Indoor and Outdoor Variation of Radon Concentration
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Date
2007-08
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Addis Ababa University
Abstract
Suction pump was used for air to pass through a glass filter (> 90% filtration
efficiency) and aerosols were deposited on it. The sampled filter was placed below a
GM tube (with GM nuclear counter) within a time interval of less than one minute
after sampling, and gross ¯ counts were registered in successive time interval for
more than six to ten hours. Determination of activity concentration of progenies of
222Rn and EEC (equilibrium equivalent concentration) of 222Rn was done by fitting
the observed gross ¯ count to a mathematical model.
The indoor and outdoor variation of 222Rn was observed inside and outside
of the nuclear physics laboratory (around four meters above the ground).
The average EEC of 222Rn was found to be 23.9 Bq=m3 and 3.74 Bq=m3 for indoor
and outdoor respectively.
Indoor radon concentration is 4 to 6 times higher than the outdoor. Our
result agrees with the results available in other studies
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Keywords
Radon Concentration