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KMID : 0364920000250040207
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Journal of Radiation Protection and Research
2000 Volume.25 No. 4 p.207 ~ p.216
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Diurnal and Seasonal Variations of the Radon Progeny Concetrations in the open Atmosphere and the Influence of Meteorological Parameters
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Lee, Dong-Myung/이동명
Kim, Chang-Kyu/Rho, Byung-Hwan/Lee, Seung-Chan/Kang, Hee-Dong/김창규/노병환/이승찬/강희동
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Abstract
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Continuous measurements of radon progeny concentrations in the open atmosphere and measurements of meteorological parameters were performed in Tajeon, using a continuous gross alpha/beta aerosol monitor and a weather measuring equipment between July 1999 and July 2000. These data were analyzed for half-hourly, daily, and seasonal variations. The distribution of daily averaged equilibrium equivalent radon concentration(EEC_(Rn)) had an arithmetic mean value of 11.8±5.86 Bqm^(-3) with the coefficient of variation of about 50 % and the geometric mean was 10.3 Bqm^(-3). The EEC_(Rn) varies between 0.83 and 43.3 Bqm^(-3), depending on time of day and weather conditions. Half-hourly averaged data indicated a diurnal pattern with the outdoor EEC_(Rn) reaching a maximum at sunrise and a minimum at sunset. The pattern of the seasonal variation of the EEC_(Rn) in Taejon had a tendency of minimum concentration occurring in the summer(July) and maximum concentration occurring in the late autumn(November). But the seasonal variation of the EEC_(Rn) is expect to vary greatly from place to place. The outdoor EEC_(Rn) was highly dependent on the local climate features. Particularly the EEC_(Rn) rapidly drops less than 5 Bqm^(-3) in case of blowing heavily higher than wind speed of 6 msec^(-1), reversely the days with more than 30 Bqm^(-3) were at a calm weather condition with the wind speed of lower than 1 msec^(-1).
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