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|Title: ||THORON COMPONENT OF ATMOSPHERIC RADON|
|Authors: ||Yared, Tesfaye|
|Advisors: ||Dr. Tilahun Tesfaye|
|Copyright: ||2007 |
|Date Added: ||9-Nov-2007 |
|Publisher: ||Addis Ababa University|
|Abstract: ||Air was sampled by the use of suction pump through a glass filter (> 90% filtration
efficiency) and aerosols were deposited on the glass-fiber filter. The aerosol deposited
on the filter paper was placed below a GM tube (with GM nuclear counter) within a
time interval of less than one minute after the end of sampling. The gross ¯ counts
were registered in successive time intervals for more than six to ten hours (i.e. in
intervals of 1 min for the first one hour; 2 min for the second hour; 4 min for the
third hour etc.)
The activity concentration of progenies of 222Rn and EEC (equilibrium equivalent
concentration) of 222Rn was done by fitting the observed gross ¯ count to a mathematical
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 3.4 Bq=m3 for indoor
and outdoor respectively.
Indoor radon concentration is 4 to 6 times higher than the outdoor concentration.
Our result agrees with the results available in other studies.|
|Description: ||A THESIS PRESENTED TO
THE SCHOOL OF GRADUATE STUDIES
ADDIS ABABA UNIVERSITY
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS
FOR THE DEGREE MASTER OF SCIENCE in PHYSICS|
|Appears in:||Thesis - Physics|
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