Acta Facultatis Ecologiae - Technická univerzita vo Zvolene

1272.52.0Correlation coefficient 0,72Number of points 82y = 0,2005x + 0,1026R 2 = 0,5093210 Pb [mBq.m-3 ]1.51.00.50.00.0 2.0 4.0 6.0 8.0 10.0 12.0222 Rn [Bq.m -3 ]Fig. 2 Correlation between air activity of 222 Rn and 210 Pb in a week periodTab. 1 Correlation coefficients between air activityconcentrations of radionuclides and meteorological parametersAir temperature Air pressure Air humidity Precipitation222Rn (week period) –0.19 0.44 0.31 –0.22222Rn (month period) –0.28 0.57 0.41 –0.42210Pb (week period) –0.31 0.37 0.14 –0.36210Pb (month period) –0.38 0.48 0.50 –0.39CONCLUSIONThe concentrations of gaseous 222 Rn and 210 Pbin the ground level of atmosphere indicate seasonalvariations in Bratislava region. Correlation coefficientsbetween radionuclides were found 0.72 fora weekly period and 0.88 for a monthly period. Thehigh coefficients prove relations between 222 Rn and210Pb in air at the ground level of the atmosphere.The concentrations of 222 Rn and 210 Pb ranged from0.59 to 11.1 Bq.m –3 with average 3.73 ± 0.17 Bq.m –3and from 0.22 to 2.37 mBq.m –3 with average0.83 ± 0.02 mBq.m –3 , respectively. These are typicalvalues of air activity concentrations of 222 Rn and210Pb for the European area [7–9]. The correlationstudy between air concentrations of radionuclidesand meteorological parameters was carried out andshows correlation between temperature and concentrationof radon in summer months.AcknowledgementThe authors acknowledge to the grants of theMinistry of Education of the Slovak Republic(VEGA project No. 1/3046/06, ESF project JPDBA 3 2005/1-034) and Comenius University inBratislava (Grant of Juniors UK/369/2007).REFERENCES1. AHMED, A. A., MOHAMED, A., ALI, A. E.,BARAKAT, A., ABD EL–HADY, M., EL–HUSSE-IN, A. Seasonal variations of aerosol residence timein the lower atmospheric boundary layer. Journal ofEnvironmental Radioactivity 77 (2004), 275–283.2. HOLÝ, K., BOSÁ, I., BÖHM, R., POLÁŠKOVÁ, A.,HOLÁ, O. Analysis of the daily 222 Rn courses in thesurface layer of the atmosphere. 3. Banskoštiavnickédni 2001, (Conf. proc. Banská Štiavnica, 2001),(2001) 105–118.3. HOLÝ, K., BOSÁ, I. , POLÁŠKOVÁ, A., BÖHM,R., HOLÁ, O., ONDO-EŠTOK, D. Ten years of continualmonitoring of 222 Rn concentration in Bratislava