MONITORING OF 7Be ATMOSPHERIC ACTIVITY CONCENTRATION USING SHORT TERM MEASUREMENTS

The activity concentration of Be-7 in atmospheric aerosol can exhibit seasonal variations due to various physical processes taking place in the troposphere and stratosphere, as well as due to solar activity. An investigation of these variations has been carried out at the Nuclear Engineering Department of the National Technical University of Athens over a two year period (3/2008-4/2010). In the framework of this study, sampling and analysis methods were appropriately selected to allow for the observation of short-term Be-7 air activity concentration variations, using a 4-hour sampling interval, while taking in consideration type A and type B uncertainties introduced in the measurements. In order to study the role of precipitation in surface air Be-7 activity concentration variations, a procedure for collecting and analyzing rainwater was developed. The techniques used in the present study allowed for the observation of seasonal and diurnal Be-7 concentration variations, as well as correlations between Be-7 activity concentration and the meteorological parameters of air temperature and relative humidity.