and the specific calculation method refers to the description in S104, which will not be repeated here.

[0059] S106, calculating a peeling coefficient correction factor according to the first peeling coefficient and the second peeling coefficient.

[0060] Exemplarily, it can be implemented in the following way: take the quotient of the second peeling coefficient and the corresponding first peeling coefficient to obtain the peeling coefficient correction factor at each radius; according to the peeling coefficient correction factor at different radii and the radius size, the least square fitting method is used to calculate the functional relationship between the radius and the peeling coefficient correction factor to obtain each peeling coefficient correction factor. In this way, the peeling coefficient correction factor corresponding to any radius can be determined. In a specific example, the peeling coefficient correction factor is expressed as follows:

[0061] S107, applying the stripping coefficient correction factor to correct the initial stripping coefficient of other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model to obtain a target stripping coefficient, wherein the target stripping coefficient is consistent with the stripping coefficient of the large-scale gamma energy spectrum measurement system calibrated on the large model.

[0062] In actual application, the stripping coefficient obtained by calibrating a large gamma spectrometer using a small body source model has a certain systematic deviation from the calibration result of the existing large-scale aviation radioactivity measurement standard model. The stripping coefficients α, β, and γ must be corrected before the results can be used for measurement production.

[0063] Specifically, according to the simulated calibration results of the same calibrated instrument on two different models, the stripping coefficient correction factor of the small body source model placed at different radii is calculated, and the stripping coefficient measured by the small body source model is called the initial stripping coefficient, which is then applied to the stripping coefficient correction factor corresponding to the radius to correct the initial stripping coefficient of other large-scale γ-ray spectrum measurement systems to be calibrated on the small body source model to obtain the target stripping coefficient. The target stripping coefficient is consistent with the stripping coefficient of the large-scale γ-ray spectrum measurement system calibrated on the large model, so that the calibration result unit is unified and the value is accurate and reliable.

[0064] In a specific example, the correction factor product method is used to correct the stripping coefficient of the small volume source model calibration: α c =K α α; β c =K β β; γ c =K γ ·γ; where α c , β c , γ c are the corrected results of the peeling coefficients α, β, and γ, dimensionless; K α , K β , K γ is the correction factor for the peeling coefficient, dimensionless.

[0065] S108. Calibrate other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model based on the target stripping coefficient.

[0066] In the actual application process, the initial stripping coefficient is corrected by using the stripping coefficient correction factor to obtain the target stripping coefficient, which can be achieved in the following ways: identifying the radius of the initial stripping coefficient; using the stripping coefficient correction factor corresponding to the radius of the initial stripping coefficient to correct the initial stripping coefficient of other large-scale γ-ray spectrum measurement systems to be calibrated on the small body source model to obtain the target stripping coefficient.

[0067] In a specific example, a small movable aerial radioactivity measurement model standard device is transported to a designated calibration site, and a circle is determined with the ground projection of the center point of the large gamma spectrometer detector as the origin and a radius of 1.75m to 4.75m; the corner points of the regular hexagon inscribed in the circle are used as the center points of the small body source models; the calibrated instrument is used to measure the environmental radiation background once without placing any small body source models; potassium, uranium, thorium or mixed models are placed at pre-specified positions, respectively, and the calibrated instrument is used to measure and record the original measurement data, so as to prepare for the calculation of the stripping coefficient correction factor.

[0068] The present invention solves the technical problem of calibrating the stripping coefficient of a large-scale gamma spectrum measurement system with a small body source model. By improving and upgrading the stripping coefficient calibration technology, the existing fixed calibration method can be freed from the limitation of the main standard model of large-scale aviation radioactive measurement, and the mobility of the calibration work of the large-scale gamma spectrum measurement system is improved. When the small body source model is used to calibrate the large-scale gamma spectrometer measurement system, the calibration stripping coefficient deviation caused by the volume or density change of the metrological standard model is eliminated; the working cost of the calibration process is saved, the calibration work cycle is shortened, and the work efficiency is improved. It provides a fast-response calibration technology solution for radioactive element spectrum measurement work such as uranium resource exploration, radiation environment aviation survey, and nuclear emergency aviation monitoring. The purpose of unified calibration result units and accurate and reliable values ​​is achieved.

[0069] On the basis of the above technical scheme, before calibrating other large-scale gamma spectrum measurement systems to be calibrated on the small-scale body source model based on the target stripping coefficient, it also includes: calculating the indication error of the mass content of potassium, uranium and thorium elements of the calibrated instrument; accordingly, calibrating other large-scale gamma spectrum measurement systems to be calibrated on the small-scale body source model based on the target stripping coefficient, which can be specifically achieved in the following way: if the indication error is greater than the set error threshold, calibrating other large-scale gamma spectrum measurement systems to be calibrated on the small-scale body source model based on the target stripping coefficient.

[0070] Optionally, the elemental mass contents of potassium, uranium and thorium of the calibrated instrument are measured data of a small mixing model.

[0071] Specifically, the mixed model measurement data is used to test the indication error of the calibrated instrument. m，j =n m，j ×[A·S] -1 .

[0072] in:

[0073]

[0074] Where n m.j is the count rate of the jth energy window of the calibrated instrument in the hybrid model, in s -1 ;c m.j is the element content indication of the calibrated instrument on the mixed model, c m.k It is the potassium content, unit %, c m.u It is the content of uranium, in μg / g, c m.t It is the indication of thorium content, unit is μg / g.

[0075] The indication error of potassium, uranium and thorium content of the calibrated instrument is expressed as:

[0076]

[0077]

[0078]

[0079] In the formula, δ r.k is the relative indication error percentage of potassium content, δ r.u is the relative indication error percentage of uranium content, δ r.t is the relative indication error percentage of thorium content; C m.k is the reference value of potassium content in the mixed model, C m.u is the reference value of uranium content in the mixing model, C m.t is the reference value of thorium content in the mixing model.

[0080] When δ r.k , δ r.u , δ r.t When the error of the indicated value of any element content is greater than ±5%, the stripping coefficient calibration result is considered to have failed. It is necessary to analyze the calibrated instrument and the calibration process, find out the cause of the failure and improvement measures, and re-carry out the calibration work.

[0081] Using the above technical solution, the simulation calculation results of the stripping coefficient correction factor are shown in Figure 4 , Figure 5 and Figure 6 , Figure 4 A peel coefficient correction factor K is shown α Simulation calculation curve diagram of the placement radius of the small body source model; Figure 5 A peel coefficient correction factor K is shown β Simulation calculation curve diagram of the placement radius of the small body source model; Figure 6 A peel coefficient correction factor K is shown γ The simulation calculation curve of the small body source model placement radius. According to the above results, when the small body source model is placed at a radius between 1.75m and 4.75m, the stripping coefficient correction factor does not exceed 1.00±0.10, and the correction introduced error is small.

[0082] In addition, the embodiments of the present application also have the following beneficial effects: when using a small body source model to calibrate a large γ spectrometer measurement system carried by a manned aircraft, a car, an unmanned aerial vehicle, an intelligent robot and other platforms, the placement method and placement position of the small body source model involved, and the on-site calibration method of the large γ spectrum measurement system adopted; the stripping coefficient correction method of the calibrated instrument, the size of the correction factor, and the method for determining the correction factor; the technical process of calibrating a large γ spectrum measurement system with a small body source model, including: the determination process of the stripping coefficient correction factor, the calculation method of the stripping coefficient correction factor at different model placement radii, the application of the model placement radius involved in the calibration process of the large γ spectrum measurement system, and the correction method and correction amount of the stripping coefficient calibrated by the small body source model. The small body source model standard device adopted by the present invention has an appearance or structural geometric size of 0.5cm to 50cm in height and a diameter or side length of 0.5cm to 50cm.

[0083] In addition, although some domestic and foreign technical institutions have used point sources or surface sources to calibrate large-scale γ-ray spectrum measurement systems, the calibration effect and accuracy have not been compared with the existing large-scale aviation radioactivity measurement model standard device. In order to avoid these on-site calibration technology loopholes, the small volume source model in the present invention should cover point source and surface source models as much as possible.

[0084] Figure 7 The present invention is a schematic diagram of a small body source model calibration device based on an experimental comparison method provided by an embodiment of the present invention. The device is suitable for executing a small body source model calibration method based on an experimental comparison method provided by an embodiment of the present invention. Figure 7 As shown, the device may specifically include a target point determination module 701, a model placement module 702, a first measurement module 703, a first calculation module 704, a second calculation module 705, a correction factor calculation module 706, a target stripping coefficient calculation module 707 and a calibration module 708.

[0085] The target point determination module 701 is used to determine the site to be tested according to the set site selection rules, determine each target point in the site to be tested, and number each target point according to the radius, wherein the number is used to indicate the placement of each model; the model placement module 702 is used to, according to the number, for the small body source potassium model, the small body source uranium model, the small body source thorium model and the small body source mixed model, respectively take six small body source models of each type and place them at the corner points of a regular hexagon with equal distances, wherein any side of each small body source model is aligned with the detector of the large γ energy spectrum measurement system; the first measurement module 703 is used to obtain the first measurement raw data of the large γ energy spectrum measurement system for each placement radius of each small body source model, and number the first measurement data according to the model type and placement position; the first calculation module 704 is used to obtain the first measurement raw data of the large γ energy spectrum measurement system for each placement radius of each small body source model, and number the first measurement data according to the model type and placement position; the first calculation module 705 is used to obtain the first measurement raw data of the large γ energy spectrum measurement system for each placement radius of each small body source model, and number the first measurement data according to the model type and placement position; the first calculation module 706 is used to obtain the first measurement raw data of the large γ energy spectrum measurement system for each small body source model, and number the first measurement data according to the model type and placement position. 04, used to calculate the first peeling coefficient of the calibrated instrument on the placement radius of each small body source model according to the peeling coefficient calculation method and the first measurement original data; the second calculation module 705, calculates the second peeling coefficient of the calibrated instrument on each large model; the correction factor calculation module 706, used to calculate the peeling coefficient correction factor according to the first peeling coefficient and the second peeling coefficient; the target peeling coefficient calculation module 707, used to apply the peeling coefficient correction factor to correct the initial peeling coefficient of other large-scale γ-ray spectrum measurement systems to be calibrated on the small body source model to obtain the target peeling coefficient, wherein the target peeling coefficient is consistent with the peeling coefficient of the large-scale γ-ray spectrum measurement system calibrated on the large model; the calibration module 708, used to calibrate other large-scale γ-ray spectrum measurement systems to be calibrated on the small body source model based on the target peeling coefficient.

[0086] The present invention solves the technical problem of calibrating the stripping coefficient of a large-scale gamma spectrum measurement system with a small body source model. By improving and upgrading the stripping coefficient calibration technology, the existing fixed calibration method can be freed from the limitation of the main standard model of large-scale aviation radioactive measurement, and the mobility of the calibration work of the large-scale gamma spectrum measurement system is improved. When the small body source model is used to calibrate the large-scale gamma spectrometer measurement system, the calibration stripping coefficient deviation caused by the volume or density change of the metrological standard model is eliminated; the working cost of the calibration process is saved, the calibration work cycle is shortened, and the work efficiency is improved. A fast-response calibration technical solution is provided for radioactive element spectrum measurement work such as uranium resource exploration, radiation environment aviation survey, and nuclear emergency aviation monitoring.

[0087] Optionally, the second calculation module 705 is specifically used for:

[0088] According to the set verification procedure, the calibrated instrument is measured on the large background model, the large potassium model, the large uranium model, the large thorium model and the large mixed model to obtain the second measurement original data of the large γ spectrum measurement system on the large background model, the large potassium model, the large uranium model, the large thorium model and the large mixed model; according to the stripping coefficient calculation method and the second measurement original data, the second stripping coefficient of the calibrated instrument on each large model is calculated respectively.

[0089] Optionally, the target point determination module 701 is specifically used for:

[0090] In the test site, the ground projection position of the center point of the detector of the large γ energy spectrum measurement system is taken as the coordinate origin, the positive direction of the detector is the Y-axis direction, and the corner point position of the inscribed regular hexagon of the radius is set as the center point position of the small body source model to determine the positions of various target points.

[0091] Optionally, the site selection rules are set to include the environmental radiation background level, the uniformity of the radiation field distribution, the area, and the characteristics of the buildings within the surrounding set range.

[0092] Optionally, the first measurement raw data and the second measurement raw data include energy window counting rate and mass content of each element respectively.

[0093] Optionally, the first calculation module 704 is specifically configured to:

[0094] The energy window stripping coefficient matrix is ​​established according to the energy window counting rates of potassium, uranium and thorium and the mass contents of potassium, uranium and thorium elements in the small body source model;

[0095] The energy window stripping coefficient matrix is ​​solved to obtain the first stripping coefficient matrix and the energy window detection sensitivity coefficient matrix of the calibrated instrument at each radius;

[0096] The corresponding first peeling coefficient is obtained in the first peeling coefficient matrix.

[0097] Optionally, the correction factor calculation module 706 is specifically used for:

[0098] The second peeling coefficient is divided by the corresponding first peeling coefficient to obtain a peeling coefficient correction factor at each radius;

[0099] According to the peeling coefficient correction factor at different radii and the radius size, the functional relationship between the radius and the peeling coefficient correction factor is calculated by the least square fitting method to obtain various peeling coefficient correction factors.

[0100] Optionally, the target stripping coefficient calculation module 707 is specifically used for:

[0101] Identify the radius of the initial peel coefficient;

[0102] The stripping coefficient correction factor corresponding to the radius of the initial stripping coefficient is used to correct the initial stripping coefficient of other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model to obtain the target stripping coefficient.

[0103] Optionally, it also includes a judgment module, which is used to calculate the indication error of the mass content of potassium, uranium and thorium elements of the calibrated instrument before calibrating the small body source model based on the target stripping coefficient;

[0104] Accordingly, the small volume source model is calibrated based on the target stripping coefficient, including:

[0105] If the indication error is greater than the set error threshold, other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model are calibrated based on the target stripping coefficient.

[0106] Optionally, the elemental mass contents of potassium, uranium and thorium of the calibrated instrument are measured data of a small mixing model.

[0107] The small body source model calibration device based on the experimental comparison method provided in an embodiment of the present invention can execute the small body source model calibration method based on the experimental comparison method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0108] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0109] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0110] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0111] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0112] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0113] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0114] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0115] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0116] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A small body source model calibration method based on experimental comparison method, characterized in that: include: Determine the place to be tested according to the set site selection rules, determine each target point in the place to be tested, and number each target point according to the radius, wherein the number is used to indicate the placement of each model; According to the numbering, for the small body source potassium model, the small body source uranium model, the small body source thorium model and the small body source mixed model, six small body source models of each type are respectively placed at the corner points of a regular hexagon with equal distances, wherein any side surface of each small body source model is aligned with the detector of the large γ energy spectrum measurement system; For each placement radius of each small volume source model, first measurement raw data of the large-scale gamma spectrum measurement system are obtained, and the first measurement raw data are numbered according to the model type and placement position; According to the stripping coefficient calculation method and the first measurement raw data, respectively calculate the first stripping coefficient of the calibrated instrument on the placement radius of each small volume source model; calculating a second peeling coefficient of the calibrated instrument on each large-scale model; Calculating a peeling coefficient correction factor according to the first peeling coefficient and the second peeling coefficient; The stripping coefficient correction factor is applied to correct the initial stripping coefficient of other large-scale gamma spectrum measurement systems to be calibrated on the small-scale body source model to obtain a target stripping coefficient, wherein the target stripping coefficient is consistent with the stripping coefficient of the large-scale gamma spectrum measurement system calibrated on the large-scale model; based on the target stripping coefficient, the other large-scale gamma spectrum measurement systems to be calibrated on the small-scale body source model are calibrated.

2. The method according to claim 1, characterized in that The calculating the second peeling coefficient of the calibrated instrument on each large model comprises: According to the set verification procedure, the calibrated instrument is measured on a large background model, a large potassium model, a large uranium model, a large thorium model and a large mixed model to obtain second measurement raw data of the large gamma energy spectrum measurement system on the large background model, the large potassium model, the large uranium model, the large thorium model and the large mixed model; According to the stripping coefficient calculation method and the second measurement raw data, the second stripping coefficient of the calibrated instrument on each large-scale model is calculated respectively.

3. The method according to claim 1, characterized in that The step of determining each target point in the place to be tested includes: In the test site, the ground projection position of the center point of the detector of the large γ spectrum measurement system is taken as the coordinate origin, the positive direction of the detector is the Y-axis direction, and the corner point position of the inscribed regular hexagon of the radius is set as the center point position of the small body source model to determine each target point.

4. The method according to claim 1, characterized in that: The set site selection rules include the environmental radiation background level, the uniformity of the radiation field distribution, the area and the characteristics of the buildings within the surrounding set range.

5. The method according to claim 2, characterized in that: The first measurement raw data and the second measurement raw data respectively include an energy window count rate and a mass content of each element.

6. The method according to claim 1, characterized in that The calculating of the peeling coefficient correction factor according to the first peeling coefficient and the second peeling coefficient comprises: Taking the quotient of the second peeling coefficient and the corresponding first peeling coefficient to obtain a peeling coefficient correction factor at each radius; According to the peeling coefficient correction factor at different radii and the radius size, the functional relationship between the radius and the peeling coefficient correction factor is calculated by the least square fitting method to obtain various peeling coefficient correction factors.

7. The method according to claim 1, characterized in that The stripping coefficient correction factor is applied to correct the initial stripping coefficient of other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model to obtain the target stripping coefficient, including: identifying a radius of the initial peel coefficient; The initial peeling coefficient of other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model is corrected by using a peeling coefficient correction factor corresponding to the radius of the initial peeling coefficient to obtain a target peeling coefficient.

8. The method according to claim 1, characterized in that Before calibrating other large-scale gamma energy spectrum measurement systems to be calibrated on the small-scale body source model based on the target stripping coefficient, the method further includes: Calculating the indication errors of the mass contents of potassium, uranium and thorium elements of the calibrated instrument; Accordingly, calibrating other large-scale gamma energy spectrum measurement systems to be calibrated on the small-scale body source model based on the target stripping coefficient includes: If the indication error is greater than a set error threshold, other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model are calibrated based on the target stripping coefficient.

9. The method according to claim 8, characterized in that The elemental mass contents of potassium, uranium and thorium for the calibrated instrument are measured data from a small mixing model.

10. A small volume source model calibration device based on experimental comparison method, characterized in that: include: A target point determination module is used to determine the place to be tested according to the set site selection rules, determine each target point in the place to be tested, and number each target point according to the radius, wherein the number is used to indicate the placement of each model; A model placement module is used to take six small body source models of each type, namely, the small body source potassium model, the small body source uranium model, the small body source thorium model and the small body source mixed model, and place them at the corner points of a regular hexagon with equal distances according to the numbering, wherein any side surface of each small body source model is aligned with the detector of the large γ energy spectrum measurement system; A first measurement module, for acquiring first measurement raw data of the large-scale gamma spectrum measurement system for each placement radius of each small volume source model, and numbering the first measurement raw data according to model type and placement position; A first calculation module is used to calculate the first peeling coefficient of the calibrated instrument on each small volume source model placement radius according to the peeling coefficient calculation method and the first measurement raw data; A second calculation module, used for calculating a second peeling coefficient of the calibrated instrument on each large-scale model; A correction factor calculation module, used for calculating a peeling coefficient correction factor according to the first peeling coefficient and the second peeling coefficient; A target stripping coefficient calculation module is used to apply a stripping coefficient correction factor to correct an initial stripping coefficient of other large-scale gamma spectrum measurement systems to be calibrated on the small-scale body source model to obtain a target stripping coefficient, wherein the target stripping coefficient is consistent with the stripping coefficient of the large-scale gamma spectrum measurement system calibrated on the large-scale model; A calibration module is used to calibrate other large-scale gamma energy spectrum measurement systems to be calibrated on the small volume source model based on the target stripping coefficient.

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