Air radioactivity sampling and monitoring device based on PIPS detector

Abstract

The invention discloses an air radioactivity sampling monitoring device based on a PIPS detector, which comprises an air sampling system, a radioactivity measuring system and a master control system, and is characterized in that the air sampling system comprises a sampling head, a filter paper feeding mechanism, a flow sensor and an air sampling module which are arranged in sequence; the radioactivity measurement system comprises a detector arranged opposite to the filter paper and a pre-amplifier connected with the detector, and the detector is used for detecting radioactivity parameters of radioactive particles enriched on the filter paper; the main control system comprises a main control module, a control unit and a multi-channel MAC module, the pre-amplifier and the flow sensor are connected with the main control module after passing through the multi-channel MAC module, and meanwhile, the main control module is connected with the filter paper feeding mechanism and the air sampling module through the control unit. The system is powerful in function and high in integration level, can monitor the radioactivity of air in real time, and has a good early warning function.

Description

Technical Field

[0001] The invention relates to the technical field of radioactivity detection, and in particular to an air radioactivity sampling and monitoring device based on a PIPS detector. Background Art

[0002] Radioactive aerosols can enter the human body through breathing, skin and other routes. Some of the radioactive substances will remain in the body, causing internal irradiation, causing damage to body cells and leading to the occurrence of radiation diseases. Radioactive aerosols are one of the most important sources of pollution hazards in nuclear workplaces, nuclear radiation terrorist incidents, and ambient air. Therefore, the protection and monitoring of radioactive aerosols are highly valued. Monitoring radioactive aerosols is necessary to evaluate the pollution status of nuclear enterprise workplaces, and is also necessary for emergency assessment of radioactive accidents and environmental impact assessments.

[0003] In recent years, people have become more and more concerned about health problems caused by environmental factors, especially radiation. Therefore, rapid sampling and measurement of the volume activity of artificial radionuclides in radioactive smoke and dust, and radioactive aerosols in the on-site environment are carried out to warn of potential internal radiation hazards. At present, there are many companies and research institutes at home and abroad that can develop and produce radioactive aerosol monitoring equipment, but there are few multifunctional products with artificial radioactive α-nuclides identification function, alarm function, continuous monitoring function, etc., which brings inconvenience to the early warning and monitoring of air radioactivity. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an air radioactivity sampling and monitoring device based on a PIPS detector to solve the problem of single function in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: an air radioactivity sampling and monitoring device based on a PIPS detector, comprising an air sampling system, a radioactivity measurement system and a main control system, wherein the air sampling system comprises a sampling head, a filter paper feeding mechanism, a flow sensor and an air sampling module arranged in sequence, the air sampling module can allow air to be inhaled by the sampling head, and after passing through the filter paper, enter the air sampling module through the flow sensor and then be discharged, wherein when the air passes through the filter paper, the radioactive particles in the air can be enriched on the filter paper of the filter paper feeding mechanism to form a measurement sample; the radioactivity measurement system comprises a detector arranged opposite to the filter paper and a preamplifier connected to the detector, the detector is used to detect the radioactivity parameters of the radioactive particles enriched on the filter paper; the main control system comprises a main control module, a control unit and a multi-channel MAC module, the preamplifier and the flow sensor are connected to the main control module after the multi-channel MCA module, and at the same time, the main control module is connected to the filter paper feeding mechanism and the air sampling module through the control unit.

[0006] As an optimization, the sampling head is connected to the flow sensor and the air sampling module in sequence through the air sampling pipeline; the filter paper feeding mechanism includes a filter paper tray arranged between the sampling head and the flow sensor, and the filter paper passes between the sampling head and the filter paper tray and separates the sampling head from the filter paper tray; under the action of the air sampling module, the air can be inhaled by the sampling head and enter the air sampling pipeline through the filter paper and the filter paper tray.

[0007] As an optimization, the filter paper feeding mechanism also includes a paper placing wheel and a paper collecting wheel and a corresponding tensioning wheel located on both sides of the filter paper tray, one end of the filter paper is wound around the paper placing wheel, and the other end bypasses one of the tensioning wheels, passes through the gap between the filter paper tray and the sampling head, and then bypasses another tensioning wheel and is wound around the paper collecting wheel, wherein the paper collecting wheel is driven to rotate by a stepper motor, and the stepper motor is connected to the main control system through a control unit.

[0008] As an optimization, a through hole is provided in the filter paper tray, and a filter is provided at one end of the through hole close to the sampling head, and the other end is connected to the air sampling pipeline.

[0009] As an optimization, the main control system also includes accessories, which include an audible and visual alarm, a display, a communication interface, a power supply unit and / or a switch component connected to the main control module.

[0010] As an optimization, the detector is a PIPS detector.

[0011] As an optimization, the air sampling module is a vacuum pump or an adjustable fan.

[0012] As an optimization, the flow sensor is an air mass flow meter.

[0013] As an optimization, the communication interface includes one or more of an RS232 communication interface, an RS485 communication interface, a CAN communication interface, and a network communication interface.

[0014] Compared with the prior art, the present invention has the following advantages: the present invention can implement rapid sampling and measurement of radioactive aerosols in the on-site environment, realize rapid calculation of the volume activity of artificial radioactive nuclides in radioactive smoke and dust, provide a reference basis for emergency response decisions, and give early warning of potential internal radiation hazards, realize the sampling, measurement and display functions of α and total β of artificial radioactive aerosols, have the function of identifying artificial α radioactive nuclides, have the function of setting α and β alarm thresholds, have the function of adjustable air sampling flow, have the function of self-checking, have the function of sound and light alarm, have the function of data storage, have the function of communicating with the host computer, etc., have powerful functions, and have good integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Example: See Figure 1, an air radioactivity sampling and monitoring device based on a PIPS detector, comprising an air sampling system, a radioactivity measurement system and a main control system, wherein the air sampling system comprises a sampling head, a filter paper feeding mechanism, a flow sensor and an air sampling module arranged in sequence, the air sampling module can make air sucked by the sampling head, and flow through the filter paper feeding mechanism and the flow sensor in sequence, and when the air flows through the filter paper feeding mechanism, the radioactive particles in the air can be enriched on the filter paper of the filter paper feeding mechanism, wherein the air sampling module is a vacuum pump or an adjustable fan. The flow sensor is an air mass flow meter. The radioactivity measurement system comprises a detector arranged opposite to the filter paper, the detector can adopt a PIPS detector of different sizes, used to detect the radioactivity parameters of the radioactive particles enriched on the filter paper, and transmit the radioactivity parameters to the multi-channel MCA module through the preamplifier; the main control system is connected to the multi-channel MCA module, and is connected to the filter paper feeding mechanism and the air sampling module through a control unit.

[0020] Specifically, the filter paper feeding mechanism includes a filter paper tray facing the sampling head, one end of the filter paper tray has a gap with the sampling head, the other end is connected to the air sampling pipeline, and the flow sensor is arranged in the air sampling pipeline. Under the action of the air sampling module, the air can be sucked in by the sampling head and enter the air sampling pipeline through the filter paper tray; a paper placing wheel, a paper collecting wheel and a corresponding tensioning wheel are arranged on both sides of the filter paper tray, one end of the filter paper is wound on the paper placing wheel, and the other end bypasses one of the tensioning wheels and passes through the gap between the filter paper tray and the sampling head, and then bypasses the other tensioning wheel and is wound on the paper collecting wheel, wherein the paper collecting wheel is driven to rotate by a stepper motor, and the stepper motor is connected to the main control system through a control unit.

[0021] A through hole is arranged in the filter paper tray, and a filter screen is arranged at one end of the through hole close to the sampling head, and the other end of the through hole is communicated with the air sampling pipeline.

[0022] The main control system includes a main control module and accessories. The main control module is connected to the multi-channel MCA module and the control unit respectively. The accessories include an audible and visual alarm, a display, a human-computer interaction switch button, an alarm switch interface, a communication interface, a power supply unit and / or a switch component connected to the main control module. The communication interface includes one or more of an RS232 communication interface, an RS485 communication interface, a CAN communication interface, and a network communication interface. The alarm switch interface can output a DC26V±4V alarm level signal, or output an alarm level signal as required. The power supply unit can be powered by a rechargeable battery or an AC mains electricity converted into DC direct current through an AC-DC module.

[0023] When working, the air radioactivity sampling monitoring device performs self-test after power-on, and uploads the self-test results to the display for display; the sound and light alarm sounds a prompt, and the monitoring device automatically enters standby mode. The monitoring device can select working states such as continuous monitoring or intermittent monitoring before entering measurement. During measurement, the air sampling module and its control unit start working, enriching the aerosol in the outside air on the filter paper to form a measurement sample.

[0024] The detector measures the sample, amplifies the signal through the preamplifier, obtains the energy spectrum and calculates the volume activity of radioactive α and β aerosols through the multi-channel MCA module, and outputs the measurement data information to the display screen through the main control module. At the same time, the measurement data information can be uploaded to the host computer through the communication interface, and an audible and visual alarm will be given when the alarm threshold is exceeded.

[0025] In summary, the present invention can implement rapid sampling and measurement of radioactive aerosols in the on-site environment, realize rapid calculation of the volume activity of artificial radioactive nuclides in radioactive smoke and dust, provide a reference basis for emergency response decisions, and warn of potential internal radiation hazards. It realizes the sampling, measurement and display functions of α and total β of artificial radioactive aerosols, has the functions of identifying artificial α radioactive nuclides, setting α and β alarm thresholds, adjusting the air sampling flow rate, self-checking, sound and light alarm, data storage, communication with a host computer, etc., and has powerful functions and good integration.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. An air radioactivity sampling and monitoring device based on a PIPS detector, characterized in that: It includes an air sampling system, a radioactivity measurement system and a main control system, wherein the air sampling system includes a sampling head, a filter paper feeding mechanism, a flow sensor and an air sampling module which are arranged in sequence, wherein the air sampling module can allow air to be sucked in by the sampling head, and then pass through the filter paper and enter the air sampling module through the flow sensor and then be discharged, wherein when the air passes through the filter paper, radioactive particles in the air can be enriched on the filter paper of the filter paper feeding mechanism to form a measurement sample; the radioactivity measurement system includes a detector arranged opposite to the filter paper and a preamplifier connected to the detector, wherein the detector is used to detect the radioactivity parameters of the radioactive particles enriched on the filter paper; the main control system includes a main control module, a control unit and a multi-channel MAC module, wherein the preamplifier and the flow sensor are connected to the main control module through the multi-channel MCA module, and at the same time, the main control module is connected to the filter paper feeding mechanism and the air sampling module through the control unit.

2. The air radioactivity sampling and monitoring device based on the PIPS detector according to claim 1 is characterized in that: The sampling head is connected to the flow sensor and the air sampling module in sequence through the air sampling pipeline; the filter paper feeding mechanism includes a filter paper tray arranged between the sampling head and the flow sensor, and the filter paper passes between the sampling head and the filter paper tray and separates the sampling head from the filter paper tray; Under the action of the air sampling module, air can be sucked in by the sampling head and enter the air sampling pipeline through the filter paper and the filter paper tray.

3. The air radioactivity sampling and monitoring device based on the PIPS detector according to claim 2 is characterized in that: The filter paper feeding mechanism also includes a paper placing wheel and a paper collecting wheel and a corresponding tensioning wheel located on both sides of the filter paper tray. One end of the filter paper is wound around the paper placing wheel, and the other end bypasses one of the tensioning wheels and passes through the gap between the filter paper tray and the sampling head, and then bypasses the other tensioning wheel and is wound around the paper collecting wheel. The paper collecting wheel is driven to rotate by a stepping motor, and the stepping motor is connected to the main control system through a control unit.

4. The air radioactivity sampling and monitoring device based on the PIPS detector according to claim 3 is characterized in that: A through hole is arranged in the filter paper tray, and a filter screen is arranged at one end of the through hole close to the sampling head, and the other end of the through hole is communicated with the air sampling pipeline.

5. The air radioactivity sampling and monitoring device based on a PIPS detector according to claim 1, characterized in that: The main control system also includes accessories, which include an audible and visual alarm, a display, a communication interface, a power supply unit and / or a switch assembly connected to the main control module.

6. The air radioactivity sampling and monitoring device based on the PIPS detector according to claim 5 is characterized in that: The detector is a PIPS detector.

7. The air radioactivity sampling and monitoring device based on a PIPS detector according to claim 5, characterized in that: The air sampling module is a vacuum pump or an adjustable fan.

8. The air radioactivity sampling and monitoring device based on a PIPS detector according to claim 5, characterized in that: The flow sensor is an air mass flow meter.

9. The air radioactivity sampling and monitoring device based on a PIPS detector according to claim 5, characterized in that: The communication interface includes one or more of an RS232 communication interface, an RS485 communication interface, a CAN communication interface, and a network communication interface.

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