Xiuning County Tunnel Civil Air Defense Air Radiation Monitoring Instrument

1、 Equipment Overview

Air radioactive monitoring device is a specialized instrument used for real-time collection and analysis of radioactive nuclide concentrations in the air. It is mainly used for environmental monitoring around nuclear facilities, emergency response to nuclear accidents, safety supervision of radioactive material transportation, and public health protection. The device collects air particulate matter and aerosols through active sampling or passive adsorption, combined with high-sensitivity detectors to achieve accurate detectionalphaTheB、γThe rapid identification and quantitative analysis of X-rays have the characteristics of high measurement accuracy, fast response speed, and high degree of automation.Xiuning County Tunnel Civil Air Defense Air Radiation Monitoring Instrument

2、 Core technical parameters

1. Detection type：

oalphaRadiation: Energy Range3MeV-10MeVDetection efficiency≥35%(Yes)239PuStandard source)

oBRadiation: Energy Range0.1MeV-3MeVDetection efficiency≥45%(Yes)90Sr-90YStandard source)

oγRadiation: Energy Range50keV-3MeVEnergy resolution≤8%(Yes)60Co 1.332MeVγRadiation)

2. Sampling performance：

oSampling traffic:50-500L/minContinuously adjustable, flow stability≤±2%

oEffective sampling area:≥100cm²(Filter membrane diameter)47mmStandard configuration)Xiuning County Tunnel Civil Air Defense Air Radiation Monitoring Instrument

oSampling period:1-120Minute programmable settings

3. data processing：

oNuclide recognition capability: built-in≥200Seed nuclide library, supporting automatic matching and manual review

oDetectable limit（MDL）：

§Aerosol totalalpha：≤0.1Bq/m³（24Hourly sampling)

§Aerosol totalB：≤0.5Bq/m³（24Hourly sampling)

§137Cs：≤0.01Bq/m³（1Hourly sampling)

oData storage capacity:≥10Ten thousand sets of measurement data, supportingUSB/Ethernet export

3、 Working principle

1. sampling systemUsing a combination of cyclone separation and membrane filtration technology, the air is pre treated to remove large particles, and then passes through a nuclear pore membrane at a constant flow rate through a quantitative pump. Radioactive aerosols are trapped on the surface of the membrane.

2. detection system：

oa/bDetection: using a large areaZnS(Ag)Composite detector of scintillator and plastic scintillator, achievinga/bSimultaneous measurement of radiation

oγDetection: Configure high-purity germanium detector（HPGe）OrNaI(Tl)Scintillation detector combined with multi-channel pulse analyzer（MCA）Implement energy spectrum analysis

3. signal processingAfter the detector output pulse is pre amplified, shaped and filtered, it is processed byADCConvert to digital signal, throughFPGAReal time processing to achieve baseline recovery and pulse accumulation correction, ultimately throughγThe energy spectrum analysis algorithm completes nuclide identification and activity calculation.

4、 Main functional features

1. Intelligent monitoring modeSupports three working modes: continuous monitoring, timed monitoring, and triggered monitoring. The measurement duration can be automatically adjusted according to the environmental background

2. Multi parameter alarmEquipped with functions such as nuclide concentration exceeding the standard alarm, detector failure alarm, sampling flow abnormal alarm, etc., supporting sound and light alarm and network push

3. remote monitoring: Integration4G/WiFiModule, supportsWebReal time monitoring on both mobile and mobile devices, with the ability to remotely configure parameters and upgrade firmware

4. environmental adaptability: Working temperature-10℃~50℃Relative humidity≤95%(No condensation), meeting the dual needs of field and laboratory scenarios

5、 Application scenarios

1. Conventional monitoring of nuclear facilitiesContinuous monitoring of the surrounding environment of nuclear power plants, nuclear reactors, and radioactive waste treatment plants

2. Nuclear emergency responseRapid deployment monitoring during sudden nuclear accidents to obtain dynamic data on the spread of radioactive smoke clouds

3. Entry-Exit Inspection and QuarantineScreening for illegal transportation of radioactive materials in ports, airports, and other places

4. scientific research experimentInvestigation of Environmental Radioactive Background and Study on the Migration Law of Radioactive Aerosols

5. public safetySecurity for large-scale events and monitoring of radioactive threats in key areas