Research on the Method for Determining the Filtration Efficiency of Aerosol Filter Membranes by Natural Radionuclides
When using a double-layer filter membrane to collect aerosols,the natural radioactive nuclide activity in the upper and lower layers of the filter membrane is different,and the filtration efficiency of the aerosol filter membrane is measured.Determine the advantages of the research objects 7Be and 210Pb based on their natural nuclide properties;By measuring the activity of radioactive nuclides in different areas of the single-layer filter membrane,the overall relative standard deviation of the uniformity of the filter membrane sampling process was verified to be less than 8.0％;By utilizing the principle of double-layer membrane filtration,the filtration efficiency was determined.The calculated filtration efficiencies for 7Be and 210Pb were 82.3％and 80.8％,which were significantly lower than the manufacturer's nominal values.Therefore,it is necessary to consider the actual filtration efficiency correction during radioactive analysis.
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