Gamma dose rate aerosol sampler

Abstract

The application discloses a kind of gamma dose rate micro dust sampling instrument, including top opening shell, filter membrane module, sampling module, detection module, gas flow module, data processing control module, data display module, the filter membrane module is set to shell top for filtering and retaining radioactive micro dust in gas as sample;The sampling module is set to shell interior, filter membrane module below, the sampling module includes the sampling wind cup of upper open, the sampling wind cup is communicated with filter membrane module and sampling wind cup open is equipped with air guide hole plate for uniform air flow into;The detection module is set to sampling wind cup for determining the gamma dose rate instantaneous value of sample;The gas flow module is set to shell interior, and is communicated with the bottom of sampling wind cup.This gamma dose rate micro dust sampling instrument can be used as single soldier, open air, square cabin assembly equipment, and can be used for atmospheric environment and nuclear radioactive scene micro dust sampling, and real-time detection radioactive scene gamma dose rate level.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of microdust sampling measurement, in particular to a gamma dose rate microdust sampler. BACKGROUND

[0002] At present, the application of nuclear energy and the development of nuclear industry create new energy-saving green energy on the one hand, and cause radioactive pollution on the other hand, so that monitoring, prevention and protection problems come with them. It is very important to detect, sample, analyze nuclide types, concentration, gamma dose rate level and its change, microdust concentration, air quality and other microdust content of the environment microdust for the continuous and rapid monitoring of the local background of the ecological environment, especially in the polluted unit region and the nuclear facility equipment area. Long-term work and life of human body in the environment of excessive dose of radioactivity will accelerate the decline of cells, inhibit the growth of new cells, cause local or systemic pathological changes of human body, and seriously affect the health of human body.

[0003] At present, the aerosol sampler used in this field can only collect aerosol samples, and after sampling, the staff takes back to the laboratory for manual detection, manual analysis and manual data output. Thus, it takes a long time, has many human factors, cannot obtain real radiation level value in time, and has no alarm function. Moreover, only a single working mode is provided, such as a small sampler which is only used as a portable sampling device and is not rainproof and not suitable for long-term outdoor use. The open-air sampler and the shelter-mounted sampler can only be used at fixed points and cannot be carried out.

[0004] Therefore, it is necessary to develop a gamma dose rate microdust sampler which can sample and measure gamma dose rate value at the same time, can alarm according to the measured value threshold, and is convenient to move and adapt to various scenes. SUMMARY

[0005] The purpose of the present application is to solve the problems in the prior art, provide a gamma dose rate microdust sampler which can sample and measure gamma dose rate value at the same time, can alarm according to the measured value threshold, and is convenient to move and adapt to various scenes.

[0006] The technical scheme of the present application is as follows:

[0007] A gamma dose rate microdust sampler, comprising a shell with a top opening, a filter membrane module, a sampling module, a detection module, a gas flow module, a data processing and control module, and a data display module,

[0008] The filter membrane module is arranged at the top of the shell and used for filtering and retaining radioactive microdust in the gas as a sample.

[0009] The sampling module is arranged inside the shell below the filter membrane module, and the sampling module comprises a sampling air cup with an open top, the sampling air cup is in communication with the filter membrane module, and the sampling air cup is provided with a wind guide hole plate at the open top for uniform air flow.

[0010] The detection module is arranged in the sampling air cup for measuring the instantaneous value of the gamma dose rate of the sample.

[0011] The gas flow module is arranged inside the shell and is in communication with the bottom of the sampling air cup for measuring the gas flow and controlling the gas flow rate.

[0012] The data processing and control module is arranged in the shell and is in signal connection with the detection module for real-time processing of the detection data to obtain the gamma dose rate and alarm judgment according to whether the gamma dose rate exceeds the threshold value, and the data processing and control module is in signal connection with the gas flow module for controlling the constant gas flow.

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

[0014] In the above scheme, the gamma dose rate is obtained by collecting and analyzing the sample, and it can be judged whether the preset threshold is exceeded to alarm. During the whole sampling process, the gas flow module controls the flow rate to realize constant flow sampling according to the preset flow rate, and ensures the uniformity and stability of the sampling process.

[0015] Preferably, the top opening of the shell is provided with a square-shaped upper cover, the filter membrane module comprises a sample membrane and a membrane fixer, the sample membrane is horizontally laid on the upper cover, and the membrane fixer is detachably connected to the top surface of the upper cover to press and fix the sample membrane along the edge.

[0016] Further, the membrane fixer is magnetically adsorbed to the upper cover to press and fix the sample membrane, and bolts are arranged at the four corners of the upper cover and pass through the membrane fixer, and butterfly nuts are arranged on the bolts. The bolts and butterfly nuts together form a calibrator module, which is a special module provided for the metrological verification department to connect the verification instrument.

[0017] Further, the sampling cup is a tapered square cup with a large top and a small bottom, and the cup opening is tightly connected to the top opening edge of the shell. The detection module includes a cross-shaped tube and a silicon crystal composite probe 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 arranged along the length and width directions of the sampling cup, respectively, and the center of the first pipe is connected to the center of the second pipe. The two ends of the first pipe are fixedly connected to the side wall of the sampling cup, and the center of the cross-shaped tube of the detection module corresponds to the center of the plane of the sampling cup. In this scheme, the detection module is a cross-shaped silicon crystal composite, and the detection energy is wide. Because the sampling flow of the sampling module is large, according to the principle of fluid mechanics, the central passage of the sample film is formed by a large gas flow, and the radioactive radiation dust collection is more, so the capture rate is high.

[0018] Further, the vertical distance between the detection module and the sample film is 12 mm. The detection efficiency of the gamma dose rate depends on the distance between the sample film and the detection module. The sample film has a large sampling area and a large 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 too close distance to form a block to the inlet air on the top of the cross-shaped detection module, which affects the capture of the radioactive dust on the sample film. Therefore, the vertical distance of 12 mm from the sample film ensures uniform and efficient sampling detection.

[0019] Preferably, the gas flow module includes a gas flow shell and a constant flow module and a range module arranged in the upper and lower parts of the gas flow shell for detecting pressure signals. The gas flow module further includes a gas source module and a driver. The gas source module is connected to the lower end of the gas flow shell, and the driver is located in the shell for driving the gas source module to generate a gas flow rate.

[0020] The constant flow module, the range module, and the driver are connected to the data processing control module. 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 flow module and the range module, and transmits signals 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 realize constant gas flow.

[0021] Further, a gas source module seat is arranged below the gas source module in the shell. The gas source module seat is a hollow cavity with the top connected to the gas source module and the side wall provided with an exhaust port for discharging the gas flow of the gas source module. The gas source module seat is installed on the bottom plate of the shell, and the exhaust holes are arranged on the side wall of the shell. In this scheme, the gas discharged from the gas source module is discharged to the shell through the exhaust port on the side wall of the gas source module seat, and then discharged from the exhaust holes on the side wall of the shell.

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

[0023] The preferred technical features of the air guide hole plate are that the air guide hole plate is located below the sample film, a plurality of air guide holes with the same shape are uniformly arranged on the air guide hole plate and connected by hole walls, and the air guide holes are regular polygonal holes. All air guide holes are vertically through, and the regular polygonal holes are particularly square or hexagonal. The optimized technical solution adopts regular polygonal holes, which can keep the thickness of the hole walls between adjacent holes consistent, reduce the resistance of gas passing through the air guide holes, and keep the resistance consistent, which is conducive to stable airflow. By avoiding using circular air guide holes, the thickness of the hole walls between adjacent holes is not uniform, which avoids the problem of uneven airflow through the circular air guide holes affecting airflow stability.

[0024] The distance between the air guide hole plate and the sample film is not greater than 2 mm. When the gas flow module is working, the sample film has a tendency to deform downward under the action of downward airflow. The vertical distance between the air guide hole plate and the sample film is not greater than 2 mm, which can support the deformed surface of the sample film and reduce deformation when the sample film deforms. The gas film type directional airflow is realized, and the uniformity of sample collection by the sample film is realized.

[0025] The center of the detection module cross-shaped tube corresponds to the center of the plane of the sampling air cup, that is, the center of the detection part corresponds to the center of the sample film, which is conducive to improving the accuracy of detection.

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

[0027] Preferably, the bottom of the shell is connected with a tripod support for single soldier handheld portable sampling;

[0028] Or the top of the shell is connected with a rain and snow helmet, and the bottom is connected with a table type support for open air sampling;

[0029] Or the shell is installed at the top plate of the shelter, and a sampling instrument port is arranged at the top plate of the shelter to expose the filter membrane module above the shell to the outside of the shelter for sampling the external environment of the shelter. A rain and snow helmet module is arranged outside the sampling instrument port to shield above the filter membrane module.

[0030] Preferably, the detection elements for detecting atmospheric temperature, atmospheric humidity, and atmospheric pressure are also included, and the detection elements are in signal connection with the data processing control module. The data processing control module can calculate the gas standard condition volume and the working condition volume according to the detection results, and the data display module can display the atmospheric temperature, atmospheric humidity, and atmospheric pressure in real time. All the data are transmitted to the upper computer (data center) through the cloud port.

[0031] The present application has the following advantages:

[0032] 1. The gamma dose rate micro dust sampler of the present application can be used as a single soldier, open-air, and shelter-mounted device for sampling the atmospheric environment and nuclear radioactive scene micro dust and real-time online detecting the gamma dose rate level of the radioactive scene.

[0033] 2. The gamma dose rate micro dust sampler of the present application realizes one machine with multiple functions and multiple uses, that is, it can collect samples and detect gamma dose rate in real time. The instantaneous value of the gamma radiation air absorption dose rate at the detection point is measured, and the radiation level value, that is, the gamma dose rate, is obtained through amplification, operation, analysis, and identification of the data processing control module. The gamma dose rate is displayed through the data display module, and the pre-value alarm is realized. The obtained data is uploaded to the data center through the cloud port in real time.

[0034] 4. The gamma dose rate micro dust sampler is combined with a tripod to form a gamma dose rate single-soldier micro dust sampler. The gamma dose rate micro dust sampler is combined with a table stand to form a gamma dose rate open-air micro dust sampler. A rain and snow helmet is used to shield above the sampler. The gamma dose rate micro dust sampler is integrated with a rain and snow helmet module installed outside the shelter to form a gamma dose rate shelter-mounted micro dust sampler. The gamma dose rate micro dust sampler realizes online remote control through the cloud port.

[0035] 5. The gamma dose rate sampling module is placed on the top of the device during operation, and the planar sampling realizes uniform collection of micro dust on the filter membrane. The filter membrane module is arranged at the top end of the sampling module, which realizes uniform sampling of the sample membrane and the best collection efficiency. Therefore, the gamma dose rate micro dust sampling module is the optimal method to arrange the sample membrane at the top end. The device has very high reliability, shock resistance, salt mist and mold resistance performance indicators.

[0036] 6. The application can realize constant flow sampling. The upper end of the gas flow shell of the gas module is embedded with the constant flow module, and the lower end is provided with the range module. The pressure signal values measured by the two modules are transmitted to the data processing control module for amplification, analysis, operation and identification of the control electric signal. The two module electric signals actively and passively interact with each other to form a digital signal transmitted to the driver to adjust the gas source module to realize constant sampling flow, so that the gamma dose rate dust sampler can truly, stably and reliably operate, intelligently mark the local atmospheric pressure value, adapt to different altitudes, ensure the real constant flow value, and the lower end of the flow module is connected to the gas source module.

[0037] 7. The gamma dose rate dust sampler of the application is provided with five working modes: single sampling, time sampling, volume sampling, cycle sampling and online sampling. Users can select the corresponding control mode according to different scenes to realize specific functions, which is really multi-functional. The five working modes are realized by the microprocessor composed of the data processing control module, the data display module and the control button. The single sampling is set for long time sampling, the time sampling is set for time period sampling, the volume sampling is set for volume sampling, the cycle sampling is set for interval period cycle sampling, and the online sampling is provided for intelligent mechanism cruise sampling. The above working modes can be remotely controlled, which is really multi-functional.

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

[0039] 9. The gamma dose rate dust sampler of the application has wide application and diversified application scenes. The manufacturing process adopts modularization, standardization, intelligentization and informatization, has good compatibility, is convenient to install and debug, and is convenient to maintain on site. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a front view of the gamma dose rate dust sampler of the application

[0041] Figure 2 It is a left view of the gamma dose rate dust sampler of the application

[0042] Figure 3 It is a front view of the gamma dose rate dust sampler of the application (without panel)

[0043] Figure 4 It is a cross-sectional view of the gamma dose rate dust sampler of the application without the gas flow module

[0044] Figure 5 Right view of gamma dose rate micro dust sampler of the present application (remove right side plate)

[0045] Figure 6 Parts drawing of filter membrane module and sampling module of gamma dose rate micro dust sampler of the present application

[0046] Figure 7 Single soldier use state drawing of gamma dose rate micro dust sampler of the present application

[0047] Figure 8 Open air use state drawing of gamma dose rate micro dust sampler of the present application

[0048] Figure 9 Shelter use state drawing of gamma dose rate micro dust sampler of the present application

[0049] Wherein, 1-sampling operation module, 2-power supply indication, 3-membrane fixer, 4-gamma dose rate micro dust sampler, 5-control button, 6-data display module, 7-gas source module shell, 8-moving handle, 9-plaque, 10-power supply connector module, 11-cloud port, 12-ground supply interface, 13-sampling wind cup (13.1-limiting step), 14-detection module (14.1-first pipe 14.2-second pipe), 15-gas flow shell, 16-driver, 17-power module, 18-gas source module base, 19-gas source module, 20-measuring range module, 21-constant current module, 22-data processing control module, 23-exhaust port, 24-shell, 25-sample membrane, 26-tripod, 27-rain and snow helmet, 28-table stand, 29-bolt, 30-rain and snow helmet module, 31-shelter, 41-exhaust hole, 50-thyroid nut, 51-upper cover, 52-air guide hole plate. DETAILED DESCRIPTION

[0050] The embodiments of the present application will be described in detail below, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout the whole description. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0051] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0052] Embodiment 1

[0053] As Figures 1-6 shown, the embodiment provides a gamma dose rate micro dust sampler, which includes a top-opened shell 24, a filter membrane module, a sampling module, a detection module, a gas flow module, a data processing control module 22, and a data display module 6. In the embodiment, the shell 24 is a cuboid box, and a square frame-shaped upper cover 51 is arranged at the top opening of the shell 24. The length direction of the shell 24 is the same as Figure 1 the left-right direction of the shell 24, and the width direction of the shell 24 is the same as Figure 2 the left-right direction of the shell 24.

[0054] The filter membrane module is integrated at the top of the shell 24 for filtering radioactive micro dust in the gas as a sample. The specific structure of the filter membrane module is as follows: the filter membrane module includes a sample membrane 25 and a membrane fixer 3. The sample membrane 25 is horizontally laid on the upper cover 51, and the membrane fixer 3 is detachably connected to the top surface of the upper cover 51 of the shell 24 to press and fix the sample membrane 25 along the edge. In the embodiment, the sample membrane 25 is square, and is fully laid in the square hollow part in the middle of the upper cover 51. The membrane fixer 3 is also square frame-shaped, and is connected to the upper cover 51 by magnetic adsorption, so as to press and fix the four edges of the sample membrane 25. The membrane fixer 3 and the upper cover 51 both contain magnetic materials, so they can be magnetically adsorbed to each other, which facilitates the quick installation of the sample membrane 25 above the shell 24. The length and width directions of the upper cover 51, the membrane fixer 3, and the sample membrane 25 are consistent with the length and width directions of the shell 24.

[0055] The upper cover 51 is provided with bolts 29 penetrating the membrane fixer 3 at the four corners, and the bolts 29 are provided with butterfly nuts 50. In the normal state, the butterfly nuts 50 press and fix the membrane fixer 3 above the membrane fixer 3. The bolts 29 and the butterfly nuts 50 together form a calibrator module, which is a special module provided for the metrological verification department to connect the verification instrument, so as to periodically calibrate the gamma dose rate micro dust sampler 4. When calibrating, the butterfly nuts 50 are only removed from the bolts 29, the verification instrument is penetrated through the bolts 29 at the four corners, and then the butterfly nuts 50 are tightened to complete the installation of the verification instrument.

[0056] The sampling module is arranged inside the shell 24 below the filter membrane module, and the sampling module comprises an open-top sampling air cup 13. The sampling air cup 13 is in communication with the filter membrane module, and the opening of the sampling air cup 13 is provided with a wind guide hole plate 52 for uniform air flow. The sampling air cup 13 is a tapered square cup with a large upper part and a small lower part, and the opening of the cup is connected to the bottom surface of the opening edge of the top of the shell 24. In this embodiment, the length, width and height of the sampling air cup 13 and the wind guide hole plate 52 are consistent with the length, width and height of the shell 24. The two opposite side walls of the sampling air cup 13 are symmetrically inclined downward. A limiting step 13.1 is arranged on the upper end of the inner wall of the sampling air cup 13. The edge of the wind guide hole plate 52 is arranged on the limiting step 13.1 to install the wind guide hole plate 52. The size of the wind guide hole plate 52 is matched with the opening of the sampling air cup 13.

[0057] A plurality of wind guide holes with the same shape are arranged on the wind guide hole plate 52 and connected by hole walls. The top of the wind guide hole plate 52 is flush with the top of the sampling air cup 13. In this embodiment, the wind guide holes are vertical square holes arranged uniformly along the length and width of the wind guide hole plate 52. The vertical distance between the wind guide hole plate 52 and the sample film 25 is not greater than 2 mm. When the gas flow module is working, the sample film 25 has a downward deformation trend under the action of the downward air flow. The vertical distance between the wind guide hole plate 52 and the sample film 25 is not greater than 2 mm. When the sample film 25 deforms, the sample film deformation surface can be supported to reduce deformation. The gas film type directional air flow is realized, and the uniformity of the sample film collecting samples is realized.

[0058] The detection module 14 is arranged in the sampling air cup 13 for measuring the instantaneous value of the gamma dose. The specific structure of the detection module 14 comprises a cross-shaped tube and a silicon crystal composite probe uniformly distributed in the cross-shaped tube. The cross-shaped tube comprises a first pipe 14.1 and a second pipe 14.2 connected in a cross shape. The first pipe 14.1 and the second pipe 14.2 are arranged along the length and width of the sampling air cup 13, respectively. The center of the first pipe 14.1 is in communication with the center of the second pipe 14.2. The two ends of the first pipe 14.1 are fixedly connected to the two opposite side walls of the sampling air cup 13 in the transverse direction, for installing the detection module 14 in the sampling air cup 13. The center of the cross-shaped tube of the detection module 14 corresponds to the center of the plane of the sampling air cup 13. There is a distance between the detection module 14 and the wind guide hole plate 52 above and between the detection module 14 and the bottom plate of the sampling air cup 13 below, so as to avoid affecting the air sampling. The probe of the detection module 14 is a cross-shaped silicon crystal composite. The detection energy is wide. According to the principle of fluid mechanics, the gas flow is large in the center of the sample film 25, and the radioactive dust collection is more, so the capture rate is high.

[0059] The vertical distance between the cross-shaped center of the detection module 14 and the sample film 25 is 12 mm in this embodiment. The detection efficiency of the gamma dose rate depends on the distance between the sample film and the detection module. The larger the sampling area of the sample film and the larger the detection solid angle, the better the detection efficiency of the gamma dose rate detection module. However, it is necessary to avoid too close distance to prevent the cross-shaped detection module from blocking the air inlet at the top of the sampling module, which affects the capture of radiation dust on the sample film. Therefore, the vertical distance of 12 mm from the sample film ensures uniform and efficient sampling and detection.

[0060] The gas flow module is arranged in the housing 24 and communicates with the bottom of the sampling air cup 13. The specific structure of the gas flow module is as follows: it includes a vertical tubular gas flow housing 15 and a constant flow module 21 and a range module 20 arranged in the upper and lower parts of the gas flow housing 15 for detecting pressure signals. The upper and lower parts of the gas flow housing 15 are contracted in diameter, and the diameter of the constant flow module 21 is larger than that of the range module 20. The gas flow module further includes a gas source module 19 and a driver 16. The gas source module 19 communicates with the lower end of the gas flow housing 15, and the driver 16 is located in the housing 24 for driving the gas source module 19 to generate a gas flow rate. In this embodiment, the gas source module 19 is a negative pressure fan, the inlet end is connected with the lower end of the gas flow housing 15, and the outlet end communicates with the gas source module base 18 arranged below.

[0061] The gas source module base 18 is a hollow cavity with the top communicating with the gas source module 19. The gas source module base 18 is arranged below the gas source module 19 in the housing 24 and is installed at the center of the bottom plate of the housing 24. An exhaust port 23 is arranged on the side wall of the gas source module base 18 for discharging the gas flow of the gas source module 19, and exhaust holes 41 are arranged on the side wall of the housing 24 at intervals. In this embodiment, the gas discharged by the gas source module 19 is discharged into the housing 24 through the exhaust port 23 on the side wall of the gas source module base 18, and then discharged from the exhaust holes 41 on the side wall of the housing 24.

[0062] The data processing and control module 22 is arranged in the housing 24 and is signal connected with the detection module 14 for real-time processing of the detection data to obtain the gamma dose rate and alarm judgment according to whether the gamma dose rate exceeds the set threshold value.

[0063] The data processing and control module 22 is signal connected with the gas flow module for controlling the gas to keep the flow constant at the set flow rate. Specifically, the constant flow module 21, the range module 20 and the driver 16 of the gas flow module are signal connected with the data processing and control module 22. The data processing and control module 22 processes and calculates the real-time gas flow and the set flow following value according to the detection signals of the constant flow module 21 and the range module 20, and transmits signals to the driver 16 according to the set flow following value, so that the driver 16 controls the gas source module 19 to adjust the gas flow rate to realize the constant gas flow.

[0064] The data display module 6 is arranged on the outer wall of the shell 24 and is in signal connection with the data processing control module 22, for displaying various information including the gamma dose rate, alarm information and gas flow in real time.

[0065] The shell 24 is further provided with a control button 5 in signal connection with the data processing control module 22, for setting parameters (such as the set gas flow) through the control button 5 and transmitting the parameters to the data display module 6 for display; the shell 24 is further provided with a cloud port 11 in signal connection with the data processing control module 22, for uploading data to the upper computer and receiving control signals sent by the upper computer. The shell 24 is internally provided with a power module 17, for powering all electrical devices of the gamma dose rate micro 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 shell 24 of the gamma dose rate micro dust sampler is provided with a mobile handle 8, a nameplate 9, a power plug module 10, a cloud port 11 and a ground interface 12 on the left outer wall, and the nameplate 9 records product information; the power plug module 10 is connected with the power module 17 in the shell 24, for external power supply; the ground interface 12 is used for connecting the ground wire. The data display module 6, the control button 5, the sampling operation module 1 and the power indication 2 are distributed on the front panel of the shell 24, the sampling operation module 1 is used for displaying whether the gamma dose rate micro dust sampler is in sampling work, and the bright light indicates that the sampling work is in progress, and the power indication 2 is used for displaying whether the gamma dose rate micro dust sampler is powered on, and the bright light indicates that the power is on.

[0067] As a preferred example, the sample film 25, the sampling air cup 13, the detection module 14, the air flow shell 15, the gas source module 19 and the gas source module seat 18 are vertically corresponding at the center, further ensuring the uniformity of sampling detection.

[0068] As a preferred example, the shell 24 is installed below the gas source module shell 7, the lower end of the gas source module shell 7 is provided with three instrument shock absorbing feet, and the right side of the shell 24 is provided with four shock absorbing feet, facilitating use and transportation.

[0069] As a preferred example, the gamma dose rate micro dust sampler further includes a detection element capable of detecting atmospheric temperature, atmospheric humidity and atmospheric pressure, and the detection element is in signal connection with the data processing control module 22. The data processing control module 22 can calculate the gas standard condition volume and the working condition volume according to the detection results, and display the atmospheric temperature, the atmospheric humidity and the atmospheric pressure in real time through the data display module 6, and all data are transmitted to the upper computer (data center) through the cloud port.

[0070] The working principle of the embodiment is as follows:

[0071] The gas carrying radioactive dust is filtered by the sample film 25 and stays on the sample film. The gas enters the sampling cup 13 of the sampling module. The detection module 14 in the sampling cup 13 can instantly detect the radioactive dust at the sampling point, and the instantaneous value of the gamma radiation air absorbed dose rate is transmitted to the data processing control module 22 for amplification, analysis, discrimination of the gamma dose rate level, alarm judgment according to whether the gamma dose rate exceeds the threshold value (yes, alarm information is sent out), and display of the gamma dose rate value on the data display module 6, and alarm when the threshold value is exceeded.

[0072] The data processing control module 22 uploads all the detected data to the upper computer (such as a user data center) through the cloud port 11. The lower end of the sampling module 13 is connected to the gas flow module. The gas continues to pass through the gas flow module, the constant current module 21, and the range module 20 for detection. The detected pressure signal value is transmitted to the data processing control module 22 for amplification and calculation of the real-time gas flow and set 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, realizing constant current sampling.

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

[0074] Example 2

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

[0076] When installing the sample film 25, the film fixer 3 is removed, the sample film 25 is laid on the upper cover 51, and the film fixer 3 is attached to the upper cover 51 for adsorption and compression. The instrument is powered on, the menu bar in the data display module 6 main interface is selected according to the need, the gas flow is set, the working mode of the sampler (single, time, volume, cycle, and online sampling) is selected, the sampling mode is selected, the confirm button in the control button 5 is clicked, the gamma dose rate dust sampler 4 starts sampling, the data processing control module 22 of the sampler can monitor the gamma dose rate and make alarm judgment, the data are transmitted to the data display module 6 for display, and the detection data are uploaded 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 installing the γ-dose rate dust sampler 4 on the rain and snow helmet 27, first connect the slot of the rain and snow helmet 27 to the rain and snow helmet connector on the γ-dose rate dust sampler housing 24. Then, the table bracket 28 is installed on a pre-made base. Finally, the γ-dose rate dust sampler 4 is fixed to the table bracket 28. 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 individual dust sampler in Example 2.

[0079] Example 4

[0080] like Figure 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. 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 γ-dose rate dust sampler installed in the cabin is installed. Then, the power connector module 10 is connected to power the γ-dose rate dust sampler 4. The scene and operation after power-on are similar to those of the γ-dose rate single-soldier dust sampler operation in Example 2.

Claims

1. A gamma dose rate aerosol sampler characterized by, The shell (24) including a top opening, a filter membrane module, a sampling module, a detection module, a gas flow module, a data processing and control module (22), a data display module (6), The filter membrane module is arranged at the top of the shell (24) for filtering radioactive dust in the gas as a sample, and a square-shaped upper cover (51) is arranged at the top opening of the shell (24). The filter membrane module includes a sample membrane (25) and a membrane fixer (3). The sample membrane (25) is horizontally laid on the upper cover (51), and the membrane fixer (3) is detachably connected to the top surface of the upper cover (51) to tightly fix the sample membrane (25) along the edge. The sampling module is arranged inside the shell (24) below the filter membrane module. The sampling module includes an open-top sampling air cup (13). The sampling air cup (13) is in communication with the filter membrane module, and the open top of the sampling air cup (13) is provided with a wind guide hole plate (52) for uniform air flow. The sampling air cup (13) is a large-top-small-bottom frustum square cup, and the cup opening is tightly connected to the top opening edge of the shell (24). A limiting step (13.1) is arranged on the inner wall of the upper end of the sampling air cup (13). The edge of the wind guide hole plate (52) is located on the limiting step (13.1). The top of the wind guide hole plate (52) is flush with the top of the sampling air cup (13). The wind guide hole plate (52) is located below the sample membrane (25). A plurality of wind guide holes with the same shape are uniformly arranged on the wind guide hole plate (52) and connected by hole walls. The wind guide hole is a regular polygon hole. The vertical distance between the wind guide hole plate (52) and the sample membrane (25) is not greater than 2 mm. The detection module (14) is arranged in the sampling air cup (13) for measuring the instantaneous value of the gamma dose rate of the sample. The detection module (14) includes a cross-shaped tube and a silicon crystal composite probe distributed in the cross-shaped tube. The cross-shaped tube includes a first pipe (14.1) and a second pipe (14.2) connected in a cross shape. The first pipe (14.1) and the second pipe (14.2) are arranged along the length and width directions of the sampling air cup (13), respectively. The center of the first pipe (14.1) is in communication with the center of the second pipe (14.2). The two ends of the first pipe (14.1) are fixedly connected to the side wall of the sampling air cup (13). The center of the cross-shaped tube of the detection module (14) corresponds to the center of the plane of the sampling air cup (13). The gas flow module is arranged inside the shell (24) and in communication with the bottom of the sampling air cup (13) for measuring the gas flow and controlling the gas flow rate. The data processing and control module (22) is arranged in the shell (24) and connected to the detection module (14) for real-time processing of the detection data to obtain the gamma dose rate and alarm judgment according to whether the gamma dose rate exceeds the threshold value. The data processing and control module (22) is connected to the gas flow module for controlling the constant gas flow. The data display module (6) is arranged on the outer wall of the shell (24) and is in signal connection with the data processing control module (22), and is used for displaying various information including the gamma dose rate, alarm information and gas flow in real time.

2. The gamma dose rate aerosol sampler of claim 1, wherein, The film fixer (3) is connected to the upper cover (51) by magnetic force adsorption to press and fix the sample film (25); the upper cover (51) is provided with bolts (29) penetrating through the film fixer (3) at four corners thereof, and the bolts (29) are provided with butterfly nuts (50).

3. The gamma dose rate aerosol sampler of claim 1, wherein, The detection module (14) is vertically spaced apart from the sample film (25) by 12 mm.

4. The gamma dose rate aerosol sampler of claim 1, wherein, The gas flow module comprises a gas flow shell (15), a constant flow module (21) and a range module (20) arranged in the upper and lower parts of the gas flow shell (15) for detecting pressure signals, a gas source module (19) and a driver (16), the gas source module (19) is in communication with the lower end of the gas flow shell (15), and the driver (16) is located in the shell (24) for driving the gas source module (19) to generate a gas flow rate. The constant flow module (21), the range module (20) and the driver (16) are in signal connection with the data processing control module (22), the data processing control module (22) processes and calculates the real-time gas flow according to the detection signals of the constant flow module (21) and the range module (20), sets a flow following value, and transmits a signal to the driver (16) according to the set flow following value, so that the driver (16) controls the gas source module (19) to adjust the gas flow rate to realize constant gas flow.

5. The gamma dose rate aerosol sampler of claim 4, wherein, The shell (24) is provided with a gas source module base (18) below the gas source module (19), the gas source module base (18) is a hollow cavity with the top communicating with the gas source module (19) and the side wall being provided with an exhaust port (23) for discharging the gas flow of the gas source module (19), the gas source module base (18) is installed on the bottom plate of the shell (24), and the shell (24) is provided with exhaust holes (41) at intervals on the side wall.

6. The gamma dose rate aerosol sampler of claim 1, wherein, The shell (24) is connected with a tripod support (26) at the bottom for single soldier to hold and take samples conveniently; Or the shell (24) is connected with a rain and snow helmet (27) at the top and a table type support (28) at the bottom for open-air sampling; Or the shell (24) is installed at the top plate inside the shelter (31), the shelter (31) is provided with a sampling instrument opening corresponding to the top plate to expose the filter membrane module above the shell (24) to the outside of the shelter (31) for sampling the environment outside the shelter (31), and a rain and snow helmet module (30) is arranged outside the sampling instrument opening to shield above the filter membrane module.

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