| NUKLEONIKA 2010, 55(4):439-444
FIRST RESULTS OF MEASUREMENTS OF EQUILIBRIUM FACTORS F
AND UNATTACHED FRACTIONS fp OF RADON PROGENY
IN CZECH DWELLINGS
Karel Jílek1, Josef Thomas1, Ladislav Tomášek2
1 National Radiation Protection Institute, 28 Bartoškova Str., Praha 4-140 00, Czech Republic
2 Institute of Computer Science, Academy of Sciences of the Czech Republic,
28 Bartoškova Str., Praha 4-140 00, Czech Republic
The unattached fraction of radon decay product clusters fp and equilibrium factor F are dose relevant parameters in all dosimetric approaches to dose calculation. In the past, three year continuous weekly measurements of unattached and attached activity of radon daughter product and air exchange rate were carried out during heating season in 30 occupied typical Czech family houses. The results indicated significantly different weekly averages of equilibrium factor F and fp for houses located in towns compared those in villages. Due to this fact, approximately a 10% average increase of equivalent lung dose rate was estimated in the detriment in towns. Average values of equilibrium factor F and fp were 0.40 and 8.6% in urban houses and 0.32 and 10.7%, respectively in rural houses. Based on the measurements of mean values of fp, average effective dose conversion factors (DFC) in units of mSv per working level month (WLM) were estimated to be 15.0 mSv/WLM in urban houses and 15.9 mSv/WLM in rural houses, respectively.
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