Channel module of multi-channel PIPS low-background alpha and beta counter

Abstract

The invention relates to the field of nuclear radiation monitoring, and provides a channel module of a multi-channel PIPS low-background alpha and beta counter, which comprises a fixed copper assembly, a drawing plate assembly, a probe assembly and a linear guide rail. The fixed copper assembly is made of oxygen-free copper and forms a full-circumferential X-ray shielding layer together with the pulling plate disc, so that background noise is effectively reduced; the pulling plate assembly realizes stable movement of a sample through a linear guide rail, and when the sample reaches a detection position, a moving contact compresses a spring to trigger a position sensor and is linked with a self-locking mechanism to lock a pulling plate. The probe assembly comprises four groups of PIPS detectors which are distributed at equal intervals, supports synchronous detection of alpha and beta particles, is combined with a data fusion module, adopts a dynamic weight algorithm to calculate activity concentration, and is internally provided with a self-calibration program, so that the detection efficiency and the data reliability are remarkably improved. Through shielding optimization, accurate positioning, multi-channel cooperation and an intelligent algorithm, the problems of unstable sampling, low measurement efficiency and inaccurate data processing are solved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear radiation measurement, and particularly to a channel module of a multi-channel PIPS low-background α, β counter. Background Art

[0002] In the field of nuclear energy utilization, especially during the operation of a pressurized water reactor nuclear power plant, the breakage of the reactor coolant pipe is a safety hazard that cannot be ignored. When such an accident occurs, nuclear fission products will emit radioactive gaseous substances through facilities such as steam generators. These substances include, but are not limited to, aerosols, iodine, and inert gases. These radioactive gases are discharged into the atmosphere through the plant ventilation system, which not only causes radioactive pollution to the environment, but also, in the event of an accident, the leaked radioactive gaseous substances will be suspended in the surrounding air environment and enter the human body through breathing, forming serious internal irradiation and posing a great threat to the health of operators.

[0003] In addition, during the processing of nuclear fuel and nuclear waste, various radioactive hazardous gases and liquids will also be generated. In order to timely evaluate the impact of these radioactive substances on the surrounding environment and operators, strict radioactive monitoring must be carried out on them. Among them, α particles and β particles, as the main types of radioactive particles, are the key objects of monitoring. However, traditional radioactive monitoring equipment has many deficiencies in aspects such as sampling, measurement, and data processing, such as unstable sampling, low measurement efficiency, inaccurate data processing, etc. These problems seriously affect the accuracy and timeliness of radioactive monitoring.

[0004] Therefore, it is particularly important to develop a counter channel module that can smoothly take and deliver samples, has a self-locking protection function, can measure samples in multiple channels simultaneously, and can quickly calculate the α and β radioactive activity concentrations in the samples. Summary of the Invention

[0005] The purpose of the present invention is to provide a channel module of a multi-channel PIPS low-background α, β counter. This module adopts advanced PIPS detector technology and has a multi-channel independent or synchronous detection structure, which can simultaneously measure the α and β particle activity concentrations of multiple samples, greatly improving the measurement efficiency. This module also has the functions of smoothly taking and delivering samples and self-locking protection to ensure the accuracy and safety of measurement.

[0006] To solve the above technical problems, a channel module of a multi-channel PIPS low-background α, β counter of the present invention includes:

[0007] A fixed copper component, including a shielding structure composed of a limit front baffle and a spacer copper piece; the limit front baffle is fixed to the spacer copper piece and integrates a position sensor, a contact component, and a self-locking mechanism.

[0008] The extraction plate assembly is slidably connected to the fixed copper assembly through a linear guide rail, and includes an extraction plate frame and an extraction plate disk. A moving contact that cooperates with the slider of the linear guide rail is provided at the bottom.

[0009] The probe assembly is fixed to the fixed copper assembly and includes multiple groups of probes. The multiple groups of probes are equidistantly distributed along the direction of the linear guide rail to form a multi-channel independent or synchronous detection structure.

[0010] The linear guide rail is installed at the bottom of the fixed copper assembly and is connected to the extraction plate assembly through a slider to guide the linear translation of the extraction plate assembly.

[0011] Among them, the extraction plate disk and the fixed copper assembly form an X-ray shielding layer. When the extraction plate assembly moves to the detection position, the contact assembly contacts the position sensor to trigger a position signal and starts a self-locking mechanism to achieve self-locking.

[0012] In addition to the above technical features, the present invention has also been improved in the following aspects:

[0013] As a preferred technical solution of the present invention, the spacer copper piece includes a guide rail structure composed of spacer side coppers provided on both sides and a spacer copper provided between the spacer side coppers on both sides, and is used to define the movement path of the extraction plate assembly.

[0014] As a preferred technical solution of the present invention, the contact assembly is arranged at one end of the extraction plate frame close to the limit front stop, and includes a static contact, a moving contact, and a compression spring arranged between the moving contact and the static contact.

[0015] As a preferred technical solution of the present invention, when the sample reaches the detection position, the moving contact squeezes the compression spring to conduct with the static contact, triggering a self-locking signal.

[0016] As a preferred technical solution of the present invention, the self-locking mechanism includes a spring pressing lock and a locking head adapted to the spring pressing lock; the spring pressing lock is integrated inside the limit front stop, and the locking head is arranged at a position corresponding to the spring pressing lock on the extraction plate frame; the spring pressing lock includes a lock catch mechanism driven by a compression spring to lock the relative position of the extraction plate assembly and the fixed copper assembly after the position signal is triggered.

[0017] As a preferred technical solution of the present invention, a limit PCB board is arranged inside the limit front stop and is electrically connected to the position sensor, and is used to process the contact signal and control the opening and closing of the spring pressing lock.

[0018] As a preferred technical solution of the present invention, the probe assembly includes multiple independently arranged PIPS detectors to form a multi-channel synchronous detection structure. The PIPS detectors are equidistant and parallel to the movement direction of the extraction plate.

[0019] As a preferred technical solution of the present invention, the four-channel probe assembly includes: a detector and a preamplifier.

[0020] As a preferred technical solution of the present invention, the channel module of the multi-channel PIPS low-background α, β counter further includes a data fusion module, which:

[0021] The input interface is connected to the four-channel probe;

[0022] The processing unit uses FPGA to achieve real-time data fusion;

[0023] The output end provides the calculation formulas for α and β activity concentrations:

[0024]

[0025] where W i is the weight coefficient of the i-th channel, N i is the count, and T is the measurement time.

[0026] As a preferred technical solution of the present invention, the data fusion module is built-in with a self-calibration program, which automatically triggers the calibration process when the deviation of the four-channel measurement value > 15%.

[0027] The channel module of the multi-channel PIPS low-background α, β counter provided by the present invention brings significant technical improvements and practical application effects compared with the traditional radioactive detection probe module, which are specifically manifested in the following aspects:

[0028] 1. Multi-channel synchronous measurement and efficiency optimization:

[0029] The channel module is designed with four groups of PIPS probe assemblies, which can simultaneously or independently measure the activities of α and β particles of multiple samples. The measurement efficiency is increased by 4 times compared with the single channel, significantly improving the measurement efficiency and shortening the detection time.

[0030] The probe assemblies are equally spaced along the linear guide rail direction, ensuring the accuracy and consistency of the measurement.

[0031] 2. Precise sample positioning and self-locking protection:

[0032] Through the cooperation of the contact component and the position sensor, when the sample reaches the detection position, the moving contact compresses the spring to trigger the position sensor, automatically triggering the position signal and starting the self-locking mechanism to achieve self-locking, eliminating the displacement deviation caused by mechanical vibration or operation error, and avoiding the measurement deviation caused by sample shaking.

[0033] The self-locking mechanism uses the cooperation of a spring pressing lock and a locking head to ensure the relative position stability of the draw plate assembly and the fixed copper assembly, improving the stability and reliability of the measurement.

[0034] 3. High-efficiency X-ray shielding and low background noise

[0035] By using oxygen-free copper material to construct the closed shielding layer of the fixed copper component and the extraction plate disk, it effectively blocks the interference of external X-rays, improves the shielding efficiency to ≥98%, significantly reduces the background radiation noise, and ensures the high-sensitivity detection of α and β particles.

[0036] The guide rail structure composed of spaced copper parts not only defines the movement path of the extraction plate component, but also further enhances the shielding effect.

[0037] 4. Intelligent data fusion and processing:

[0038] This channel module is equipped with a data fusion module, which uses FPGA to achieve real-time data fusion and can quickly calculate the α and β radioactivity concentration in the sample.

[0039] The data fusion module also has a built-in self-calibration program. When the deviation of the multi-channel measurement value exceeds 15%, it will automatically trigger the calibration process to ensure the accuracy and reliability of the measurement results.

[0040] 5. Modular design and operational convenience

[0041] The extraction plate component realizes smooth translation through a linear guide rail. The non-loosening screw fixing method is convenient for probe maintenance. The overall structure is compact, suitable for the complex environment of the nuclear industry, and reduces the maintenance cost.

[0042] In summary, the channel module of the multi-channel PIPS low-background α and β counter of the present invention has achieved remarkable technical effects in improving measurement efficiency, ensuring measurement accuracy, enhancing X-ray shielding performance, realizing intelligent data fusion and processing, and facilitating operation and maintenance. It has a wide application prospect in the fields of nuclear power plants, nuclear fuel and nuclear waste treatment, etc., can realize real-time monitoring and rapid evaluation of radioactive substances, and provides strong technical support for nuclear safety. Description of the Drawings

[0043] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0044] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0045] Figure 2 It is a schematic diagram of the internal structure of the present invention after removing part of the housing;

[0046] Figure 3 It is Figure 2 The partial enlarged view of A in

[0047] Figure 4 It is a schematic structural diagram of the drawer plate assembly in the present invention;

[0048] Figure 5 It is an exploded view of the drawer plate assembly in the present invention.

[0049] The reference numerals in the figure are as follows:

[0050] 1. Fixed copper assembly; 101. Drawer plate fixed copper; 102. Spacing side copper; 103. Spacing copper; 104. Limit front baffle; 105. Limit PCB board; 2. Drawer plate assembly; 201. Drawer plate tray; 202. Sample tray; 203. Drawer plate frame; 204. Contact assembly; 214. Moving contact; 224. Static contact; 234. Compression spring; 205. Locking head; 3. Probe assembly; 4. Linear guide rail; 5. Position sensor. Detailed implementation manners

[0051] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present invention and its application or use. The present invention can be implemented in other different forms and is not limited to the embodiments described herein.

[0052] I. Explanation of the descriptive terms in the present invention

[0053] The embodiments given in combination with the technical solutions of the present invention are to make the present invention more thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that: unless specifically stated otherwise in the present invention, the relative arrangements of the components described in these embodiments should be construed as merely exemplary and not as a limitation to the technical solutions of the present invention.

[0054] In the present invention, if directional terms such as "upper", "lower", "left", "right", "bottom", "top", etc. are involved, they are defined relative to the directions in the respective drawings and are only used to represent the relative positional relationship. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. These or other directional terms should not be construed as restrictive terms.

[0055] In the present invention, the similar terms such as "a", "an", "one kind", "the", etc. do not represent a quantity limitation and can represent singular or plural. The terms "including", "comprising", "having" and any variations thereof involved in the present invention are intended to cover non-exclusive inclusion; if the terms "first", "second", "third", etc. are involved in the present invention, they are only used to distinguish similar objects and do not represent a specific order for the objects.

[0056] In the present invention, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0057] In addition, the present invention does not discuss in detail the technologies and devices known to those of ordinary skill in the relevant fields, but under appropriate circumstances, the said technologies and devices should be regarded as part of the specification.

[0058] II. Core Technical Problems to be Solved by the Technical Solution of the Present Application

[0059] In the field of nuclear energy utilization, especially during the operation of a pressurized water reactor nuclear power plant, accidents such as the breakage of reactor coolant pipes will release radioactive gaseous substances, such as aerosols, iodine, and inert gases. These substances are discharged into the atmosphere through the ventilation system, causing environmental pollution and posing a threat to human health.

[0060] At the same time, radioactive gases and liquids are also generated during the processing of nuclear fuel and nuclear waste. To evaluate the impact of these radioactive substances, strict radioactive monitoring is required, and radioactive particles such as alpha particles and beta particles are the key monitoring targets.

[0061] However, traditional radioactive monitoring equipment has significant deficiencies in sampling, measurement, and data processing. Unstable phenomena often occur during the sampling process, resulting in poor representativeness of the samples; the measurement efficiency is low, and monitoring data cannot be obtained in a timely manner; the data processing is inaccurate, affecting the reliability of the monitoring results. These problems seriously restrict the accuracy and timeliness of radioactive monitoring.

[0062] III. Based on the above problems, the present invention specifically provides a technical solution to solve the above problems. The technical solution of the present application will be described in detail below in combination with specific embodiments.

[0063] As Figures 1-5 shown, the present invention provides a channel module applied to a multi-channel PIPS low-background alpha and beta counter. The technical solution of the present invention will be described in detail below in combination with specific embodiments and drawings.

[0064] A channel module of the present invention applied to a multi-channel PIPS low-background alpha and beta counter mainly includes four major parts: a fixed copper component 1, a drawer component 2, a probe component 3, and a linear guide 4.

[0065] 1. Fixed copper component 1:

[0066] The fixed copper component 1 serves as the basic structure of the entire module. The main base material is made of oxygen-free copper to shield some of the derived X-rays and reduce measurement interference.

[0067] The fixed copper component 1 includes structural components such as a limit front baffle 104 and a spacer copper 03 piece (composed of a spacer side copper 02 and a spacer copper 03, used to define the movement path of the extraction plate component 2).

[0068] The limit front baffle 104 and the spacer copper 03 piece are fastened by a cross-recessed pan head screw M3×6 to form a stable shielding structure.

[0069] The limit front baffle 104 internally integrates a position sensor 5, a contact component 204 (including a static contact 224, a moving contact 214, and a compression spring 234), and a self-locking mechanism (a spring pressing lock and a locking head 205).

[0070] The limit PCB board 105 is installed inside the limit front baffle 104 and is electrically connected to the position sensor 5, used to process the contact signal and control the opening and closing of the spring pressing lock.

[0071] 2. Extraction plate component 2:

[0072] The extraction plate component 2 is used to move the sample to be measured and mainly consists of an extraction plate frame 203 and an extraction plate disk 201.

[0073] The extraction plate frame 203 is treated with black anodizing of aluminum alloy, which is beautiful and light-shielding.

[0074] The extraction plate disk 201 is made of oxygen-free copper and jointly forms an X-ray shielding layer with the fixed copper component 1.

[0075] The bottom of the extraction plate component 2 fixes the slider of the linear guide 4 through a cross-recessed screw M3x6, enabling it to move smoothly on the linear guide 4.

[0076] The moving contact 214 is arranged at one end of the extraction plate frame 203 close to the limit front baffle 104 and cooperates with the static contact 224 and the compression spring 234 to trigger the position signal.

[0077] 3. Probe component 3:

[0078] The probe component 3 contains multiple independently set PIPS detectors, which are evenly distributed along the direction of the linear guide 4 to form a four-channel independent or synchronous detection structure.

[0079] The spacing between each PIPS detector is equal and parallel to the movement direction of the extraction plate component 2, ensuring the uniformity and consistency of the measurement.

[0080] The probe component 3 also includes an alpha particle detector, a beta particle detector, and a preamplifier, used to detect and amplify radioactive particles.

[0081] 4. Linear guide rail 4:

[0082] The linear guide rail 4 is installed at the bottom of the fixed copper component 1 and is connected to the drawplate component 2 through a slider to guide the linear translation of the drawplate component 2.

[0083] IV. Technical scenario application and assembly steps description

[0084] To clearly illustrate this application, the technical solution of the present invention will be described in detail below in combination with specific application scenarios:

[0085] (I) Description of core components

[0086] 1. Fixed copper component 1: Made of oxygen-free copper (purity ≥ 99.95%), including a limit front baffle 104, a spacer side copper 102, a spacer copper 03, a spacer side copper 102, fixed by cross-recessed pan head screws (M3×6), and internally integrated with a position sensor 5 (photoelectric type, wavelength 850 ± 10 nm), a contact component 204, and a spring pressing lock (HFW31-22.5 type).

[0087] 2. Drawplate component 2: Includes a drawplate frame 203 (6061 aluminum alloy, black anodized treatment, film thickness 20 - 25 μm) and a drawplate disk 201 (oxygen-free copper, thickness 4 ± 0.2 mm), and the bottom is connected to the linear guide rail 4 (stroke 200 ± 0.5 mm, sliding accuracy ± 0.05 mm) through a slider (surface plated with hard chromium, thickness ≥ 5 μm).

[0088] 3. Probe component 3: Four groups of PIPS detectors (α detector: thickness 100 ± 5 μm; β detector: thickness 500 ± 10 μm), fixed to the fixed copper component 1 equidistantly (spacing 50 ± 0.5 mm) by non-loosening screws (M3×8, pre-tightening torque 0.6 N·m).

[0089] 4. Data fusion module: Integrated with an FPGA chip (Xilinx XC7K325T), the input interface is of BNC type (impedance 50 Ω), and the output activity concentration calculation formula:

[0090]

[0091] Where Wi is the dynamic weight coefficient (range 0.20 - 0.30), Ni is the count of each channel, and T is the measurement time.

[0092] (II) Assembly steps

[0093] 1. Assembly of the fixed copper component 1

[0094] Fix the spacer side copper 102 one, spacer copper 103, and spacer side copper 102 two with screws to form a drawplate movement channel with a width of 25 ± 0.1 mm.

[0095] Install a limit PCB board 105 (made of FR-4 material with a thickness of 1.6 mm) inside the limit front baffle 104, integrating a signal conditioning circuit (sampling rate of 1 kHz) and a control logic unit.

[0096] Insert the spring pressing lock into the cavity of the limit front baffle 104. The lock catch (made of 60Si2MnA spring steel) and the pressure spring (free length of 15 mm, compression amount of 3 mm) are coaxially installed, and the locking force ≥ 15 N.

[0097] 2. Installation of the drawplate assembly 2

[0098] Fix the oxygen-free copper drawplate disk 201 and the aluminum alloy drawplate frame 203 with screws to ensure that the surface roughness Ra ≤ 0.8 μm (polishing treatment).

[0099] Install a moving contact 214 (made of brass, contact resistance ≤ 10 mΩ) at the end of the drawplate frame 203, and connect the bottom to the slider of the linear guide 4 (friction coefficient ≤ 0.003).

[0100] The gap between the drawplate disk 201 and the fixed copper assembly 1 ≤ 0.05 mm, forming a circumferential X-ray shielding layer (shielding efficiency ≥ 98%).

[0101] 3. Arrangement of the probe assembly 3

[0102] Four groups of PIPS detectors are installed equidistantly along the direction of the linear guide 4. The normal direction of the detector is inclined at an angle of 15° to the drawplate plane to optimize the particle reception efficiency.

[0103] The preamplifier (noise figure ≤ 2 dB) is directly integrated at the rear end of the detector and connected to the data fusion module through a shielded cable.

[0104] 4. Integration of the data fusion module

[0105] The FPGA chip configures a real-time data fusion algorithm to dynamically calculate the weights of each channel:

[0106]

[0107] where Si is the signal-to-noise ratio.

[0108] The self-calibration program sets a deviation threshold of 15%. When the standard deviation of the four-channel measurement values > 15%, the abnormal channel is automatically disabled and the weights are reconstructed.

[0109] V. Explanation of the working principle

[0110] Combined with the innovative design of the above technical solutions, the four-channel PIPS low-background α, β counter channel module realizes the efficient and accurate measurement of radioactive samples through mechanical linkage, shielding protection, multi-channel collaborative detection and intelligent data processing. The specific working principle of this application is as follows:

[0111] (I) Sample Loading and Positioning

[0112] 1. Manually push in the extraction plate

[0113] The operator places the sample to be measured on the extraction plate tray 201 and manually pushes the extraction plate assembly 2 along the linear guide rail 4 (travel 200 ± 0.5 mm). The slider at the bottom of the extraction plate (coefficient of friction ≤ 0.003) ensures smooth sliding.

[0114] 2. Trigger the position signal

[0115] When the extraction plate moves to the detection position, the moving contact 214 (made of brass) at the end of the extraction plate frame 203 compresses the compression spring 234 (stiffness coefficient 8 N / mm) and contacts and conducts with the static contact 224 in the limit front stop 104, generating a voltage jump signal (≥ 3 V, response time < 10 ms).

[0116] 3. Start the self-locking mechanism

[0117] The position signal is transmitted to the self-locking mechanism through the signal conditioning circuit (sampling rate 1 kHz) of the limit PCB board 105. The spring-pressed lock (locking force ≥ 15 N) drives the lock catch to insert into the lock hole of the extraction plate frame 203, locking the position of the extraction plate and eliminating the displacement deviation caused by mechanical vibration (positioning repeatability error ≤ 0.1 mm).

[0118] (II) X-ray Shielding and Low-background Environment Construction

[0119] 1. Close the shielding layer

[0120] The extraction plate tray (oxygen-free copper, thickness 4 ± 0.2 mm) fits tightly with the limit front stop and the spacer copper part of the fixed copper assembly to form a full circumferential closed shielding structure (gap ≤ 0.05 mm), with a shielding efficiency ≥ 98%, effectively blocking external X-rays and electromagnetic interference.

[0121] 2. Suppress the background noise

[0122] The high purity (≥ 99.95%) of oxygen-free copper and the surface polishing treatment (Ra ≤ 0.8 μm) reduce the scattering effect, reducing the background noise by 30% and increasing the detection sensitivity to 0.1 Bq / m 3 。

[0123] (III) Multi-channel Particle Synchronous Detection

[0124] 1. Detector layout

[0125] Four groups of PIPS detectors (α: 100-μm-thick chip; β: 500-μm-thick chip) are arranged in parallel at equal intervals of 50 ± 0.5 mm, with the normal direction inclined at 15° to the plane of the extraction plate to optimize the particle reception efficiency.

[0126] 2. Signal acquisition and amplification

[0127] After α and β particles penetrate the sample, they are captured by the corresponding detectors respectively, generating electrical pulse signals. The preamplifier (noise factor ≤ 2 dB, bandwidth 10 MHz) amplifies the signals and transmits them to the data fusion module.

[0128] (IV) Data fusion and activity calculation

[0129] 1. Dynamic weight assignment

[0130] The data fusion module (FPGA chip Xilinx XC7K325T) analyzes the signal-to-noise ratio Si of each channel in real time and dynamically assigns weight coefficients (range 0.20 - 0.30) according to the formula

[0131] 2. Activity concentration calculation

[0132] The weighted average algorithm is used to integrate the data of the four channels and output the activity concentration:

[0133]

[0134] (V) X-ray shielding and low-background environment construction

[0135] 1. Closed shielding layer

[0136] The extraction plate disk 201201201 (oxygen-free copper, thickness 4 ± 0.2 mm) fits tightly with the limit front stop 104104104 and the spacer copper 103103103 parts of the fixed copper component 111 to form a circumferentially closed shielding structure (gap ≤ 0.05 mm), with a shielding efficiency ≥ 98%, effectively blocking external X-rays and electromagnetic interference.

[0137] 2. Background noise suppression

[0138] The high purity (≥ 99.95%) of oxygen-free copper and the surface polishing treatment (Ra ≤ 0.8 μm) reduce the scattering effect, reducing the background noise by 30% and increasing the detection sensitivity to 0.1 Bq / m 3 .

[0139] where Ni is the channel count and T is the measurement time, and the calculation result error < 5%.

[0140] 3. Self-calibration mechanism

[0141] ​If the standard deviation of the four-channel measurement value > 15%, the system automatically disables the abnormal channel, reconstructs the weight coefficient according to the remaining channels, and completes the calibration within 30 seconds.

[0142] (6) Abnormal handling and safety guarantee

[0143] 1. Mechanical protection

[0144] The self-locking mechanism prevents the accidental displacement of the extraction plate, ensuring the accurate alignment of the detector and the sample.

[0145] 2. Data reliability

[0146] The self-calibration program avoids misjudgment caused by single-channel faults or environmental interference, ensuring long-term detection stability.

[0147] VI. The specific operation process of this application is as follows:

[0148] (1) Sample placement and detection:

[0149] The operator pushes the extraction plate assembly 2 by hand to move the sample to be measured to the detection position.

[0150] When the sample is in place, the moving contact 214 squeezes the compression spring 234 to conduct with the static contact 224, triggering a position signal.

[0151] The position signal is transmitted to the limit PCB board 105 for processing, and controls the spring pressing lock to start the self-locking mechanism to realize the relative position locking of the extraction plate assembly 2 and the fixed copper assembly 1.

[0152] (2) Data measurement and fusion:

[0153] When the sample is in the detection position, the four-channel PIPS detector simultaneously measures the activity of α and β particles of the sample.

[0154] The measurement data is amplified by the preamplifier and then transmitted to the data fusion module.

[0155] The data fusion module uses FPGA to realize real-time data fusion, and calculates the α and β radioactive activity concentrations in the sample according to the preset calculation formulas of α and β activity concentrations (where Wi is the weight coefficient of the i-th channel).

[0156] (3) Automatic calibration and maintenance:

[0157] The data fusion module has a built-in self-calibration program, which automatically triggers the calibration process regularly or when the deviation of the multi-channel measurement value exceeds 15% to ensure the accuracy of the measurement results.

[0158] The module design is convenient for disassembly and maintenance, and the operator can replace or clean the components as needed.

[0159] In summary, through precise mechanical design (self-locking + guide rail), material shielding optimization (oxygen-free copper), multi-channel collaborative detection (PIPS detector), and intelligent algorithms (dynamic weight + self-calibration), this module achieves efficient, low-background, and high-precision measurement of radioactive samples, and is applicable to scenarios such as nuclear power plant accident emergency monitoring and nuclear waste treatment. The comprehensive detection efficiency is increased by 4 times compared with the traditional single-channel system.

[0160] VII. Application Prospects

[0161] A channel module of the present invention applied to a multi-channel PIPS low-background α, β counter has the advantages of compact structure, accurate measurement, and easy operation, and is particularly suitable for monitoring radioactive gaseous substances when the coolant pipeline of a nuclear power plant reactor is damaged, and for evaluating the radioactive hazards generated during the processing of nuclear fuel and nuclear waste.

[0162] VIII. Summary

[0163] A channel module of the present invention applied to a multi-channel PIPS low-background α, β counter realizes functions such as stable sample loading and unloading, multi-channel synchronous detection, and rapid calculation of radioactive activity concentration of radioactive substances through the composition and assembly of carefully designed components and efficient working principles and operation processes, providing strong technical support for radioactive monitoring in fields such as nuclear power plants, nuclear fuel, and nuclear waste treatment.

[0164] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A channel module of a multi-channel PIPS low-background α, β counter, characterized in that, Comprising: A fixed copper component (1), including a shielding structure composed of a limit front baffle (104) and a spaced copper (103) component; the limit front baffle (104) is fixed to the spaced copper (103) component and integrates a position sensor (5), a contact component (204) and a self-locking mechanism; A draw plate component (2), slidably connected to the fixed copper component (1) through a linear guide rail (4), including a draw plate frame (203) and a draw plate disc (201), and a moving contact (214) is provided at the bottom for mating with the slider of the linear guide rail (4); A probe component (3), fixed to the fixed copper component (1), including multiple groups of probes, and the multiple groups of probes are equally spaced along the direction of the linear guide rail (4); A linear guide rail (4), installed at the bottom of the fixed copper component (1), connected to the draw plate component (2) through a slider, and guiding the linear translation of the draw plate component (2); Wherein, the draw plate disc (201) and the fixed copper component (1) form an X-ray shielding layer. When the draw plate component (2) moves to the detection position, the contact component (204) contacts the position sensor (5) to trigger a position signal, and the self-locking mechanism is activated to achieve self-locking.

2. The channel module of the multi-channel PIPS low-background α, β counter according to claim 1, characterized in that, The spaced copper (103) component includes a guide rail structure composed of spaced side coppers (102) provided on both sides and a spaced copper (103) provided between the spaced side coppers (102) on both sides, for limiting the movement path of the draw plate component (2).

3. The channel module of the multi-channel PIPS low-background α, β counter according to claim 1, characterized in that, The contact component (204) is arranged at one end of the draw plate frame (203) close to the limit front baffle (104), and includes a static contact (224), a moving contact (214) and a compression spring (234) arranged between the moving contact (214) and the static contact (224).

4. The channel module of the multi-channel PIPS low-background α, β counter according to claim 3, characterized in that, The position sensor (5) is correspondingly arranged with the contact component (204); when the sample reaches the detection position, the moving contact (214) squeezes the compression spring (234) to conduct with the static contact (224), triggering a self-locking signal.

5. The channel module of the multi-channel PIPS low-background α, β counter according to claim 1, characterized in that, The self-locking mechanism includes a spring pressing lock and a locking head (205) adapted to the spring pressing lock; the spring pressing lock is integrated inside the limit front baffle (104), and the locking head (205) is arranged at a position corresponding to the spring pressing lock on the draw plate frame (203); the spring pressing lock includes a lock mechanism driven by a compression spring (234), and locks the relative position of the draw plate component (2) and the fixed copper component (1) after the position signal is triggered.

6. The channel module of the multi-channel PIPS low-background α, β counter according to claim 1, characterized in that, A limit PCB board (105) is arranged inside the limit front baffle (104), electrically connected to the position sensor (5), and used for processing contact signals and controlling the opening and closing of the spring pressing lock.

7. The channel module of the multi-channel PIPS low-background α, β counter according to claim 1, characterized in that, The probe component (3) includes multiple independently arranged PIPS detectors, and the PIPS detectors are equally spaced and parallel to the movement direction of the draw plate component (2).

8. The channel module of the multi-channel PIPS low-background α, β counter according to claim 1, characterized in that, It is characterized in that The four-channel probe component (3) includes: a detector and a preamplifier.

9. The channel module of the multi-channel PIPS low-background α, β counter according to claim 1, characterized in that It further includes a data fusion module, which: The input interface is connected to multi-channel probes; The processing unit uses FPGA to achieve real-time data fusion; The output end provides calculation formulas for α and β activity concentrations: Wherein, Wi is the weight coefficient of the i-th channel, Ni is the count, and T is the measurement time.

10. The channel module of the multi-channel PIPS low-background α, β counter according to claim 9, characterized in that, The data fusion module is built-in with a self-calibration program, which automatically triggers the calibration process when the deviation of multi-channel measurement values > 15%.

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