Thermoluminescence dating device using low-dose source irradiation

Abstract

The invention relates to the technical field of thermoluminescence dating, and discloses a thermoluminescence dating device using low-dose source irradiation, comprising: a detection module adopting a multi-channel detection technology and having a built-in photon detector; the heating module is used for heating the sample to be detected, releasing energy stored in the sample and generating a thermoluminescence signal; the radiation module is used for irradiating the sample and simulating radiation conditions in a natural environment; the data acquisition and analysis module is responsible for recording the signal from the detection module and processing and analyzing the signal; and the mounting module is used for placing a sample to be tested. The thermoluminescence dating device provided by the invention is simple in structure and convenient for a user to load and sample, and can realize that the irradiation unit is close to the limit of the sample and increase the source dose rate, thereby realizing the purpose of low-dose source irradiation, simplifying the equipment management and approval procedures, and then more accurately compensating signal deviation caused by external factors, and improving the dating accuracy of the thermoluminescence dating device. And the measurement precision of the thermoluminescence dating device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoluminescence dating, and in particular to a thermoluminescence dating device using low-dose source irradiation. Background Art

[0002] Thermoluminescence dating is a technique used to determine when certain minerals, such as quartz and feldspar, were last heated or exposed to sunlight. The method is commonly used in archaeology and geology to date pottery, burned earth and other materials that have been treated with high temperatures.

[0003] Thermoluminescence dating is a device used to date ancient porcelain. Thermoluminescence dating measures the high-temperature peak of 110 degrees, and the high temperature of 110 degrees decays rapidly over time, so existing equipment requires a large radiation source. Existing thermoluminescence dating instruments must use a large-dose radiation source (radiation source of Category 5 or above) to work properly and conduct rapid irradiation tests. At present, the only thermoluminescence dating device that can be used is the Danish Riso DA20 C / D dating device. There are no related devices in China. Riso's equipment needs to be irradiated with a large-dose radiation source before it can be used. Large-dose radiation sources are strictly controlled facilities by the state. The application for large-dose radiation sources requires environmental protection and other approvals, which makes it impossible to promote the equipment. It has strict requirements on business premises, etc. and can only be limited to some universities and research institutions. It is difficult to obtain a license and it cannot work without using an exempt source, which is extremely inconvenient.

[0004] Therefore, it is necessary to design a thermoluminescence dating device using low-dose source irradiation to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a thermoluminescence dating device using low-dose source irradiation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A thermoluminescence dating device using low-dose source irradiation includes: a detection module: using multi-channel detection technology, with a built-in photon detector for detecting and quantifying the number of photons released from a sample; a heating module: heating the sample to be tested, releasing the energy stored in the sample, and generating a thermoluminescence signal; a radiation module: the radiation module is used to irradiate the sample, simulate the radiation conditions in the natural environment, and establish a dose response curve; a data acquisition and analysis module: responsible for recording the signal from the detection module, processing and analyzing it, and finally calculating the age of the sample; an installation module: this module is used to place the sample to be tested and integrate other modules.

[0007] As a preferred technical solution of the present invention, the installation module includes: a detection chamber, a radiation source installation position and a detection position are provided at the top of the detection chamber, and the radiation source installation position and the detection position are respectively installed with a radiation module and a detection module; a mounting plate, the detection chamber is installed on the mounting plate; a push plate, which is arranged parallel to the inside of the detection chamber, and a placement groove for installing a heating module is provided on the push plate; an opening, which is opened on the side wall of the detection chamber, and the opening is for the push plate to pass through; a cover plate, a connecting member is provided between the cover plate and the mounting plate, and the cover plate corresponds to the opening through the connecting member; a moving component, the moving component is used to drive the push plate to move.

[0008] As a preferred technical solution of the present invention, the connecting member includes two fixing blocks fixedly connected to the side wall of the mounting plate, the two side walls of the cover plate are respectively rotatably connected to the fixing blocks, and a torsion spring is provided at the connection between the cover plate and the fixing blocks.

[0009] As a preferred technical solution of the present invention, the moving component includes a motor fixedly installed on the side wall of the detection chamber, and the motor is directly opposite to the opening. The end of the output shaft of the motor is axially connected with a lead screw, the free end of the lead screw is rotatably connected to the inner side of the detection chamber, an installation frame for guiding is fixed on the inner bottom surface of the detection chamber, and the lead screw is located inside the installation frame. A moving block with a T-shaped cross-section is threadedly sleeved on the lead screw, the moving block is fixed to the bottom of the push plate, and the moving block is slidably connected to the inner side of the installation frame.

[0010] As a preferred technical solution of the present invention, a plurality of slots are provided on the side wall and the bottom of the moving block, and rotatable rotating balls are provided inside the slots.

[0011] As a preferred technical solution of the present invention, the distance between the push plate and the radiation unit of the radiation module is ≤2 mm.

[0012] As a preferred technical solution of the present invention, in the detection module, the photon detector is one of a multi-channel photomultiplier tube, an avalanche photodiode, and a superconducting nanowire detector.

[0013] As a preferred technical solution of the present invention, in the detection module, a multifunctional quantum dot-graphene composite material is provided, and this composite material is used to enhance the detection sensitivity of the detector.

[0014] As a preferred technical solution of the present invention, a heating element and a thermocouple array are provided in the heating module, and the heating element is a microwave generator.

[0015] As a preferred technical solution of the present invention, a dynamic adjustment control mechanism is provided in the data acquisition and analysis module for adjusting the environmental conditions during the dating process. The dynamic adjustment control mechanism includes: Adaptive fuzzy PID control: Combining fuzzy logic and PID control to provide feedback regulation ability; Genetic algorithm for optimizing PID parameters: Finding the optimal solution by performing iterative selection, crossover, and mutation operations on PID parameters; Online learning mechanism: Real-time monitoring of the system's performance indicators to optimize the control effect.

[0016] The present invention has the following beneficial effects: 1. Improve measurement accuracy: Through adaptive fuzzy PID control, genetic algorithm for optimizing the initial PID parameters, and online learning mechanism, the system can more accurately compensate for signal deviations caused by external factors, effectively cope with environmental interferences such as temperature fluctuations and humidity changes, which significantly improves the measurement accuracy of the thermoluminescence dating device, reduces errors, and enhances the robustness and stability of the system; 2. Improve experimental efficiency and automation level: The intelligent control algorithm reduces the time and effort of manual debugging, quickly responds to system changes, and timely adjusts the control quantity. The design of the installation module simplifies the operation process, thereby improving experimental efficiency and automation level and reducing the need for manual intervention; 3. Reduce the dependence on high-dose radiation sources: The design of the installation module enables the irradiation unit to be infinitely close to the heating module, achieving an effect equivalent to high-dose irradiation, reducing the device's dependence on high-dose radiation sources, simplifying the device management and approval procedures, and improving the flexibility and applicability of the system; 4. Reduce equipment cost and maintenance difficulty: The design of the installation module enables the device to be adapted to low-dose source irradiation, and it has a simple structure and convenient operation, which reduces the equipment cost and complexity, reduces the need for strict management and approval procedures. The intelligent control system reduces the workload of manual debugging and maintenance, making the daily maintenance of the equipment more convenient and improving the economy and practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a thermoluminescence dating device using low-dose source irradiation proposed by the present invention; Figure 2 It is a schematic structural diagram inside the detection chamber; Figure 3 It is a schematic structural diagram of the moving block; Figure 4 It is a system block diagram of a thermoluminescence dating device using low-dose source irradiation proposed by the present invention; Figure 5 It is a flowchart of the dynamic adjustment control mechanism; Figure 6 It is a flowchart of the adaptive fuzzy PID control; Figure 7 Flowchart for optimizing PID parameters using genetic algorithm.

[0018] In the figure: 1 mounting plate, 2 detection chamber, 3 opening, 4 push plate, 5 placement slot, 6 radiation source mounting position, 7 detection position, 8 cover plate, 9 motor, 10 mounting frame, 11 screw rod, 12 moving block, 13 fixed block, 14 torsion spring, 15 sealing ring, 16 slot, 17 rotating ball. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Embodiment 1

[0020] Reference Figures 1-7 , a thermoluminescence dating device using low-dose source irradiation, including a detection module, a heating module, a radiation module, a data acquisition and analysis module and an installation module, wherein the detection module: adopts multi-channel detection technology, has a built-in photon detector, and is used to detect and quantify the number of photons released from the sample; the heating module: heats the sample, releases the energy stored in the sample, and generates a thermoluminescence signal; the radiation module: the radiation module is used to irradiate the sample, simulate the radiation conditions in the natural environment, and establish a dose response curve; the data acquisition and analysis module: the data acquisition and analysis module is responsible for recording the signal from the detection module, processing and analyzing it, and finally calculating the age of the sample; the installation module: this module is used to place the sample to be tested and integrate other modules.

[0021] Further, the photon detector is one of a multi-channel photomultiplier tube, an avalanche photodiode, and a superconducting nanowire detector, which has high sensitivity and can convert weak optical signals into electrical signals; The detection module also includes a filter. Specifically, a multi-channel filter array is installed at the front end of the detector, each filter covers a different wavelength range. Furthermore, the filter is a tunable filter, and the wavelength range of the filter can be dynamically adjusted according to actual needs to achieve more flexible multi-channel detection; Furthermore, in the detection module, a multifunctional quantum dot-graphene composite material is provided to enhance the sensitivity of the detector detection. The specific steps of preparing and applying the composite material are as follows: Step 1: Selection and preparation of quantum dots. Common quantum dot materials such as CdSe, CdTe or PbS are selected. These materials have excellent optical properties. The size of quantum dots is precisely controlled and their emission wavelength is adjusted to match the emission spectrum of the sample. Step 2: Graphene preparation and functionalization. High-quality single-layer or multi-layer graphene is prepared by chemical vapor deposition (CVD) or mechanical exfoliation method. The graphene is functionalized, such as introducing functional groups or compounding with other nanomaterials, to improve its optoelectronic properties and compatibility with quantum dots; Step 3: Mix the quantum dots and graphene to obtain a composite material, including physical mixing method: The prepared quantum dots and graphene are uniformly mixed by physical mixing methods such as ultrasonic dispersion or ball milling to form a quantum dot-graphene composite material; Chemical bonding method: The quantum dots are fixed on the surface of graphene by chemical bonding to form a stable composite structure. For example, silane coupling agents or other organic molecules are used as bridging agents to connect the quantum dots and graphene together; Step 4: Integrate the composite material onto a photodetector, including: Detector design: Multi-layer structure design: Design a multi-layer structure and integrate the quantum dot-graphene composite material into the sensitive layer of the photodetector. For example, add a layer of quantum dot-graphene film in front of a photomultiplier tube (PMT) or an avalanche photodiode (APD).

[0022] Multi-channel detection: Combine multi-channel detection technology, use quantum dots of different sizes to cover multiple wavelength ranges, and monitor multiple signals simultaneously.

[0023] The integration process includes: Spin coating method: Spin coat the quantum dot-graphene composite material solution on the surface of the detector to form a uniform film; Chemical vapor deposition (CVD) method: Directly grow a graphene layer on the surface of the detector, and then introduce quantum dots by physical mixing or chemical bonding methods.

[0024] Step 5: Detection and analysis. Use a high-speed data acquisition card to ensure that signals in multiple wavelength ranges can be collected simultaneously. For example, an 8-channel data acquisition card can be configured, and each channel corresponds to a wavelength range. Through a real-time monitoring system, record the signal changes in each wavelength range during the experiment and capture instantaneous information.

[0025] The combination of the excellent optical properties of quantum dots and the high carrier mobility of graphene significantly improves the sensitivity of the photodetector, enhances the photon capture efficiency, reduces the need for high-intensity radiation sources. By controlling the size of the quantum dots, their emission wavelengths can be adjusted to cover multiple wavelength ranges, enabling multi-channel detection, which helps to capture more sample information and reduce information loss caused by single-wavelength measurement. Among them, the high conductivity and mechanical strength of graphene improve the stability and uniform distribution of quantum dots, reducing the degradation risk. The high carrier mobility and fast response time of graphene are suitable for transient signal detection, improving the overall performance of the detector. Example Two

[0026] Reference Figure 4 , the heating module is provided with a heating element, a temperature controller and a cooling system. The heating element is a microwave generator. By using the microwave heating method, microwave energy can penetrate the interior of the sample, making the whole sample heated evenly, avoiding local overheating, and having a faster heating speed than the traditional heating method, which can significantly shorten the experiment time, with high energy utilization rate and reduced unnecessary energy consumption.

[0027] Furthermore, the heating module further includes a thermocouple array. A plurality of thermocouples are arranged around the sample to monitor the temperature changes at different positions in real time, ensuring that all parts of the sample are heated evenly. Further, for the selection of thermocouples: select high-precision thermocouples such as type K, type T, etc., to ensure accurate temperature measurement within the experimental temperature range; for the array layout: arrange a plurality of thermocouples around the sample to form a thermocouple array, and determine the optimal number and position of thermocouples according to the shape and size of the sample to achieve comprehensive monitoring of the temperature of all parts of the sample; secondly, parameters such as the power of microwave heating are controlled and adjusted by the data acquisition and analysis module.

[0028] By combining the thermocouple array with multi-point temperature monitoring and microwave heating technologies, the heating uniformity and temperature control accuracy of thermoluminescence dating can be significantly improved. Example Three

[0029] The data acquisition and analysis module specifically includes: Data acquisition unit: It includes a high-speed and high-resolution data acquisition card, which is responsible for high-speed and high-resolution real-time acquisition of data from various sensors such as photodetectors, temperature sensors, and dose sensors. Select a data acquisition card that supports a high sampling rate such as several MHz to several hundred MHz and a high resolution such as 24 bits or higher to ensure that fast-changing signals can be captured, reduce signal distortion, and improve measurement accuracy; it also includes a real-time signal processing unit, which integrates an embedded processor such as an FPGA or a DSP on the data acquisition card for real-time signal processing, and performs preliminary processing such as filtering and denoising during data acquisition to reduce the time and computational amount of subsequent processing, reducing the time and computational amount of subsequent processing; Multi-sensor fusion interface: It supports a variety of sensor interfaces, adopts timestamp synchronization technology to ensure the time consistency of data from different sensors, fuses the data from different sensors, provides more comprehensive information, ensures the time consistency of data from different sensors, and facilitates subsequent analysis; Intelligent Data Analysis Platform: It includes a data preprocessing module that preprocesses the collected data, removes outliers and invalid data to ensure the integrity and accuracy of the data; machine learning models that use historical data to train machine learning models such as Convolutional Neural Network (CNN), Support Vector Machine (SVM), etc. for automatic classification and feature extraction; a user interface that develops a graphical user interface to facilitate users to set parameters, view results and generate reports, and provides interactive tools that allow users to flexibly adjust parameters and view results by dragging, clicking, etc., making it convenient for users to operate. Real-time Feedback and Optimization Algorithm: It includes a feedback control system that dynamically adjusts experimental parameters according to real-time data, sets a dynamic adjustment control mechanism to adjust the behavior of the system such as heating power, irradiation dose, etc. to ensure the consistency of experimental conditions; optimization algorithms that adopt optimization algorithms such as genetic algorithm, particle swarm optimization, etc. to find the optimal experimental conditions and improve the experimental efficiency and result accuracy.

[0030] Data Visualization and Interaction Tools, including: a data visualization library that uses mature visualization libraries such as Matplotlib, Plotly, etc. to generate various types of charts such as line charts, heatmaps, 3D charts, etc., and displays complex data in an intuitive chart form to help researchers better understand the data; an interaction interface that provides flexible interaction tools to allow users to adjust parameters and view results according to their needs.

[0031] Furthermore, the dynamic adjustment control mechanism includes: Adaptive Fuzzy PID (Proportional-Integral-Derivative) Control, specifically including: A fuzzy controller whose core is a fuzzy rule base that generates an adjustment amount of the output variable, i.e., the PID gain, according to the input variables, namely the error and its change rate. The main components of the fuzzy controller are: Input variables: e(t)=r(t)-y(t), where e(t) is the error at the current moment, i.e., the error between the set value r(t) and the actual measured value y(t); de(t) / dt, i.e., the change rate of the error. Output variables: ΔK p , the adjustment amount of the proportional gain; ΔK i , the adjustment amount of the integral gain; ΔK d , the adjustment amount of the derivative gain; Fuzzy rule base: Defines how to adjust the PID gain according to the fuzzy sets of the input variables.

[0032] Furthermore, the fuzzy inference process includes three steps: fuzzification, fuzzy rule application (i.e., fuzzy inference), and defuzzification: Fuzzification: Maps the input variables to fuzzy sets; Fuzzy rule application: Generates a fuzzy output according to the fuzzy rule base; Defuzzification: Converts the fuzzy output into a specific numerical output. The output u(t) of the adaptive fuzzy PID controller is expressed as: ; where, K p (t) is the proportional gain, which directly affects the response to the current error, K i (t) is the integral gain, which accumulates the influence of all past errors and helps to eliminate the steady-state error, K d (t) is the derivative gain, which predicts future errors in advance according to the rate of change of the error and makes adjustments, is the integral of the error, which accumulates all errors from the start to the current moment and helps to eliminate the steady-state error. Even in the absence of instantaneous errors, if there is a cumulative error, the integral term will generate a control output to correct this cumulative error.

[0033] The dynamic adjustment control mechanism also includes genetic algorithm optimization of PID parameters. Specifically: The genetic algorithm (GA) is a global optimization method based on the principles of natural selection and genetics. By simulating the process of biological evolution, GA can find the optimal solution in a complex search space. In PID control, GA can be used to optimize the initial PID parameters.

[0034] The basic steps of the genetic algorithm include: Initializing the population: Randomly generate a set of PID parameters (K p , K i , K d ) as the initial population; Fitness evaluation: Calculate the fitness value of each individual, and use performance metrics such as mean square error MSE or integral absolute error IAE to evaluate; For example, the fitness value is , where ϵ is a very small constant to prevent the denominator from being zero, and T represents the time range of the entire experiment or control process; Selection operation: Select individuals to enter the next generation according to the fitness value. Commonly used selection methods include roulette wheel selection, tournament selection, etc.; Crossover operation: Perform a crossover operation on the selected individuals to generate new individuals; Mutation operation: Perform a mutation operation on the newly generated individuals to introduce random perturbations and maintain population diversity; Termination condition: When the preset maximum number of iterations is reached or the fitness value converges, terminate the algorithm and output the optimal PID parameters.

[0035] The dynamic adjustment control mechanism also includes an online learning mechanism To further improve the system's adaptability and robustness, an online learning mechanism is introduced on the basis of adaptive fuzzy PID control. The online learning mechanism dynamically adjusts the parameters in the fuzzy rule base by real-time monitoring of system performance indicators such as the sum of squared errors (SSE) or mean squared error (MSE), thereby optimizing the control effect, specifically including: Performance indicators: Evaluate the performance of the control system. For example, the performance indicators are: ; Parameter update rules: Use the gradient descent method or other optimization algorithms to dynamically adjust the parameters in the fuzzy rule base according to the changes in performance indicators. For example: , where θ is the parameter in the fuzzy rule base, η is the learning rate, θ k represents the parameter vector at the k-th iteration, and θ k+1 represents the updated parameter vector at the (k + 1)-th iteration.

[0036] Periodic update: After each control cycle ends, calculate the performance indicator of the current cycle and update the parameters in the fuzzy rule base according to the calculation result.

[0037] The thermoluminescence dating device may face various complex environmental conditions, such as temperature fluctuations, humidity changes, etc. Adaptive fuzzy PID control can effectively cope with these changes, maintain the stability of the system, can more precisely control the experimental conditions, reduce errors, and improve the measurement accuracy. Fuzzy logic and the online learning mechanism enhance the system's ability to cope with complex environments, improve the stability and reliability of the system. Secondly, it reduces manual intervention, improves the automation degree and efficiency of the experiment, and solves the limitations of experimental conditions in the prior art. Embodiment 4

[0038] The installation module includes: A detection chamber 2, on the top of the detection chamber 2, there are a radiation source installation position 6 and a detection position 7. The radiation source installation position 6 and the detection position 7 are respectively installed with a radiation module and a detection module; An installation plate 1, and the detection chamber 2 is installed on the installation plate 1; A push plate 4, which is arranged parallel to the inside of the detection chamber 2. A placement groove 5 for installing a heating module is opened on the push plate 4; An opening 3, which is opened on the side wall of the detection chamber 2, and the opening 3 allows the push plate 4 to pass through; A cover plate 8, there is a connecting member between the cover plate 8 and the installation plate 1, and the cover plate 8 corresponds to the opening 3 through the connecting member. Further, a sealing ring 15 is provided on the side wall of the cover plate 8 facing the opening 3, which can ensure the sealing inside the detection chamber 2 and prevent factors such as light transmission from affecting the accuracy and reliability of the experimental results; A moving component, which is used to drive the push plate 4 to move.

[0039] Further, the connecting member includes two fixing blocks 13 fixedly connected to the side wall of the mounting plate 1. The two side walls of the cover plate 8 are respectively rotatably connected to the fixing blocks 13, and a torsion spring 14 is arranged at the connection between the cover plate 8 and the fixing blocks 13.

[0040] Further, the moving assembly includes a motor 9 fixedly installed on the side wall of the detection chamber 2, and the motor 9 is directly opposite to the opening 3. The end of the output shaft of the motor 9 is axially connected with a lead screw 11. The free end of the lead screw 11 is rotatably connected to the inner side of the detection chamber 2. The inner bottom surface of the detection chamber 2 is fixed with a mounting frame 10 for guiding, and the lead screw 11 is located inside the mounting frame 10. A moving block 12 with a T-shaped cross-section is sleeved on the lead screw 11. The moving block 12 is fixed to the bottom of the push plate 4, and the moving block 12 is slidably connected to the inner side of the mounting frame 10. A plurality of slots 16 are arranged on the side wall and the bottom of the moving block 12, and rotatable balls 17 are arranged inside the slots 16. When the moving block 12 moves, this structure can reduce the friction during the moving process and ensure the smoothness of the movement.

[0041] Particularly importantly, when the push plate 4 moves into the detection chamber 2 and the radiation module is directly opposite to the placement groove 5, the distance between the irradiation unit of the radiation module and the push plate 4 is ≤ 2 mm. According to the formula that the irradiation dose is inversely proportional to the square of the distance, the equivalent irradiation of the low-dose irradiation of the source and the ordinary high-dose irradiation can be realized, so as to realize the normal operation of the thermoluminescence dating instrument. This can realize the extreme approach of the irradiation unit to the sample, increase the source dose rate, reduce the irradiation time to within 30 s, and reduce the attenuation rate to within 3%. The source used in the device is reduced to the exemption level, avoiding the trouble of the user handling the source.

[0042] During operation, the motor 9 is started. The rotation of the output shaft of the motor 9 drives the lead screw 11 to rotate. Under the guiding action of the mounting frame 10, the moving block 12 does not rotate with the rotation of the lead screw 11, but makes a horizontal movement. The movement of the moving block 12 drives the push plate 4 to move towards the opening 3. Subsequently, the push plate 4 can pass through the opening 3 and push the cover plate 8, causing the cover plate 8 to rotate, and then the placement groove 5 can move to the outside of the detection chamber 2. The staff places the sample in the placement groove 5. Similarly, under the action of the motor 9, the push plate 4 moves towards the inside of the detection chamber 2 until the placement groove 5 is directly opposite to the radiation module and the detection module. At this time, the cover plate 8 is reset under the action of the torsion spring 14 to achieve the light-shielding effect; Such a dating device has a simple structure. The push plate 4 can automatically pop out, which is convenient for the user to load the sample. The cover plate 8 can automatically open and close, realizing the timely light-shielding function, improving the reliability and stability of the detection data. Secondly, compared with the existing device, while being convenient to operate, the distance between the push plate 4 and the radiation source is minimized to increase the dose rate of the source.

[0043] Further, the specific dating steps are as follows: Step 1: Before any treatment, directly measure the thermoluminescence signal of the sample in its initial state. The detection module collects the data of the photodetectors in each channel and records the original dose S0. Step 2: The heating module heats the sample to release the energy stored in the sample, generating a thermoluminescence signal. The photodetectors in each channel record the number of photons released by the sample, which is the natural dose Sn. Step 3: Irradiate the sample with a known dose source (denoted as β) to simulate the first calibration process. Step 4: Further heat the sample to make it release all the stored energy. The photodetectors in each channel record the number of photons after the sample is completely extinguished, and the natural archaeological extinction dose SN is obtained. Step 5: Obtain the incremental calibration value SN + β after the first calibration. Step 6: Irradiate the sample again with a known dose source (denoted as 2β) to simulate the second calibration process. Step 7: The heating module performs microwave heating on the sample to release the energy stored in the sample. The photodetectors in each channel record the number of photons after the sample is completely extinguished, and the second calibration value SN + 2β is obtained. Step 8: The calibration processes of Step 6 and Step 7 can be repeated, gradually increasing the irradiation dose (3β, 4β...), and then determining the paleodose response curve of the sample and its relationship formula. According to the above dose response relationship formula, substitute the thermoluminescence signal Sn in the natural state into the curve equation to solve for the corresponding paleodose P.

[0044] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A thermoluminescence dating device using low-dose source irradiation, characterized in that, Comprising: Detection module: Adopting multi-channel detection technology, it is internally equipped with a photon detector for detecting and quantifying the number of photons released from the sample; Heating module: Heating the sample to be measured, releasing the energy stored in the sample, and generating a thermoluminescence signal; Radiation module: The radiation module is used to irradiate the sample, simulate the radiation conditions in the natural environment, and establish a dose response curve; Data acquisition and analysis module: Responsible for recording the signals from the detection module, processing and analyzing them, and finally calculating the age of the sample; Installation module: This module is used to place the sample to be measured and integrate other modules.

2. The thermoluminescence dating device using low-dose source irradiation according to claim 1, wherein The installation module includes: Detection chamber (2), a radiation source installation position (6) and a detection position (7) are provided at the top of the detection chamber (2), and the radiation source installation position (6) and the detection position (7) are respectively installed with a radiation module and a detection module; Installation plate (1), and the detection chamber (2) is installed on the installation plate (1); Push plate (4), arranged parallel to the inside of the detection chamber (2), and a placement groove (5) for installing the heating module is provided on the push plate (4); Opening (3), opened on the side wall of the detection chamber (2), and the opening (3) allows the push plate (4) to pass through; Cover plate (8), a connecting member is provided between the cover plate (8) and the installation plate (1), and the cover plate (8) corresponds to the opening (3) through the connecting member; Moving component, and the moving component is used to drive the push plate (4) to move.

3. A thermoluminescence dating device using low-dose source irradiation according to claim 2, characterized in that, The connecting member includes two fixing blocks (13) fixedly connected to the side wall of the installation plate (1), the two side walls of the cover plate (8) are respectively rotatably connected to the fixing blocks (13), and a torsion spring (14) is provided at the connection between the cover plate (8) and the fixing blocks (13).

4. A thermoluminescence dating device using low-dose source irradiation according to claim 3, characterized in that, The moving component includes a motor (9) fixedly installed on the side wall of the detection chamber (2), and the motor (9) is directly opposite to the opening (3). The end of the output shaft of the motor (9) is axially connected with a lead screw (11). The free end of the lead screw (11) is rotatably connected to the inner side of the detection chamber (2). An installation frame (10) for guiding is fixed on the inner bottom surface of the detection chamber (2), and the lead screw (11) is located inside the installation frame (10). A moving block (12) with a T-shaped cross-section is threadedly sleeved on the lead screw (11). The moving block (12) is fixed to the bottom of the push plate (4), and the moving block (12) is slidably connected to the inner side of the installation frame (10).

5. A thermoluminescence dating device using low-dose source irradiation according to claim 4, characterized in that, A plurality of slots (16) are provided on the side wall and the bottom of the moving block (12), and freely rotatable rotating balls (17) are arranged inside the slots (16).

6. The thermoluminescence dating device using low-dose source irradiation according to claim 5, characterized in that, The distance between the push plate (4) and the radiation unit of the radiation module is ≤ 2 mm.

7. A thermoluminescence dating device using low-dose source irradiation according to claim 1, characterized in that In the detection module, the photon detector is one of a multi-channel photomultiplier tube, an avalanche photodiode, and a superconducting nanowire detector.

8. A thermoluminescence dating device using low-dose source irradiation according to claim 1, characterized in that, In the detection module, a multifunctional quantum dot-graphene composite material is provided, and this composite material is used to enhance the detection sensitivity of the detector.

9. A thermoluminescence dating device using low-dose source irradiation according to claim 1, characterized in that, A heating element and a thermocouple array are arranged inside the heating module, and the heating element is a microwave generator.

10. A thermoluminescence dating device using low-dose source irradiation according to claim 1, characterized in that, A dynamic adjustment control mechanism is set in the data acquisition and analysis module to adjust the environmental conditions during the dating process. The dynamic adjustment control mechanism includes: Adaptive fuzzy PID control: Combining fuzzy logic and PID control to provide feedback regulation ability; Genetic algorithm optimized PID parameters: Finding the optimal solution by performing iterative selection, crossover, and mutation operations on the PID parameters; Online learning mechanism: Real-time monitoring of the system's performance indicators to optimize the control effect.

Images