CN-116466386-B - Plug-in card type radioactive aerosol monitor

CN116466386BCN 116466386 BCN116466386 BCN 116466386BCN-116466386-B

Abstract

The invention relates to the field of nuclear radiation monitoring and protection, and provides a plug-in card type radioactive aerosol monitor which comprises a plug-in card type aerosol detection device, a signal processing and expanding unit, an electric control unit, a terminal display and communication expanding unit, a differential pressure sensor and a sampling system, wherein the differential pressure sensor is connected with two ends of the plug-in card type aerosol detection device in parallel, the signal processing and expanding unit processes an aerosol detector signal and a flow signal, identifies radioactive aerosol nuclides, calculates characteristic nuclide activity concentration of each corresponding energy interval, the electric control unit acquires differential pressure and flow information, performs a control function of an air pump in the sampling system and prompts a user of the use state of filter paper. The invention has the advantages of convenient operation, high efficiency, easy maintenance, quick measurement response, strong nuclide identification capability, natural radon and thorium daughter compensation function, real-time retention of representative samples after monitoring and finding abnormality, and good comparability of sampling analysis results and real-time monitoring values.

Inventors

ZHANG GUOQING
WANG YIYUAN
CHEN XIANGLEI
LIN CHANGYONG
WAN XINFENG
HUANG XINJIE
JIN TAN
FAN LEI
WU JING
YAN YANGYANG
CHENG FANGQUAN

Assignees

中广核工程有限公司
中国船舶集团有限公司第七一九研究所

Dates

Publication Date: 20260505
Application Date: 20230329

Claims (11)

1. The plug-in type radioactive aerosol monitor is characterized by comprising a plug-in type aerosol detection device, a signal processing and expanding unit, an electric control unit, a terminal display and communication expanding unit, a differential pressure sensor and a sampling system, wherein the differential pressure sensor is connected in parallel with two ends of the plug-in type aerosol detection device, the differential pressure sensor monitors the differential pressure of two ends of aerosol filter paper in real time, a mass flowmeter in the sampling system measures sampling flow in real time, the signal processing and expanding unit processes an aerosol detector signal and a flow signal, identifies radioactive aerosol nuclides, calculates the characteristic nuclide activity concentration of each corresponding energy interval, and the electric control unit acquires the differential pressure and flow information, executes the control function of an extraction pump in the sampling system and prompts the use state of the filter paper; the plug-in card type aerosol detection device comprises an aerosol detector and an aerosol sampling device, wherein the aerosol detector comprises a PIPS or CdZnTe, a charge sensitive pre-amplifying circuit, an electric connector and a multi-arm collimation device, the PIPS or CdZnTe is arranged in a differential mode, the area and the shape of a sensitive area are combined and expanded according to requirements, the multi-arm collimation device is close to the front of the aerosol detector, the arm length and the arm number are adjusted according to different application requirements, the aerosol sampling device comprises an air inlet, a shell, filter paper, a filter paper card holder, a lifting arm, a reset spring, an air outlet pipe fitting and a paper changing base, the shell is in sealing connection with the paper changing base, an airtight coaxial connector is arranged at the upper end cover of the shell, an air inlet is an air flow channel, the air inlet is welded outside the shell and is communicated with a sampling cavity inside the shell, and the multi-arm collimation device, the PIPS or CdZnTe in the aerosol detector, the charge sensitive pre-amplification circuit boards are sequentially packaged together and are arranged in the shell, the lifting arm is connected with the paper changing base through a bearing, the connecting part of the lifting arm and the bearing is of an eccentric cam structure, the lower part of the air outlet pipe fitting is sleeved with a spring fixing seat, a reset spring is sleeved outside the spring fixing seat, the spring fixing seat is connected to the bottom end of the paper changing base, the reset spring keeps a certain compression amount, a single Zhang Lvzhi is arranged on the filter paper clamping support, the cam acts on the air outlet pipe fitting when the lifting arm is pressed, the air outlet pipe fitting compresses the reset spring, the filter paper clamping support between the upper end of the air outlet pipe fitting and the lower end of the shell is separated, and the filter paper clamping support is convenient to take out and insert.
2. The plug-in card type radioactive aerosol monitor of claim 1, wherein the filter paper card holder is made of stainless steel, a honeycomb structure is arranged in the central area, the filter paper card holder is supported and does not block air flow, the filter paper card holder is nested in the silica gel sealing member, the air outlet pipe fitting is pushed out when the reset spring is reset, and the air outlet pipe fitting compresses the silica gel sealing member to the bottom end of the sampling cavity in the shell, so that air path sealing is realized.
3. The card type radioactive aerosol monitor of claim 1, wherein the aerosol detector in the card type aerosol detection device has an acid-proof configuration and is suitable for long-term use in an acid gas environment.
4. The card type radioactive aerosol monitor of claim 1, wherein the aerosol detector in the card type aerosol detection device has the functions of energy spectrum measurement and natural radon-thorium daughter compensation, and can identify artificial alpha-radioactive U-235, U-238, pu-239, am-241 or Po-210 nuclides.
5. The plug-in card type radioactive aerosol monitor as set forth in claim 1, wherein the signal processing and expanding unit is provided with multichannel signal high-speed real-time full-waveform acquisition, parallel data processing and conversion, algorithm based on energy spectrum analysis technology calculates radionuclide aerosol activity concentration corresponding to each energy interval in real time, data storage and query functions of expandable capacity are provided, and standard MODBUS protocol and TCP/IP protocol are supported.
6. The plug-in card type radioactive aerosol monitor of claim 1, wherein the electronic control unit is connected with the terminal display and communication expansion unit, the air pump, the mass flowmeter and the differential pressure sensor, the electronic control unit collects operation state parameters of the system, the receiving terminal displays man-machine interaction instructions of the communication expansion unit and sends out corresponding execution commands, the air pump is controlled to start and stop and automatically operate, and receives feedback signals, and the mass flowmeter and the regulating valve are controlled to automatically regulate the opening of the valve according to the set value sending instructions, so that the flow is stabilized at the set value.
7. The plug-in card type radioactive aerosol monitor as set forth in claim 1, wherein the sampling system comprises a regulating valve, a mass flowmeter, a gas sampling port, a vacuum release valve and a suction pump, the regulating valve and the mass flowmeter are configured as an integrated electric flow controller with a feedback function, the suction pump is controlled by an electric control unit to provide sampling power for the monitor, a pressure relief protection valve is arranged at an inlet end of the suction pump, and the pressure relief protection valve is adjustable in one-way opening pressure.
8. The plug-in card type radioactive aerosol monitor as set forth in claim 1, wherein the terminal display and communication expansion unit interface displays parameters, status indication and alarm information of 16 channels including activity concentration, flow, pressure difference and pumping status, the communication expansion function realizes remote interaction and backup of all measurement information of the monitor, and performs parameter reading and configuration of the signal processing and expansion unit and the electric control unit, wireless communication expansion and subsystem networking.
9. The plug-in type radioactive aerosol monitor as set forth in claim 1, wherein the plug-in type radioactive aerosol monitor is integrated into an open rack, or integrated into a cabinet, or a box, or a split module, and is installed in a floor type, or a wall hanging type, or a vehicle-mounted type, or an airborne type or a carrier-mounted type.
10. The plug-in type radioactive aerosol monitor of claim 1, wherein the plug-in type radioactive aerosol monitor is configured as an airtight conventional type and a airtight type, the conventional type complete machine meets the leakage rate of not more than 10 -3 Pa·m 3 /s, and the airtight type complete machine meets the leakage rate of not more than 10 -8 Pa·m 3 /s and covers different application requirements.
11. The card-inserted radioactive aerosol monitor as set forth in claim 1, wherein the filter paper used by the card-inserted radioactive aerosol monitor is marked with a bar code or a two-dimensional code as a unique identification code, and the bar code or the two-dimensional code can be recorded by a scanning module arranged outside the signal processing and expanding unit when the card-inserted radioactive aerosol monitor is used, measurement data is automatically stored under a catalog corresponding to the filter paper, and the filter paper supports dual functions of continuous on-line monitoring and sampling monitoring.

Description

Plug-in card type radioactive aerosol monitor Technical Field The invention relates to the field of nuclear radiation monitoring and protection, in particular to a plug-in card type radioactive aerosol monitor. Background Various artificial radioactive materials are present in the nuclear-related site operation and the nuclear-related process gaseous effluent stream, which enter the atmosphere to form artificial radioactive aerosols and have specific aerodynamic properties. The artificial radioactive aerosol is settled on the surface of the staff to form external irradiation, and is inhaled into a respiratory system to generate internal irradiation hazard, and is leaked or discharged into the atmosphere to generate irradiation damage to the contacted public. Therefore, the activity concentration of artificial radioactive substances in the gaseous effluent streams of the nuclear related places and the nuclear related processes needs to be monitored so as to ensure that the air quality of the personnel activities reaches the standard and ensure the safety of staff and the public. The radioactive aerosol monitor widely used at present generally adopts a filter paper belt mode, samples are shifted for measurement after on-line monitoring or sampling for a period of time, and the sampling analysis adopts a single Zhang Lv paper sheet for volume or time sampling and then laboratory physicochemical analysis is carried out. The equipment has the problems that the response time is long generally, a representative sample cannot be obtained quickly after the abnormality is detected by monitoring, or the analysis result of periodic routine sampling cannot be compared with a real-time monitoring value. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides the plug-in type radioactive aerosol monitor which can simultaneously monitor and sample radioactive aerosol, has good comparison between a sampling analysis result and a monitoring result, and is simple and convenient to operate and low in failure rate. The object of the invention is achieved by the following technical measures. A plug-in type radioactive aerosol monitor comprises a plug-in type aerosol detection device, a signal processing and expanding unit, an electric control unit, a terminal display and communication expanding unit, a differential pressure sensor and a sampling system, wherein the two ends of the plug-in type aerosol detection device are connected with the differential pressure sensor in parallel, the differential pressure sensor monitors the differential pressure of two ends of aerosol filter paper in real time, a mass flowmeter in the sampling system measures sampling flow in real time, the signal processing and expanding unit processes aerosol detector signals and flow signals, identifies radioactive aerosol nuclides, calculates characteristic nuclide activity concentration of each corresponding energy interval, the electric control unit acquires the differential pressure and flow information, performs the control function of an extraction pump in the sampling system, prompts the use state of filter paper, the plug-in type aerosol detection device comprises an aerosol detector, an aerosol sampling device, the aerosol detector comprises a PIPS (passive ion implantation planar silicon detector) or a CdZnTe (tellurium zinc chromium detector), a charge sensitive pre-amplifier circuit, an electric connector and a multi-arm device, the PIPS or the CdZnTe differential detector is arranged, the plug-in differential type aerosol detector can be combined with a filter paper sensor, a sensor can be mounted on an air inlet, a sensor can be mounted on a base, a filter paper can be mounted on a sealed and a base, a plurality of filter paper can be combined with an air-filled with the filter paper, the plug-in a base can be combined with the base, the base can be combined with the base can be sealed by a sealed, the base can be combined with the base can be adjusted by the base, and the base can be combined with the base can be adjusted by the requirements of the base, and the base can be sealed by the base, and the base can be sealed, and the filter can be used by the base. The lower opening is the gas flowing channel, and the air inlet welding is outside the casing, communicates with the inside sampling cavity of casing, multiarm collimation device, PIPS or CdZnTe, charge sensitive pre-amplification circuit board pack together in proper order in the aerosol detector, arrange in the casing, the lifting arm passes through the bearing and trades paper base connection, and the lifting arm is eccentric cam structure with the bearing junction, it has the spring fixing base to go out gas pipe fitting lower part cover, and the spring fixing base overcoat has reset spring, and the spring fixing base is connected to trades paper base bottom, makes reset spring keep certain compression volume, and single Zhang Lvzhi is arra