Gamma dosage rate tiny dust sampling instrument

Abstract

The invention discloses a gamma dosage rate micro-dust sampling instrument which comprises a shell with an opening in the top, a filter membrane module, a sampling module, a detection module, a gas flow module, a data processing control module and a data display module, and the filter membrane module is arranged above the top of the shell and used for filtering radioactive micro-dust in gas to serve as a sample; the sampling module is arranged in the shell and below the filter membrane module, the sampling module comprises a sampling wind cup with an opening in the upper part, the sampling wind cup is correspondingly communicated with the filter membrane module, and an air guide pore plate is arranged at the opening of the sampling wind cup and is used for uniformly entering airflow; the detection module is arranged in the sampling wind cup and is used for measuring the gamma dosage rate instantaneous value of the sample; and the gas flow module is arranged in the shell and is communicated with the bottom of the sampling wind cup. The gamma dose rate micro-dust sampling instrument can be used as assembling equipment for individual soldiers, open air and shelters, and is used for sampling micro-dust in an atmospheric environment and a nuclear radioactive scene and detecting the gamma dose rate level of the radioactive scene in real time.

Description

Technical Field

[0001] The invention relates to the technical field of dust sampling and measurement, in particular to a gamma dose rate dust sampler. Background Art

[0002] At present, the application of nuclear energy and the development of the nuclear industry have created new energy conservation and green energy on the one hand, but they will also cause radioactive pollution on the other hand, so monitoring, prevention, protection and other issues also follow. Continuous and rapid monitoring of the local background of the ecological environment, especially in areas with polluted units and nuclear facilities, is very important for the fixed-point and non-fixed-point detection, sampling, and analysis of the types, concentrations, γ dose rate levels and their changes, dust concentrations, air quality and other dust contents of the environmental dust. If the human body works and lives in an overdose radioactive environment for a long time, it will accelerate the death of cells, inhibit the growth of new cells, cause local or systemic lesions in the human body, and seriously affect human health.

[0003] The aerosol samplers currently used in this field can only collect aerosol samples. After collection, the staff take them back to the laboratory for manual testing, manual analysis, and manual data generation. This takes a long time, has many human factors, cannot obtain the true radiation level value in time, and has no alarm function; and there is only a single working mode, such as: small samplers, which are only used as portable sampling equipment, and are not rainproof and not suitable for long-term outdoor use; outdoor samplers and assembled samplers in cabins can only be used at fixed points and cannot be carried out for use.

[0004] Therefore, it is necessary to develop a gamma dose rate dust sampler that can both take samples and measure the gamma dose rate indication at the same time, can also alarm according to the measurement threshold, and is easy to move and adapt to various scenarios. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a gamma dose rate dust sampler that can both sample and measure the gamma dose rate indication at the same time, can also alarm according to the measurement value threshold, and is easy to move and adapt to various scenarios.

[0006] The technical solution of the present invention is:

[0007] A gamma dose rate dust sampler comprises a shell with an opening on the top, a filter membrane module, a sampling module, a detection module, a gas flow module, a data processing control module, and a data display module.

[0008] The filter membrane module is arranged on the top of the shell to filter out radioactive dust in the gas as a sample;

[0009] The sampling module is arranged inside the housing and below the filter membrane module. The sampling module comprises a sampling wind cup with an open top. The sampling wind cup is correspondingly connected to the filter membrane module and an air guide plate is arranged at the open top of the sampling wind cup for uniform airflow entry.

[0010] The detection module is arranged in the sampling wind cup to measure the instantaneous value of the gamma dose rate of the sample;

[0011] The gas flow module is arranged inside the shell and communicated with the bottom of the sampling wind cup, and is used to measure the gas flow and control the gas flow rate;

[0012] The data processing control module is arranged in the housing and connected to the detection module signal for real-time processing of the detection data to obtain the gamma dose rate and to make an alarm judgment according to whether the gamma dose rate exceeds a threshold value. The data processing control module is connected to the gas flow module signal for controlling the gas flow to be constant.

[0013] The data display module is arranged on the outer wall of the shell and is connected to the data processing control module signal, and is used for real-time display of various information including gamma dose rate, alarm information, and gas flow.

[0014] In the above scheme, the γ dose rate can be detected and analyzed while collecting samples, and an alarm can be issued to determine whether it exceeds the preset threshold. During the entire sampling process, the gas flow module controls the flow rate to achieve constant flow sampling according to the preset flow rate, ensuring the uniformity and stability of the sampling process.

[0015] Preferably, a square upper cover is provided at the top opening of the shell, and the filter membrane module includes a sample membrane and a membrane holder. The sample membrane is horizontally laid on the upper cover, and the membrane holder is detachably connected to the top surface of the upper cover to press and fix the sample membrane along the edge.

[0016] Furthermore, the membrane holder and the upper cover are connected by magnetic adsorption to press and fix the sample membrane; bolts are upwardly arranged at the four corners of the upper cover to pass through the membrane holder, and butterfly nuts are arranged on the bolts. The bolts and butterfly nuts together form a calibrator module, which is a special module provided to the metrology and verification department for connecting the verification instrument.

[0017] Furthermore, the sampling wind cup is a conical square cup that is larger at the top and smaller at the bottom, and the cup mouth is closely connected to the edge of the top opening of the shell. The detection module includes a cross-shaped tube and a silicon crystal composite detection body distributed in the cross-shaped tube. The cross-shaped tube includes a first pipe and a second pipe connected in a cross shape. The first pipe and the second pipe are respectively arranged along the length and width of the sampling wind cup, and the first pipe is connected to the center of the second pipe at the center. The two ends of the first pipe are fixedly connected to the side wall of the sampling wind cup, and the center of the cross-shaped tube of the detection module corresponds to the center of the sampling wind cup plane. In this solution, the detection module is a cross-shaped silicon crystal composite with a wide detection energy range. Because the sampling flow rate of the sampling module is large, according to the principle of fluid mechanics, the gas flow rate through the center of the sample membrane formed is large, and more radioactive radiation dust is collected, so the capture rate is high.

[0018] Furthermore, the vertical distance between the detection module and the sample film is 12 mm. The gamma dose rate detection efficiency depends on the distance between the sample film and the detection module. The larger the sampling area of ​​the sample film, the larger the detection solid angle, that is, the closer the gamma dose rate detection module is to the sample film, the better the detection efficiency; but it is also necessary to avoid a too close distance so that the cross-shaped detection module blocks the air intake at the top of the sampling module, affecting the capture of radioactive dust on the sample film. Therefore, the vertical distance of 12 mm from the sample film is used to ensure uniform and efficient sampling and detection.

[0019] Preferably, the gas flow module includes an airflow housing and a constant flow module and a range module respectively arranged at the upper and lower parts of the airflow housing for detecting pressure signals. The gas flow module also includes an air source module and a driver. The air source module is connected to the lower end of the airflow housing. The driver is located in the housing and is used to drive the air source module to generate a gas flow rate.

[0020] The constant current module, range module and driver are all connected to the data processing control module signal. The data processing control module processes and calculates the real-time gas flow and the set flow following value according to the detection signals of the constant current module and the range module, and transmits a signal to the driver according to the set flow following value, so that the driver controls the gas source module to adjust the gas flow rate to achieve constant gas flow.

[0021] Furthermore, an air source module base is provided below the air source module in the shell, the air source module base is a hollow cavity connected to the air source module at the top and an exhaust port is provided on the side wall for exhausting the airflow of the air source module, the air source module base is installed on the bottom plate of the shell, and exhaust holes are arranged at intervals on the side wall of the shell. In this solution, the gas exhausted by the air source module is discharged into the shell through the exhaust port on the side wall of the air source module base, and then discharged from the exhaust hole on the side wall of the shell.

[0022] Preferably, a circle of limiting steps is provided at the upper end of the inner wall of the sampling wind cup, the edge of the air guide plate is located on the limiting steps, and the top of the air guide plate is flush with the top of the sampling wind cup. The air guide plate makes the airflow entering the sampling module evenly distributed, further ensuring the uniformity of sampling detection.

[0023] The preferred technical features for the air guide hole plate are: the air guide hole plate is located below the sample membrane, and a plurality of air guide holes of the same shape connected to each other through hole walls are evenly arranged on the air guide hole plate, and the air guide holes are regular polygon holes. All air guide holes are vertically connected, and the regular polygons are especially squares or regular hexagons. The optimized technical solution adopts regular polygons, which can achieve consistent thickness of the hole walls between adjacent holes, reduce the resistance of the gas passing through the guide holes, and the consistency of resistance is conducive to the stability of the airflow; avoid using circular guide holes, the hole walls between adjacent holes are arcs, and the thickness is uneven, so as to avoid the problem of uneven resistance of the airflow passing through the circular guide holes affecting the stability of the airflow.

[0024] The distance between the air guide plate and the sample membrane is no more than 2 mm. When the gas flow module is working, the sample membrane tends to deform downward under the action of the downward airflow. The vertical distance between the air guide plate and the sample membrane is no more than 2 mm. When the sample membrane is deformed, the deformation surface of the sample membrane can be supported to reduce deformation. The air film type directional airflow is realized, and the uniformity of sample collection of the sample membrane is achieved.

[0025] The center of the cross-shaped tube of the detection module corresponds to the center of the sampling wind cup plane, that is, the detection part corresponds to the center of the sample membrane, which is beneficial to improve the accuracy of detection.

[0026] Preferably, a control button is also provided on the shell, and the control button is connected to the data processing control module signal for setting parameters through the control button and transmitting them to the data display module for display; a cloud port is also provided on the shell, and the cloud port is connected to the data processing control module signal for uploading data to the host computer and receiving control signals issued by the host computer.

[0027] Preferably, a tripod is connected to the bottom of the housing for portable sampling by a single soldier;

[0028] Or the shell is connected to a rain and snow helmet on the top and a table-type bracket on the bottom for outdoor sampling;

[0029] Or the shell is installed on the top plate inside the cabin, and a sampling port is correspondingly opened on the top plate of the cabin to expose the filter membrane module above the shell to the cabin for sampling the external environment of the cabin, and a rain and snow helmet module is provided on the outside of the sampler port to shield the filter membrane module.

[0030] Preferably, it also includes a detection element capable of detecting atmospheric temperature, atmospheric humidity and atmospheric pressure, and the detection element is connected to the data processing control module signal. The data processing control module can calculate the gas standard volume and statistical working volume according to the detection results, and the data display module can display the atmospheric temperature, atmospheric humidity and atmospheric pressure in real time, and all data are transmitted to the host computer (data center) through the cloud port.

[0031] The beneficial effects of the present invention are:

[0032] 1. The gamma dose rate dust sampler of the present invention can be used as a single-soldier, outdoor, or cabin-mounted equipment to sample dust in the atmospheric environment and nuclear radioactive scenes, and detect the gamma dose rate level of radioactive scenes in real time online.

[0033] 2. The gamma dose rate dust sampler of the present invention realizes multiple functions and uses in one machine. It can collect samples instantly, detect the gamma dose rate instantly, and measure the instantaneous value of the gamma radiation air absorption dose rate at the detection point. The radiation level value - the gamma dose rate is obtained through amplification, calculation, analysis and strict identification by the data processing control module, and an alarm is judged based on whether it exceeds the set threshold. The gamma dose rate is displayed through the data display module, and a pre-value alarm is realized. The acquired data is uploaded to the data center through the cloud port at all times.

[0034] 4. By combining the γ-dose rate dust sampler with a tripod, a γ-dose rate individual dust sampler is formed; by combining the γ-dose rate dust sampler with a desktop bracket, a γ-dose rate outdoor dust sampler is formed, and the rain and snow helmet is used to shield the sampler; by assembling the γ-dose rate dust sampler in the cabin and installing the rain and snow helmet module externally, it is integrated into a γ-dose rate cabin-assembled dust sampler; the γ-dose rate dust sampler realizes online remote control through the cloud port.

[0035] 5. When the equipment is working, the sampling module of the γ dose rate is placed on top, and the plane sampling is carried out, so that the filter membrane can collect dust evenly. The filter membrane module is set at the top of the sampling module, which realizes uniform sampling of the sample membrane and the best collection efficiency. Therefore, for the γ dose rate dust sampling module, it is the best method to set the sample membrane at the top. The performance indicators of the equipment are very high in reliability, shock resistance, salt spray and mold resistance.

[0036] 6. The present invention can realize constant flow sampling. A constant flow module is embedded in the upper end of the air flow shell of the gas module, and a range module is provided at the lower end. The pressure signal values ​​measured by the two modules are transmitted to the data processing control module for amplification, analysis, calculation, and strict identification of control electrical signals. The electrical signals of the two modules actively and passively interact with each other to form a digital signal that is transmitted to the driver to adjust the gas source module to achieve a constant sampling flow rate, thereby making the γ dose rate dust sampler operate truly, stably and reliably. It can intelligently match the local atmospheric pressure value, adapt to work at different altitudes, and ensure a truly constant flow value. The lower end of the flow module is connected to the gas source module.

[0037] 7. The gamma dose rate dust sampler of the present invention has five working modes: single sampling, time sampling, volume sampling, cycle sampling, and online sampling. Users can select the corresponding control mode according to the needs of different scenarios to achieve specific functions. It is truly a one-machine-multiple-functions. These five working modes are all realized by a microprocessor composed of a data processing control module, a data display module, and a control button. Single sampling is set for long-time sampling, time sampling is set for time period sampling, volume sampling is set for volume sampling, cycle sampling is interval period timing cycle sampling, and online sampling is provided for intelligent mechanism cruise sampling. All of the above working modes can be remotely controlled, which is truly a one-machine-multiple-functions and one-machine-multiple-uses.

[0038] 8. The gamma dose rate dust sampler of the present invention is composed of a data processing module, a data display module, a control button, etc. to form an intelligent digital control platform. Various parameters can be set through the control button and displayed in real time through the data display module; the gamma dose rate and gas flow rate are calculated and displayed. All data are transmitted to the host computer through the cloud port, and the local data and host computer information interaction and remote control are realized through the cloud port. The communication protocol is open, and the memory recovery function is started after power failure.

[0039] 9. The gamma dose rate dust sampler of the present invention has a wide range of uses and is applicable to a variety of scenarios. The manufacturing process is modular, standardized, intelligent, and information-based. It has good compatibility, is easy to install and debug, and is convenient for on-site maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The front view of the gamma dose rate dust sampler of the present invention

[0041] Figure 2 The left view of the gamma dose rate dust sampler of the present invention

[0042] Figure 3 This is the front view of the gamma dose rate dust sampler of the present invention (without the panel)

[0043] Figure 4 A cross-sectional view of the gamma dose rate dust sampler of the present invention without the gas flow module

[0044] Figure 5 This is the right side view of the gamma dose rate dust sampler of the present invention (without the right side panel)

[0045] Figure 6 The filter module and sampling module parts diagram of the gamma dose rate dust sampler of the present invention

[0046] Figure 7 This is a diagram of the single-soldier use status of the γ dose rate dust sampler of the present invention

[0047] Figure 8 This is a diagram of the γ dose rate dust sampler of the present invention in outdoor use.

[0048] Fig. 9 This is the usage status diagram of the γ dose rate dust sampler cabin of the present invention

[0049] Among them, 1-sampling operation module, 2-power indicator, 3-membrane holder, 4-γ dose rate dust sampler, 5-control button, 6-data display module, 7-gas source module shell, 8-moving handle, 9-nameplate, 10-power plug module, 11-cloud port, 12-ground supply interface, 13-sampling wind cup (13.1-limiting step), 14-detection module (14.1-first pipe fitting 14.2-second pipe fitting), 15-airflow shell , 16-driver, 17-power module, 18-air source module base, 19-air source module, 20-range module, 21-constant current module, 22-data processing control module, 23-exhaust port, 24-shell, 25-sample membrane, 26-trip bracket, 27-rain and snow helmet, 28-desktop bracket, 29-bolt, 30-rain and snow helmet module, 31-cabin, 41-exhaust hole, 50-butterfly nut, 51-upper cover, 52-air guide plate. DETAILED DESCRIPTION

[0050] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0051] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] Example 1

[0053] like Figures 1 to 6 As shown, this embodiment provides a gamma dose rate dust sampler, including a housing 24 with an opening on the top, a filter module, a sampling module, a detection module, a gas flow module, a data processing control module 22, and a data display module 6. In this embodiment, the housing 24 is a rectangular box-shaped, and a square frame-shaped upper cover 51 is provided at the top opening. The length direction of the housing 24 is the same as that of the housing 24. Figure 1 Same in the left, right and width directions Figure 2 Center left and right.

[0054] The filter membrane module is integrated at the top of the housing 24 to filter radioactive dust in the gas as a sample. The specific structure of the filter membrane module is: it includes a sample membrane 25 and a membrane holder 3. The sample membrane 25 is horizontally laid on the upper cover 51. The membrane holder 3 is detachably connected to the top surface of the upper cover 51 of the housing 24 to press and fix the sample membrane 25 along the edge. In this embodiment, the sample membrane 25 is square, and the square hollow space in the middle of the upper cover 51 is fully laid. The membrane holder 3 is also in the shape of a square frame. The membrane holder 3 and the upper cover 51 are connected by magnetic adsorption, just pressing and fixing the four sides of the sample membrane 25. The membrane holder 3 and the upper cover 51 both contain magnetic materials, so they can be magnetically adsorbed to each other, which is convenient for quickly installing the sample membrane 25 above the housing 24. The length and width directions of the upper cover 51, the membrane holder 3, and the sample membrane 25 are consistent with the length and width directions of the housing 24.

[0055] Bolts 29 are provided upward at the four corners of the upper cover 51 to pass through the membrane holder 3, and butterfly nuts 50 are provided on the bolts 29. Under normal circumstances, the butterfly nuts 50 press the membrane holder 3 above the membrane holder 3. The bolts 29 and butterfly nuts 50 together form a calibrator module, which is a special module provided to the metrology and calibration department for connecting the calibration instrument, so as to regularly calibrate the γ dose rate dust sampler 4. During calibration, only the butterfly nuts 50 need to be removed from the bolts 29, the four corners of the calibration instrument need to be passed through the bolts 29, and then the butterfly nuts 50 are tightened to complete the installation of the calibration instrument.

[0056] The sampling module is arranged inside the shell 24 and below the filter module. The sampling module includes a sampling wind cup 13 with an open top. The sampling wind cup 13 is correspondingly connected to the filter module and an air guide plate 52 is provided at the open end of the sampling wind cup 13 for uniform airflow entry. The sampling wind cup 13 is a conical square cup with a large top and a small bottom, and the cup mouth is closely connected to the bottom surface of the top opening edge of the shell 24. In this embodiment, the length, width and height of the sampling wind cup 13 and the air guide plate 52 are consistent with the length, width and height of the shell 24. The two pairs of opposite side walls of the sampling wind cup 13 are symmetrically inclined downward and inward. A circle of limiting steps 13.1 is provided at the upper end of the inner wall of the sampling wind cup 13. The edge of the air guide plate 52 is located on the limiting step 13.1 to install the air guide plate 52. The size of the air guide plate 52 is adapted to the opening of the sampling wind cup 13.

[0057] The air guide plate 52 is evenly provided with a plurality of air guide holes of the same shape connected to each other through the hole wall, and the top of the air guide plate 52 is flush with the top of the sampling wind cup 13. In this embodiment, the air guide holes are vertically through square holes, which are evenly spaced along the length and width of the air guide plate 52. There is a vertical spacing of no more than 2 mm between the air guide plate 52 and the sample membrane 25. When the gas flow module is working, the sample membrane 25 tends to deform downward under the action of the downward airflow. The vertical spacing between the air guide plate 52 and the sample membrane 25 is no more than 2 mm. When the sample membrane 25 is deformed, the deformation surface of the sample membrane can be supported to reduce the deformation. Air film type directional airflow is realized, and the uniformity of sample collection by the sample membrane is achieved.

[0058] The detection module 14 is arranged in the sampling wind cup 13 for measuring the instantaneous value of the gamma dose. The specific structure of the detection module 14 is as follows: it includes a cross-shaped tube and a silicon crystal composite detector evenly distributed in the cross-shaped tube. The cross-shaped tube includes a first tube 14.1 and a second tube 14.2 connected in a cross shape. The first tube 14.1 and the second tube 14.2 are arranged along the length and width direction of the sampling wind cup 13 respectively, and the first tube 14.1 is connected to the center of the second tube 14.2 at the center. The lateral ends of the first tube 14.1 are respectively fixedly connected to the lateral opposite side walls of the sampling wind cup 13, so as to install the detection module 14 in the sampling wind cup 13. The center of the cross-shaped tube of the detection module 14 corresponds to the plane center of the sampling wind cup 13. There is a gap between the detection module 14 and the upper air guide plate 52, and between the detection module 14 and the bottom plate of the sampling wind cup 13 below, and sufficient distance is reserved to avoid affecting the air intake sampling. The detection module 14 has a cross-shaped silicon crystal complex for detecting a wide range of energy. Because the sampling flow of the sampling module is large, according to the principles of fluid mechanics, the gas flow through the center of the sample membrane 25 is large, and more radioactive radiation dust is collected, so the capture rate is high.

[0059] In this embodiment, the vertical distance between the cross center of the detection module 14 and the sample film 25 is 12 mm. The gamma dose rate detection efficiency depends on the distance between the sample film and the detection module. The larger the sampling area of ​​the sample film, the larger the detection solid angle. That is, the closer the gamma dose rate detection module is to the sample film, the better the detection efficiency. However, it is also necessary to avoid a distance that is too close so that the cross-shaped detection module blocks the air intake at the top of the sampling module, affecting the capture of radioactive dust on the sample film. Therefore, the vertical distance of 12 mm from the sample film is used to ensure uniform and efficient sampling and detection.

[0060] The gas flow module is arranged inside the housing 24 and is connected to the bottom of the sampling wind cup 13. The specific structure of the gas flow module is: it includes a vertical tubular airflow housing 15 and a constant current module 21 and a range module 20 respectively arranged in the upper and lower parts of the airflow housing 15 for detecting pressure signals. The pipe diameters of the upper and lower parts of the airflow housing 15 are shrunk, and the pipe diameter at the constant current module 21 is larger than the pipe diameter at the range module 20. The gas flow module also includes an air source module 19 and a driver 16. The air source module 19 is connected to the lower end of the airflow housing 15. The driver 16 is located in the housing 24 and is used to drive the air source module 19 to generate a gas flow rate. In this embodiment, the air source module 19 is a negative pressure fan, the inlet end is connected to the lower end of the airflow housing 15, and the outlet end is connected to the air source module base 18 arranged below.

[0061] The air source module base 18 is a hollow cavity connected to the air source module 19 at the top. The air source module base 18 is arranged in the shell 24 and below the air source module 19. The air source module base 18 is installed at the center of the bottom plate of the shell 24. The air source module base 18 is provided with an exhaust port 23 on the side wall for discharging the airflow of the air source module 19. The side wall of the shell 24 is provided with exhaust holes 41 at intervals. In this embodiment, the gas discharged from the air source module 19 is discharged into the shell 24 through the exhaust port 23 on the side wall of the air source module base 18, and then discharged from the exhaust hole 41 on the side wall of the shell 24.

[0062] The data processing control module 22 is disposed in the housing 24 and is signal-connected to the detection module 14 for real-time processing of the detection data to obtain the gamma dose rate and to make an alarm judgment based on whether the gamma dose rate exceeds a set threshold.

[0063] The data processing control module 22 is connected to the gas flow module signal to control the gas to maintain a constant flow rate according to the set flow rate. Specifically, the constant flow module 21, the range module 20, and the driver 16 of the gas flow module are all connected to the data processing control module 22 signal. The data processing control module 22 processes and calculates the real-time gas flow rate and the set flow follow value according to the detection signal of the constant flow module 21 and the range module 20, and transmits a signal to the driver 16 according to the set flow follow value, so that the driver 16 controls the gas source module 19 to adjust the gas flow rate to achieve a constant gas flow rate.

[0064] The data display module 6 is arranged on the outer wall of the housing 24 and is signal-connected to the data processing control module 22 for real-time display of various information including gamma dose rate, alarm information, and gas flow rate.

[0065] The housing 24 is also provided with a control button 5, which is connected to the data processing control module 22 by signal, and is used to set parameters (such as gas setting flow) through the control button 5 and transmit them to the data display module 6 for display; the housing 24 is also provided with a cloud port 11, which is connected to the data processing control module 22 by signal, and is used to upload data to the host computer and receive control signals from the host computer. A power module 17 is provided inside the housing 24, which is used to power all electrical components of the γ dose rate dust sampler (including but not limited to the detection module 14, the range module 20, the constant current module 21, the driver 16, the data processing control module 22, the data display module 6, and the control button 5).

[0066] As a preferred example, the housing 24 of the γ dose rate dust sampler has a movable handle 8, a nameplate 9, a power plug module 10, a cloud port 11, and a ground supply interface 12 on the left outer wall. The nameplate 9 records product information; the power plug module 10 is connected to the power module 17 in the housing 24 for external power supply; the ground supply interface 12 is used to connect the ground wire. The front panel of the housing 24 is provided with a data display module 6, a control button 5, a sampling operation module 1, and a power indicator 2. The sampling operation module 1 is used to display whether the γ dose rate dust sampler is in sampling operation. The light is on to indicate that the sampling operation is in progress. The power indicator 2 is used to display whether the γ dose rate dust sampler is powered on. The light is on to indicate that the power is on.

[0067] As a preferred example, the centers of the sample membrane 25, the sampling wind cup 13, the detection module 14, the airflow housing 15, the air source module 19, and the air source module base 18 are all vertically corresponding to each other, further ensuring the uniformity of sampling and detection.

[0068] As a preferred example, an air source module shell 7 is installed below the shell 24. The air source module shell 7 is provided with three instrument shock-absorbing feet at its lower end, and four shock-absorbing feet are provided on the right side of the shell 24 for easy use and transportation.

[0069] As a preferred example, the gamma dose rate dust sampler also includes a detection element that can detect atmospheric temperature, atmospheric humidity, and atmospheric pressure, and the detection element is connected to the data processing control module 22. The data processing control module 22 can calculate the gas standard volume and statistical working volume according to the detection results, and display the atmospheric temperature, atmospheric humidity, and atmospheric pressure in real time through the data display module 6, and all data are transmitted to the host computer (data center) through the cloud port.

[0070] The working principle of this embodiment is:

[0071] The gas carries radioactive dust, which is filtered by the sample membrane 25 and remains on the sample membrane. The gas enters the sampling wind cup 13 of the sampling module. The detection module 14 in the sampling wind cup 13 can instantly detect the radioactive dust at the point and the instantaneous value of the γ radiation air absorption dose rate, and transmit the signal to the data processing control module 22 for amplification, analysis, and strict identification of the γ dose rate level, and an alarm judgment is made based on whether the γ dose rate exceeds the threshold (if yes, an alarm message is issued), and the data display module 6 displays the γ dose rate indication, and displays an alarm when it exceeds the threshold.

[0072] The data processing control module 22 uploads all detected data to the host computer (such as the user data center) via the cloud port 11. The lower end of the sampling module 13 is connected to the gas flow module, and the gas continues to pass through the gas flow module, and is detected by the constant current module 21 and the range module 20. The detected pressure signal value is transmitted to the data processing control module 22 for amplification, calculation of the real-time gas flow and setting of the flow following signal value. The data display module 6 displays the real-time gas flow, and the following signal value is input to the driver 16 to adjust the gas flow rate of the gas source module 19 in real time to achieve constant flow sampling.

[0073] The lower end of the airflow housing 15 is connected to the air inlet of the air source module 19, and the gas passes through the air source module 19 and is discharged into the atmosphere through the air source module exhaust port 23 and the exhaust hole 41. All the detection data in this process will be processed by the data processing control module 22, displayed in real time by the data display module 6, and transmitted to the host computer through the cloud port 11 in real time. The sample membrane 25 above the sampling module can also be sent to the laboratory for further detailed detection and analysis.

[0074] Example 2

[0075] like Figure 7 As shown, when the γ dose rate dust sampler 4 is used as a γ dose rate individual dust sampler, the γ dose rate dust sampler 4 is taken out from the instrument box, the portable tripod 26 is placed, and then the γ dose rate dust sampler 4 and the tripod 26 are locked and fixed. After the equipment is installed, a new sample film 25 is installed on the top.

[0076] When installing the sample membrane 25, first remove the membrane holder 3, lay the sample membrane 25 flat on the upper cover 51, and the membrane holder 3 and the upper cover 51 are attached, adsorbed and pressed tightly, and the new sample membrane 25 is installed. The instrument is powered on, and the menu bar in the main interface of the data display module 6 is selected as needed, the gas flow rate is set, and the working mode of the sampler is selected (there are five modes: single, time, volume, cycle, and online sampling). After selecting the sampling mode, click the confirmation button in the control button 5 to start the γ dose rate dust sampler 4 to start sampling. The sampler data processing control module 22 can monitor the γ dose rate and make an alarm judgment, transmit it to the data display module 6 for display, and upload the detection data to the data center.

[0077] Example 3

[0078] like Figure 8 As shown, when the γ dose rate dust sampler 4 is used as a γ dose rate outdoor dust sampler, when the γ dose rate dust sampler 4 is installed on the rain and snow helmet 27, the card slot of the rain and snow helmet 27 is first connected to the rain and snow helmet connector on the γ dose rate dust sampler housing 24; the desktop bracket 28 is installed on a pre-made base, and finally the γ dose rate dust sampler 4 is fixed to the desktop bracket 28, and the γ dose rate outdoor dust sampler is installed. The scene and operation after the installed dust sampler is powered on refer to the operation of the γ dose rate single-soldier dust sampler in Example 2.

[0079] Example 4

[0080] like Fig. 9 As shown, when the γ-dose rate dust sampler 4 is used as a dust sampler installed in a γ-dose rate cabin, the housing 24 of the γ-dose rate dust sampler 4 is connected to the internal top plate (roof) of the cabin 31 through a customized fixed installation component, the top of the housing 24 corresponds to the sampler port opened on the top plate of the cabin 31, and the filter membrane module above the housing is exposed from the cabin 31 to facilitate sampling of the external environment of the cabin. A rain and snow helmet module 30 is installed outside the sampler port to shield the top of the γ-dose rate dust sampler 4 outside the cabin 31 to prevent rain and snow from affecting sampling. After debugging, the installation of the γ-dose rate dust sampler installed in the cabin is complete. Then connect the power plug module 10 to power the γ-dose rate dust sampler 4. After power-on, the scene and operation refer to the operation of the γ-dose rate single-soldier dust sampler in Example 2.

Claims

1. A gamma dose rate dust sampler, characterized in that: It comprises a housing (24) with a top opening, a filter module, a sampling module, a detection module, a gas flow module, a data processing control module (22), and a data display module (6). The filter membrane module is arranged on the top of the housing (24) to filter out radioactive dust in the gas as a sample; The sampling module is arranged inside the housing (24) and below the filter membrane module. The sampling module comprises a sampling wind cup (13) with an open top. The sampling wind cup (13) is correspondingly connected to the filter membrane module and an air guide plate (52) is provided at the open end of the sampling wind cup (13) for uniform airflow entry. The detection module (14) is arranged in the sampling wind cup (13) and is used to measure the instantaneous value of the gamma dose rate of the sample; The gas flow module is arranged inside the housing (24) and is connected to the bottom of the sampling wind cup (13), and is used to measure the gas flow and control the gas flow rate; The data processing control module (22) is arranged in the housing (24) and is connected to the detection module (14) by signal, and is used to process the detection data in real time to obtain the gamma dose rate and to make an alarm judgment based on whether the gamma dose rate exceeds a threshold value. The data processing control module (22) is connected to the gas flow module by signal, and is used to control the gas flow rate to be constant. The data display module (6) is arranged on the outer wall of the housing (24) and is signal-connected to the data processing control module (22) for real-time display of various information including gamma dose rate, alarm information, and gas flow rate.

2. The gamma dose rate dust sampler according to claim 1, characterized in that: A square frame-shaped upper cover (51) is provided at the top opening of the shell (24), and the filter membrane module includes a sample membrane (25) and a membrane holder (3). The sample membrane (25) is horizontally laid on the upper cover (51), and the membrane holder (3) is detachably connected to the top surface of the upper cover (51) to press and fix the sample membrane (25) along the edge.

3. The gamma dose rate dust sampler according to claim 2, characterized in that: The membrane holder (3) and the upper cover (51) are connected by magnetic attraction to press and fix the sample membrane (25); bolts (29) are upwardly provided at the four corners of the upper cover (51) to pass through the membrane holder (3), and butterfly nuts (50) are provided on the bolts (29).

4. The gamma dose rate dust sampler according to claim 2, characterized in that: The sampling wind cup (13) is a frustum-shaped square cup that is larger at the top and smaller at the bottom, and the cup mouth is closely connected to the top opening edge of the shell (24). The detection module (14) comprises a cross-shaped tube and a silicon crystal composite detection body distributed in the cross-shaped tube. The cross-shaped tube comprises a first tube (14.1) and a second tube (14.2) that are connected to form a cross. The first tube (14.1) and the second tube (14.2) are respectively arranged along the length and width direction of the sampling wind cup (13), and the first tube (14.1) is connected to the center of the second tube (14.2) at the center. The two ends of the first tube (14.1) are fixedly connected to the side wall of the sampling wind cup (13). The center of the cross-shaped tube of the detection module (14) corresponds to the center of the plane of the sampling wind cup (13).

5. The gamma dose rate dust sampler according to claim 4, characterized in that: The vertical distance between the detection module (14) and the sample film (25) is 12 mm.

6. The gamma dose rate dust sampler according to claim 1, characterized in that: The gas flow module comprises an airflow housing (15) and a constant flow module (21) and a range module (20) respectively arranged at the upper and lower parts of the airflow housing (15) for detecting pressure signals. The gas flow module also comprises an air source module (19) and a driver (16). The air source module (19) is connected to the lower end of the airflow housing (15). The driver (16) is located in the housing (24) and is used to drive the air source module (19) to generate a gas flow rate. The constant current module (21), the range module (20), and the driver (16) are all connected to the data processing control module (22) by signal. The data processing control module (22) processes and calculates the detection signals of the constant current module (21) and the range module (20) to obtain the real-time gas flow rate and the set flow rate following value, and transmits a signal to the driver (16) according to the set flow rate following value, so that the driver (16) controls the gas source module (19) to adjust the gas flow rate and realize a constant gas flow rate.

7. The gamma dose rate dust sampler according to claim 6, characterized in that: An air source module base (18) is provided inside the shell (24) below the air source module (19); the air source module base (18) is a hollow cavity connected to the air source module (19) at the top and an exhaust port (23) is provided on the side wall for exhausting the air flow of the air source module (19); the air source module base (18) is mounted on the bottom plate of the shell (24), and exhaust holes (41) are arranged at intervals on the side wall of the shell (24).

8. The gamma dose rate dust sampler according to claim 1, characterized in that: A circle of limiting steps (13.1) is provided at the upper end of the inner wall of the sampling wind cup (13), the edge of the air guide hole plate (52) is located on the limiting steps (13.1), and the top of the air guide hole plate (52) is flush with the top of the sampling wind cup (13).

9. The gamma dose rate dust sampler according to claim 1 or 8, characterized in that: The air guide hole plate (52) is located below the sample film (25), and a plurality of air guide holes of the same shape connected to each other through hole walls are evenly arranged on the air guide hole plate (52), and the air guide holes are regular polygonal holes.

10. The gamma dose rate dust sampler according to claim 1, characterized in that: The bottom of the housing (24) is connected to a tripod stand (26) for a single soldier to hold and carry samples; Or the housing (24) is connected to a rain and snow helmet (27) on the top and a table bracket (28) on the bottom for outdoor sampling; Or the shell (24) is installed on the top plate inside the cabin (31), and a sampling port is correspondingly opened on the top plate of the cabin (31) so that the filter membrane module above the shell (24) is exposed from the cabin (31) for sampling the external environment of the cabin (31), and a rain and snow helmet module (30) is provided outside the sampling port to shield the filter membrane module.

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