Yao'an County Tunnel Civil Air Defense Radioactive Monitoring Instrument

1、 Instrument Overview

Air radioactive monitoring device is a specialized equipment used for real-time monitoring of the concentration of radioactive nuclides in the air. It is widely used in environmental monitoring around nuclear facilities, emergency response to nuclear accidents, safety supervision of radioactive material transportation, and public health protection. This device can quickly identify by collecting air samples and conducting radioactive activity analysisalphaTheB、γDifferent types of radiation have the characteristics of high sensitivity, fast response speed, and high degree of automation, providing key data support for radioactive pollution prevention and control.Yao'an County Tunnel Civil Air Defense Radioactive Monitoring Instrument

2、 Core technical parameters

1. Detection type: SupportalphaParticles (energy range)3MeV-10MeV）TheBParticle（0.1MeV-3MeV）AndγRadiation（0.05MeV-3MeV）Joint detection to meet the needs of multidimensional radioactive contamination assessment

2. Detectable concentration：alphanuclide≤0.1Bq/m³，Bnuclide≤1Bq/m³，γnuclide≤0.1μSv/h(Under typical sampling flow)Yao'an County Tunnel Civil Air Defense Radioactive Monitoring Instrument

3. sampling flow：50-500L/minAdjustable, standard configuration200L/minEfficient sampling pump ensures sample representativeness per unit time

4. Data response timeIn real-time monitoring mode≤10Second, in cumulative analysis mode≤5Minutes, emergency mode can activate rapid analysis algorithm (response time)≤30Seconds)

5. energy resolution：γray@662keV（Cs-137）≤8%，alpharay@5.486MeV（Am-241）≤15%Ensure the accuracy of nuclide identification

6. working environment: Temperature-20℃~50℃, humidity0%-95%(No condensation), suitable for complex outdoor and industrial scenes

3、 Working principle

The instrument adopts'sampling-separation-detect-analyze'Integrated process:

1. Air sampling moduleCapture aerosol particles in the air through an inertial impact sampling head, enrich them through a filter membrane, and send them to the sample pretreatment unit

2. Radioactive separation：利用BMeasure aerosol mass concentration using X-ray absorption method, and simultaneously transfer the sample toa/bDetector andγspectrometer

3. Multi mode detection：

oa/bDetection: Using a large-area thin window flow proportional counter tube to achievealphaTheBSimultaneous identification and counting of particles

oγDetection: Configure high-purity germanium detector（HPGe）OrNaI(Tl)Scintillation detector, identifying features through spectral analysisγray

4. data processing systemBased on pulse amplitude analysis technology and combined with nuclide feature database, automatically match the types of radioactive nuclides (such asCs-137TheI-131TheCo-60Calculate activity concentration and generate dose rate evaluation results