Measuring Radon Concentration using Filtered air Samples
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Date
2006-07
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Addis Ababa University
Abstract
Suction pump was used to pass a known volume of air through Whatman glass
fiber filter (> 90 % filtration efficiency). Aerosols deposited on the filter were placed
under end-window GM tube with in a minute after the end of sampling, and gross
β- count was recorded for successive intervals of time over a period of 7 to 10
hours. The activity concentration of radon daughters was determined by fitting
the observed gross β- count to a mathematical model. The diurnal variation of
EEC of 222Rn and 220Rn in the nuclear physics lab was observed.
It was found that the highest EEC was during the morning hours and the
lowest in the afternoon. The daily average equilibrium equivalent concentrations
were 23.9 Bq/m3 and 5.2 Bq/m3 for 222Rn and 220Rn respectively
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Measuring Radon Concentration