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http://hdl.handle.net/123456789/2093
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| Title: | T HORON C OMPONENT OF ATMOSPHERIC R ADON |
| Authors: | Yared, Tesfaye |
| Advisors: | Dr. Tilahun Tesfaye |
| Keywords: | physics |
| Copyright: | Aug-2007 |
| Date Added: | 2-May-2012 |
| Publisher: | aau |
| 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 β 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 222 Rn and EEC (equilibrium equivalent
concentration) of 222 Rn was done by fitting the observed gross β count to a mathematical
model derived.
The indoor and outdoor variation of
222
Rn was observed inside and outside
of the nuclear physics laboratory (around four meters above the ground).
The average EEC of
222
Rn 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. |
| URI: | http://hdl.handle.net/123456789/2093 |
| Appears in: | Thesis - Physics
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| 15 | | 1.74 MB | Adobe PDF | View/Open |
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