Measuring Radon Concentration Using Filtered Air Samples

Suction pump was used to pass a known volume of air through Whatman glassrnfiber filter (> 90 % filtration efficiency). Aerosols deposited on the filter were placedrnunder end-window GM tube with in a minute after the end of sampling, and grossrnβ- count was recorded for successive intervals of time over a period of 7 to 10rnhours. The activity concentration of radon daughters was determined by fittingrnthe observed gross β- count to a mathematical model. The diurnal variation ofrnEEC of 222Rn and 220Rn in the nuclear physics lab was observed.rnIt was found that the highest EEC was during the morning hours and thernlowest in the afternoon. The daily average equilibrium equivalent concentrationsrnwere 23.9 Bq/m3 and 5.2 Bq/m3 for 222Rn and 220Rn respectively

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