Radiation detection device and method for measuring ultra-wide-range gamma rays

Abstract

The invention provides a radiation detection device and method for measuring ultra-wide-range gamma rays, and relates to the technical field of radiation detection.The radiation detection device comprises a detection assembly, a radiation shielding assembly and a signal processing assembly, and the signal processing assembly is located in the radiation shielding assembly; the detection assembly comprises three GM counting tubes with different measuring ranges and an acquisition circuit, and the acquisition circuit is used for converting signals output by the GM counting tubes into voltage counting signals; the signal processing assembly comprises a high-voltage control circuit, a power supply processing circuit, a pre-amplification circuit and a processor, the power supply processing circuit is used for converting a direct-current power supply signal and then transmitting the converted direct-current power supply signal to the high-voltage control circuit and the acquisition circuit, and the high-voltage control circuit is used for outputting a high-voltage power supply signal to each GM counting tube; the pre-amplification circuit is used for filtering and amplifying the voltage counting signals, and the processor is used for determining a target radiation dose rate according to the processed voltage signals. The radiation detection device provided by the invention has a relatively wide measuring range and relatively high measurement precision.

Description

Technical Field

[0001] The present application relates to the field of radiation detection technology, and in particular to a radiation detection device and method for measuring ultra-wide range gamma rays. Background Art

[0002] At present, in the field of radiation detection, there are many types of detectors that can detect gamma rays. In order to expand the gamma dose rate range of the detector, a combination of multiple different detectors or the same detector with different ranges can be used for measurement to meet the requirements of low measurement error.

[0003] However, in actual applications, ultra-high radiation dose rates such as 50Gy / h will cause immediate effects and cumulative damage to the internal circuit components of the gamma-ray detector, such as causing the logic gate circuit to be inverted, the op amp output signal to be biased, the op amp open-loop gain to decrease, the MOS tube threshold voltage to decrease, and other adverse effects, thereby affecting the actual measurement accuracy. Summary of the Invention

[0004] In view of this, the present application proposes a radiation detection device and method for measuring ultra-wide range gamma rays.

[0005] In a first aspect, the present application provides a radiation detection device for measuring ultra-wide range gamma rays, comprising: a detection component, a radiation shielding component, and a signal processing component, wherein the signal processing component is located within the radiation shielding component; The detection assembly includes a first GM counter tube, a second GM counter tube, a third GM counter tube, and an acquisition circuit. The upper range limit of the first GM counter tube is smaller than the upper range limit of the second GM counter tube, and the upper range limit of the second GM counter tube is smaller than the upper range limit of the third GM counter tube. The acquisition circuit is used to convert the current pulse signal output by each GM counter tube into a voltage counting signal. The signal processing component includes a high-voltage control circuit, a power processing circuit, a preamplifier circuit and a processor. The power processing circuit is used to convert the received DC power signal, transmit the stepped-down signal to the processor, and transmit the boosted signal to the high-voltage control circuit and the acquisition circuit respectively. The high-voltage control circuit is used to output a high-voltage power signal based on the boost signal to supply each GM counter tube. The preamplifier circuit is used to filter and amplify each of the voltage counting signals. The processor is used to determine the target radiation dose rate based on the processed voltage signal, and control the high-voltage power signal output by the high-voltage control circuit according to the target radiation dose rate to control the working state of each GM counter tube.

[0006] In one embodiment, the processor is further used to: determine a target range mode according to the target radiation dose rate and preset range switching thresholds, and control the working state of each GM counter tube according to the target range mode to switch to the target range mode.

[0007] In one embodiment, the processor is further configured to obtain a target GM counter corresponding to the target range mode, and update the target radiation dose rate according to a measurement value of the target GM counter.

[0008] In one embodiment, the initial range mode of the radiation detection device is a low range mode, and each GM counter tube is in a working state; When the processor determines that the target range mode is the mid-range mode, the processor controls the high-voltage control circuit to stop supplying the high-voltage power supply signal to the first GM counter tube; When determining that the target range mode is the high range mode, the processor controls the high-voltage control circuit to stop supplying the high-voltage power supply signal to the first GM counter tube and the second GM counter tube respectively.

[0009] In one embodiment, the processor is also used to: obtain the target radiation dose rate detected multiple times within a predetermined time period, determine the comparison results of the target radiation dose rate detected multiple times and the switching thresholds of each range, and when the comparison results are consistent, determine the target range mode based on the comparison results and the range priority corresponding to the current range mode.

[0010] In one embodiment, the low-medium-range switching threshold corresponding to switching from low-range mode to medium-range mode is greater than the medium-low-range switching threshold corresponding to switching from medium-range mode to low-range mode; the medium-high-range switching threshold corresponding to switching from medium-range mode to high-range mode is greater than the high-medium-range switching threshold corresponding to switching from high-range mode to medium-range mode.

[0011] In one embodiment, the signal processing component further includes: an ADC sampling circuit, which is used to sample the signal output by the high-voltage control circuit and generate a sampling signal to the processor based on the sampling result. The processor is used to determine the actual working status of each GM counter tube based on the sampling signal.

[0012] In one embodiment, the processor is further configured to: enter a first intermediate state after determining that the high-range mode is shifted to the mid-range mode or the low-range mode, determine a target radiation dose rate in the first intermediate state as a product of a measurement value of the third GM counter tube and a preset first attenuation coefficient, and end the first intermediate state when determining, based on the sampling signal, that the second GM counter tube is operating; After determining that the mid-range mode is transferred to the low-range mode, the second intermediate state is entered, and the target radiation dose rate of the second intermediate state is determined as the product of the measurement value of the second GM counter tube and the preset second attenuation coefficient. When it is determined that the first GM counter tube is working according to the sampling signal, the second intermediate state is ended; wherein, the attenuation coefficient continues to decay per second.

[0013] In one embodiment, the acquisition circuit includes: three acquisition sub-circuits, the three acquisition sub-circuits are respectively connected between three GM counter tubes and a common ground, and the three acquisition sub-circuits respectively include resistors and capacitors connected in parallel.

[0014] In a second aspect, the present application further provides a radiation detection method for measuring ultra-wide range gamma rays, which is applied to the radiation detection device as described in the first aspect; the radiation detection method comprises: Obtain target radiation dose rate; Determining a target range mode according to the target radiation dose rate and preset switching thresholds for each range; The working state of each GM counter tube is controlled according to the target range mode to switch to the target range mode.

[0015] The radiation detection device for measuring ultra-wide range gamma rays of the present application has the following beneficial effects compared to the related art: 1. This application detects external radiation conditions through a detection component, converts the detected current pulse signal into a voltage count signal, and transmits it to a signal processing component. Based on the received voltage count signal, the signal processing component can determine the target radiation dose rate and achieve radiation detection. In this process, the signal processing component is located within a radiation shielding component, which shields external radiation interference, making the radiation interference to the signal processing component very low. This can effectively reduce the immediate effects and cumulative damage to the internal circuit components of the signal processing component under high radiation dose rates, improve the radiation interference resistance of the signal processing component, and thus improve measurement accuracy.

[0016] 2. In this application, the detection component includes three GM counter tubes with different ranges. The processor can determine the target radiation dose rate based on the processed voltage signal, and control the high-voltage power supply signal output by the high-voltage control circuit according to the target radiation dose rate to control the working state of each GM counter tube. Therefore, during the measurement process, each GM counter tube can operate at an appropriate high voltage value, and the lower range counter tube can be overload protected, which is beneficial to improving the reliability and service life of the radiation detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the structure of a radiation detection device for measuring ultra-wide range gamma rays in one embodiment of the present application; Figure 2 This is a schematic structural diagram of a radiation detection device for measuring ultra-wide range gamma rays in another embodiment of the present application; Figure 3 Schematic diagram of a flow chart of a radiation detection method for measuring ultra-wide range gamma rays in one embodiment of the present application.

[0019] Description of reference numerals: 1-Detection component, 11-First GM counter tube, 12-Second GM counter tube, 13-Third GM counter tube, 14-Acquisition circuit, 2-Radiation shielding component, 3-Signal processing component, 31-High voltage control circuit, 32-Power processing circuit, 33-Preamplifier circuit, 34-Processor, 35-ADC sampling circuit. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0022] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0023] As described in the background technology, currently, in the field of radiation detection, there are many types of detectors that can detect gamma rays. In order to expand the gamma dose rate range of the detector, a combination of multiple different detectors or different ranges of the same detector can be used for measurement to meet the requirements of low measurement error.

[0024] However, in actual applications, ultra-high radiation dose rates such as 50Gy / h will cause immediate effects and cumulative damage to the internal circuit components of the gamma-ray detector, such as causing the logic gate circuit to be inverted, the op amp output signal to be biased, the op amp open-loop gain to decrease, the MOS tube threshold voltage to decrease, and other adverse effects, thereby affecting the actual measurement accuracy.

[0025] Based on this, in some embodiments, such as Figure 1 As shown, the present application provides a radiation detection device for measuring ultra-wide range gamma rays, comprising: a detection component 1, a radiation shielding component 2 and a signal processing component 3, wherein the signal processing component 3 is located inside the radiation shielding component 2.

[0026] The detection component 1 includes a first GM counter tube 11, a second GM counter tube 12, a third GM counter tube 13 and an acquisition circuit 14. The upper range limit of the first GM counter tube 11 is smaller than the upper range limit of the second GM counter tube 12, and the upper range limit of the second GM counter tube 12 is smaller than the upper range limit of the third GM counter tube 13. The acquisition circuit 14 is used to convert the current pulse signals output by each GM counter tube into voltage counting signals respectively.

[0027] A GM counter, also known as a Geiger-Müller counter (GM), is a counting instrument specifically designed to detect the intensity of ionizing radiation (alpha particles, beta particles, gamma rays, and X-rays). It consists of a gas-filled tube or chamber serving as a probe. When the voltage applied to the probe reaches a certain range, each pair of ions generated by the radiation within the tube is amplified to produce an electrical pulse of the same magnitude, which is converted into a voltage signal by the connected acquisition circuit.

[0028] It can be understood that the detection range of the detection assembly 1 is the combined range of the first GM counter tube 11, the second GM counter tube 12, and the third GM counter tube 13. The lower limit of the detection range of the detection assembly 1 is the lower limit of the detection of the first GM counter tube 11, and the upper limit of the detection range of the detection assembly 1 is the upper limit of the detection of the third GM counter tube 13. For example, if the low-range range of the first GM counter tube 11 is 0.1 uGy / h-10 mGy / h, the mid-range range of the second GM counter tube 12 is 0.1 mGy / h-10 GY / h, and the high-range range of the third GM counter tube 13 is 10 mGy / h-100 Gy / h, then the detection range of the detection assembly 1 is 0.1 uGy / h-100 Gy / h.

[0029] The signal processing component 3 includes a high-voltage control circuit 31, a power processing circuit 32, a preamplifier circuit 33 and a processor 34. The power processing circuit 32 is used to convert the received DC power signal, transmit the stepped-down signal to the processor 34, and transmit the boosted signal to the high-voltage control circuit 31 and the acquisition circuit 14 respectively. The high-voltage control circuit 31 is used to output a high-voltage power signal based on the boost signal to each GM counter tube. The preamplifier circuit 33 is used to filter and amplify each voltage counting signal. The processor 34 is used to determine the target radiation dose rate based on the processed voltage signal, and control the high-voltage power signal output by the high-voltage control circuit 31 according to the target radiation dose rate to control the working state of each GM counter tube.

[0030] It should be noted that the radiation shielding assembly 2 may be provided with a through hole for the cable to pass through, and the acquisition circuit 14 may be connected to the preamplifier circuit 33 in the radiation shielding assembly 2 via the cable.

[0031] During use, the detection assembly 1 is positioned in the area to be detected. The detection assembly 1 can be connected to the signal processing assembly 3 within the radiation shielding assembly 2 via a cable. The acquisition circuit 14 converts the current pulse signals output by each GM counter tube into voltage count signals and transmits them to the preamplifier circuit 33. The preamplifier circuit 33 filters and amplifies each voltage count signal. The processor 34 determines the target radiation dose rate based on the processed voltage signal. After determining the target radiation dose rate, the processor 34 controls the high-voltage control circuit 31 to stop outputting the high-voltage power supply signal to the corresponding counter when the target radiation dose rate exceeds the range of the corresponding counter, thereby overloading the lower-range counter tubes and preventing the internal quenching gas of the low-range counter tubes from being continuously depleted at high-range radiation dose rates, thereby extending the service life of the low-range counter tubes.

[0032] The radiation detection device for measuring ultra-wide-range gamma rays detects external radiation conditions through a detection component 1, converts the detected current pulse signal into a voltage count signal, and transmits it to a signal processing component 3. Based on the received voltage count signal, the signal processing component 3 determines the target radiation dose rate, thereby achieving radiation detection. During this process, the signal processing component 3 is located within a radiation shielding component 2. The radiation shielding component 2 shields the signal processing component 3 from external radiation interference, minimizing the radiation interference experienced by the signal processing component 3. This effectively reduces the immediate effects and cumulative damage to the internal circuit components of the signal processing component 3 under high radiation dose rates, improving the signal processing component 3's radiation interference resistance and thus enhancing measurement accuracy. Furthermore, the detection component 1 includes three GM counter tubes with different ranges. The processor 34 determines the target radiation dose rate based on the processed voltage signal and controls the high-voltage power supply signal output by the high-voltage control circuit 31 based on the target radiation dose rate to control the operating state of each GM counter tube. This ensures that each GM counter tube operates at an appropriate high voltage value during measurement, and provides overload protection for the lower-range counter tubes, thereby improving the reliability and service life of the radiation detection device.

[0033] In some embodiments, the processor 34 is further used to: determine the target range mode according to the target radiation dose rate and the preset switching thresholds of each range, and control the working state of each GM counter tube according to the target range mode to switch to the target range mode.

[0034] The range mode can be divided into low-range mode, mid-range mode, and high-range mode. In low-range mode, the first GM counter tube 11, the second GM counter tube 12, and the third GM counter tube 13 are all in operation (i.e., they all receive high-voltage power signals). In mid-range mode, the second GM counter tube 12 and the third GM counter tube 13 are all in operation. In high-range mode, the third GM counter tube 13 is also in operation. After switching the range mode, the overload and underload times of the GM counter tubes for all ranges can be reset to zero.

[0035] It should be noted that, in application, the initial range mode of the radiation detection device can be a low range mode, and the high voltage control circuit 31 outputs a high voltage power supply signal to each GM counter tube, and each GM counter tube is in a working state.

[0036] It can be understood that the target radiation dose rate is compared with the preset switching thresholds of each range, and the target range mode can be determined based on the comparison results. After the target range mode is determined, the working state of each GM counter tube is controlled according to the target range mode and switched to the target range mode, so that the lower range counter tube can be protected from overload, which is beneficial to improving the reliability and service life of the radiation detection device.

[0037] In some embodiments, the processor 34 is further configured to obtain a target GM counter corresponding to the target range mode, and update the target radiation dose rate according to the measurement value of the target GM counter.

[0038] The target GM counter tube corresponding to the low-range mode may be the first GM counter tube 11 , the target GM counter tube corresponding to the mid-range mode may be the second GM counter tube 12 , and the target GM counter tube corresponding to the high-range mode may be the third GM counter tube 13 .

[0039] It will be appreciated that after determining the target range mode, the processor 34 will further obtain the target GM counter corresponding to that mode. Because different range modes require GM counters with different sensitivities or measurement ranges to ensure measurement accuracy, the processor 34 will determine which GM counters to use as target GM counters based on the target range mode. The processor 34 will then obtain measurement values ​​from these target GM counters, which reflect radiation intensity information in the current environment. Based on these measurement values, the processor 34 will apply a preset algorithm or calibration parameters to update the target radiation dose rate. This updated target radiation dose rate more accurately reflects the actual radiation level in the current environment, providing a reliable basis for subsequent radiation monitoring and control.

[0040] In some embodiments, corresponding to the aforementioned embodiments, the initial range mode of the radiation detection device is the low range mode, and each GM counter tube is in a working state.

[0041] If the processor 34 determines that the target range mode is the mid-range mode, it controls the high-voltage control circuit 31 to stop supplying the high-voltage power signal to the first GM counter tube 11. Because the GM counter tube converts radiation signals into charge signals, and thus piezoelectric count values, only when a certain range of high voltage is present, when the high voltage is turned off, the counter input remains at 0. Therefore, the first GM counter tube 11 is not in an effective operating state, thus providing overload protection for the first GM counter tube 11.

[0042] When the processor 34 determines that the target range mode is the high range mode, it controls the high-voltage control circuit 31 to stop supplying high-voltage power signals to the first GM counter tube 11 and the second GM counter tube 12. Similarly, after the high-voltage control circuit 31 stops supplying high-voltage power signals to the first GM counter tube 11 and the second GM counter tube 12, the inputs to the first GM counter tube 11 and the second GM counter tube 12 remain at 0. Therefore, the first GM counter tube 11 and the second GM counter tube 12 are not in an effective operating state, and overload protection can be implemented for the first GM counter tube 11 and the second GM counter tube 12.

[0043] In some embodiments, the processor 34 is also used to: obtain the target radiation dose rate detected multiple times within a predetermined time period, determine the comparison results of the target radiation dose rate detected multiple times and the switching thresholds of each range, and when the comparison results are consistent, determine the target range mode based on the comparison results and the range priority corresponding to the current range mode.

[0044] It should be noted that when the current range mode is low-range mode, after comparing the target radiation dose rate with the switching thresholds of each range, it can be determined that it meets both the switching conditions for mid-range mode and the switching conditions for high-range mode, and the corresponding target range mode is high-range mode. If the current range mode is high-range mode, after comparing the target radiation dose rate with the switching thresholds of each range, it can be determined that it meets both the switching conditions for mid-range mode and the switching conditions for low-range mode, and the corresponding target range mode is low-range mode.

[0045] It will be understood that processor 34 will acquire the target radiation dose rate multiple times within a predetermined time period and, by analyzing the data from these multiple measurements, determine the comparison results between each detected target radiation dose rate and each range switching threshold. If the multiple comparison results all indicate that they are within the same threshold range (i.e., the comparison results are consistent), this indicates that the current radiation environment is relatively stable, avoiding the situation where switching back and forth between two range modes at a specific dose rate occurs. At this point, processor 34 not only considers the comparison results but also combines the range priority corresponding to the current range mode to ultimately determine the target range mode. Through this comprehensive judgment mechanism, the system can select the optimal range mode in a stable radiation environment, avoiding frequent range switching due to minor fluctuations in the measured value, thereby improving measurement stability and reliability.

[0046] In some embodiments, the low-medium-range switching threshold corresponding to switching from low-range mode to medium-range mode is greater than the medium-low-range switching threshold corresponding to switching from medium-range mode to low-range mode; the medium-high-range switching threshold corresponding to switching from medium-range mode to high-range mode is greater than the high-medium-range switching threshold corresponding to switching from high-range mode to medium-range mode.

[0047] For example, when the range of the low-range first GM counter tube 11 is 0.1uGy / h-10mGy / h, the range of the medium-range second GM counter tube 12 is 0.1mGy / h-10GY / h, and the range of the high-range third GM counter tube 13 is 10mGy / h-100Gy / h, the low-medium range switching threshold can be 2mGy / h, the medium-high range switching threshold and the low-high range switching threshold can be 50mGy / h, the medium-low range switching threshold and the high-low range switching threshold can be 1mGy / h, and the high-medium range switching threshold can be 45mGy / h.

[0048] The system establishes a hysteresis region by setting differential range switching thresholds (i.e., the low-mid-range switching threshold > the mid-low range switching threshold, and the mid-high range switching threshold > the high-mid-range switching threshold) to effectively prevent frequent fluctuations in ranges near critical values. When the radiation dose rate increases from the low to mid-range range, the higher low-mid-range switching threshold must be reached to trigger a switch; when the dose rate decreases, it must fall below the lower mid-low range switching threshold to switch back to the low range. This threshold difference creates an insensitive zone between adjacent ranges (for example, the effective range for the mid-range range is from the mid-low range switching threshold to the mid-high range switching threshold). Even if the measured value fluctuates slightly near the threshold, as long as it does not exceed the hysteresis region, the system will not frequently switch ranges, thus ensuring measurement stability and device lifespan. Similar logic applies to switching between the mid-range and high ranges. This effectively prevents repeated range switching even in the presence of small fluctuations in the radiation dose rate.

[0049] In some embodiments, as Figure 2 As shown, the signal processing component 3 also includes: an ADC sampling circuit 35, which is used to sample the signal output by the high-voltage control circuit 31 and generate a sampling signal to the processor 34 based on the sampling result. The processor 34 is used to determine the actual working status of each GM counter tube based on the sampling signal.

[0050] As can be understood, in a radiation detection device, the operating status of the GM counter tubes directly depends on the stability and accuracy of the high-voltage power supply. Therefore, it is necessary to confirm the signal output by the high-voltage control circuit 31. The ADC sampling circuit digitizes the high-voltage signal output by the high-voltage control circuit 31 at a certain sampling frequency, converting the analog signal into a digital sampling signal before transmitting it to the processor 34. After receiving the sampling signal, the processor 34 analyzes the actual supply status of the high-voltage power supply signal and infers the actual operating status of each GM counter tube. Based on the actual operating status of each GM counter tube, the current range mode of the device can be determined. During the range mode switching process, the range mode switching process can be determined to ensure that the entire radiation detection system is always in optimal operating condition. Furthermore, during subsequent maintenance, the sampling results of the ADC sampling circuit 35 can quickly determine whether the high-voltage control circuit 31 is abnormal.

[0051] In some embodiments, the processor 34 is also used to: enter a first intermediate state after determining that the high-range mode is transferred to the medium-range mode or the low-range mode, determine the target radiation dose rate of the first intermediate state as the product of the measurement value of the third GM counter tube 13 and the preset first attenuation coefficient, and end the first intermediate state when it is determined that the second GM counter tube 12 is working according to the sampling signal.

[0052] After determining that the mid-range mode is transferred to the low-range mode, the second intermediate state is entered, and the target radiation dose rate of the second intermediate state is determined as the product of the measurement value of the second GM counter tube 12 and the preset second attenuation coefficient. When it is determined that the first GM counter tube 11 is working according to the sampling signal, the second intermediate state is ended; wherein, the attenuation coefficient continues to decay per second.

[0053] The first attenuation coefficient and the second attenuation coefficient may both belong to (0.5, 1).

[0054] It can be understood that during the range switching process of the radiation detection system, processor 34 ensures a smooth transition and accurate measurement by introducing an intermediate state and a dynamic attenuation coefficient mechanism. When the system transitions from high-range mode to mid-range or low-range mode, since the corresponding GM counter for the mid-range or low-range mode is not operating, processor 34 first enters a first intermediate state. During this period, the target radiation dose rate is dynamically calculated by multiplying the measured value of the third GM counter (corresponding to the high range) by a preset first attenuation coefficient. This attenuation coefficient decays continuously every second, causing the target radiation dose rate to gradually approach the actual value of the mid-range or low-range counter. Simultaneously, processor 34 monitors the operating status of the second GM counter (corresponding to the mid-range) in real time through the ADC sampling circuit. Once normal operation is confirmed, the first intermediate state ends and the system switches to mid-range mode.

[0055] Similarly, when the system transitions from the mid-range to the low-range mode, it enters a second intermediate state, where the target radiation dose rate is dynamically adjusted based on the measured value of the second GM counter and a preset second attenuation coefficient. As the attenuation coefficient decays over time, the target radiation dose rate gradually approaches the actual value of the low-range mode. When the ADC sampling circuit detects that the first GM counter (corresponding to the low-range mode) is functioning properly, the second intermediate state ends, and the system switches to low-range mode. This dual mechanism of dynamic attenuation and state monitoring effectively avoids measurement jumps and instabilities during range switching, ensuring a smooth transition between different ranges and improving the continuity and reliability of radiation dose rate measurements.

[0056] In some embodiments, the acquisition circuit 14 includes three acquisition sub-circuits, each of which is connected between three GM counter tubes and a common ground. Each of the three acquisition sub-circuits includes a resistor and a capacitor connected in parallel.

[0057] In this embodiment, the acquisition circuit 14 employs three parallel RC-structured acquisition subcircuits, each connecting the three GM counter tubes to a common ground, forming independent signal conversion channels. When the GM counter tubes generate current pulses due to radiation ionization, the parallel resistors convert the current signals into voltage signals, while the capacitors filter and integrate, smoothing the pulse waveform and storing charge. This structure enables the output signal of each GM counter tube to be independently converted into a voltage count signal recognizable by the processor 34. The time constant (τ=RC) of the parallel RC circuits determines the system's response characteristics, ensuring accurate capture and conversion of pulse signals under varying radiation intensities. The three acquisition subcircuits share a common ground, ensuring consistency of the signal reference point and preventing signal interference, providing a stable and reliable voltage signal input for subsequent signal processing and radiation dose rate calculation.

[0058] In some embodiments, the present application also provides a radiation detection method for measuring ultra-wide range gamma rays, which is applied to the radiation detection device of any of the above schemes. Figure 3 As shown, the radiation detection method includes the following steps S301 to S303.

[0059] S301: Obtain target radiation dose rate.

[0060] S302: Determine a target range mode according to a target radiation dose rate and preset switching thresholds for each range.

[0061] S303: Control the working state of each GM counter tube according to the target range mode to switch to the target range mode.

[0062] In some embodiments, the radiation detection method further includes the steps of obtaining a target GM counter tube corresponding to the target range mode, and updating the target radiation dose rate according to a measurement value of the target GM counter tube.

[0063] In one embodiment, in step S303, the working state of each GM counter tube is controlled according to the target range mode, including: when it is determined that the target range mode is the medium range mode, the high-voltage control circuit is controlled to stop supplying the high-voltage power signal to the first GM counter tube; when the processor determines that the target range mode is the high range mode, the high-voltage control circuit is controlled to stop supplying the high-voltage power signal to the first GM counter tube and the second GM counter tube respectively.

[0064] In some embodiments, in step S302, the target range mode is determined based on the target radiation dose rate and the preset range switching thresholds, including: obtaining the target radiation dose rate detected multiple times within a predetermined time period, determining the comparison results of the target radiation dose rate detected multiple times and the range switching thresholds, and when the comparison results are consistent, determining the target range mode based on the comparison results and the range priority corresponding to the current range mode.

[0065] In some embodiments, the radiation detection method further includes: after determining that the high-range mode has transitioned to the mid-range mode or the low-range mode, entering a first intermediate state, determining a target radiation dose rate in the first intermediate state as the product of a measurement value of the third GM counter tube and a preset first attenuation coefficient, and ending the first intermediate state when determining that the second GM counter tube is operating based on a sampling signal; and after determining that the mid-range mode has transitioned to the low-range mode, entering a second intermediate state, determining a target radiation dose rate in the second intermediate state as the product of a measurement value of the second GM counter tube and a preset second attenuation coefficient, and ending the second intermediate state when determining that the first GM counter tube is operating based on a sampling signal. The attenuation coefficient decays continuously every second.

[0066] It should be noted that the radiation detection method for measuring ultra-wide range gamma rays provided in the embodiment of the present application and the radiation detection device for measuring ultra-wide range gamma rays provided in the embodiment of the present application are based on the same application concept. Therefore, the specific implementation of this embodiment can refer to the implementation of the aforementioned radiation detection device for measuring ultra-wide range gamma rays, and the repeated parts will not be repeated.

[0067] This application also provides a computer-readable medium storing a computer program that, when executed by a processor, implements the aforementioned radiation detection method for measuring ultra-wide-range gamma rays. This computer-readable medium may be included in the device / apparatus / system described in the aforementioned embodiments, or it may exist independently and not incorporated into the device / apparatus / system. The computer-readable medium carries one or more programs that, when executed, implement the methods described in the embodiments of this application.

[0068] According to an embodiment of the present application, a computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium or any combination thereof. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device, or component. In the present application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical cable, radio frequency signals, or any suitable combination thereof.

[0069] Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present application may be combined and / or combined in a variety of ways, even if such combinations or combinations are not explicitly described in the present application. In particular, without departing from the spirit and teachings of the present application, the features described in the various embodiments and / or claims of the present application may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present application. Therefore, the scope of the present application should not be limited to the above-mentioned embodiments, but should be determined not only by the attached claims, but also by the equivalents of the attached claims. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A radiation detection device for measuring ultra-wide range gamma rays, characterized in that: include: a detection component, a radiation shielding component, and a signal processing component, wherein the signal processing component is located within the radiation shielding component; The detection assembly includes a first GM counter tube, a second GM counter tube, a third GM counter tube, and an acquisition circuit. The upper range limit of the first GM counter tube is smaller than the upper range limit of the second GM counter tube, and the upper range limit of the second GM counter tube is smaller than the upper range limit of the third GM counter tube. The acquisition circuit is used to convert the current pulse signal output by each GM counter tube into a voltage counting signal. The signal processing component includes a high-voltage control circuit, a power processing circuit, a preamplifier circuit and a processor. The power processing circuit is used to convert the received DC power signal, transmit the stepped-down signal to the processor, and transmit the boosted signal to the high-voltage control circuit and the acquisition circuit respectively. The high-voltage control circuit is used to output a high-voltage power signal based on the boost signal to supply each GM counter tube. The preamplifier circuit is used to filter and amplify each of the voltage counting signals. The processor is used to determine the target radiation dose rate based on the processed voltage signal, and control the high-voltage power signal output by the high-voltage control circuit according to the target radiation dose rate to control the working state of each GM counter tube.

2. The radiation detection device for measuring ultra-wide range gamma rays according to claim 1, characterized in that: The processor is further configured to determine a target range mode according to the target radiation dose rate and preset switching thresholds for each range, and control the working state of each GM counter tube according to the target range mode to switch to the target range mode.

3. The radiation detection device for measuring ultra-wide range gamma rays according to claim 2, characterized in that: The processor is further configured to obtain a target GM counter corresponding to the target range mode, and update the target radiation dose rate according to a measurement value of the target GM counter.

4. The radiation detection device for measuring ultra-wide range gamma rays according to claim 2, characterized in that: The initial range mode of the radiation detection device is the low range mode, and each GM counter tube is in a working state; When the processor determines that the target range mode is the mid-range mode, the processor controls the high-voltage control circuit to stop supplying the high-voltage power supply signal to the first GM counter tube; When determining that the target range mode is the high range mode, the processor controls the high-voltage control circuit to stop supplying the high-voltage power supply signal to the first GM counter tube and the second GM counter tube respectively.

5. The radiation detection device for measuring ultra-wide range gamma rays according to claim 2, characterized in that: The processor is also used to: obtain the target radiation dose rate detected multiple times within a predetermined time period, determine the comparison results of the target radiation dose rate detected multiple times and the switching thresholds of each range, and when the comparison results are consistent, determine the target range mode based on the comparison results and the range priority corresponding to the current range mode.

6. The radiation detection device for measuring ultra-wide range gamma rays according to claim 2, characterized in that: The low-medium-range switching threshold corresponding to switching from the low-range mode to the medium-range mode is greater than the medium-low-range switching threshold corresponding to switching from the medium-range mode to the low-range mode; the medium-high-range switching threshold corresponding to switching from the medium-range mode to the high-range mode is greater than the high-medium-range switching threshold corresponding to switching from the high-range mode to the medium-range mode.

7. The radiation detection device for measuring ultra-wide range gamma rays according to claim 2, characterized in that: The signal processing component also includes: an ADC sampling circuit, which is used to sample the signal output by the high-voltage control circuit and generate a sampling signal to the processor based on the sampling result. The processor is used to determine the actual working status of each GM counter tube based on the sampling signal.

8. The radiation detection device for measuring ultra-wide range gamma rays according to claim 7, characterized in that: The processor is further configured to: enter a first intermediate state after determining that the high-range mode is shifted to the mid-range mode or the low-range mode, determine a target radiation dose rate in the first intermediate state as a product of a measurement value of the third GM counter tube and a preset first attenuation coefficient, and end the first intermediate state when determining, based on the sampling signal, that the second GM counter tube is operating; After determining that the mid-range mode is transferred to the low-range mode, the second intermediate state is entered, and the target radiation dose rate of the second intermediate state is determined as the product of the measurement value of the second GM counter tube and the preset second attenuation coefficient. When it is determined that the first GM counter tube is working according to the sampling signal, the second intermediate state is ended; wherein, the attenuation coefficient continues to decay per second.

9. The radiation detection device for measuring ultra-wide range gamma rays according to claim 1, characterized in that: The acquisition circuit includes three acquisition sub-circuits, which are respectively connected between three GM counter tubes and a common ground, and each of the three acquisition sub-circuits includes a resistor and a capacitor connected in parallel.

10. A radiation detection method for measuring ultra-wide range gamma rays, characterized in that: Applicable to the radiation detection device according to any one of claims 1 to 9; The radiation detection method comprises: Obtain target radiation dose rate; Determining a target range mode according to the target radiation dose rate and preset switching thresholds for each range; The working state of each GM counter tube is controlled according to the target range mode to switch to the target range mode.

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