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UP: Fachverband Umweltphysik
UP 4: Postersession
UP 4.17: Poster
Tuesday, February 26, 2013, 17:15–18:30, Poster EG
Washout Coefficients for Particle Bound Radionuclides in Rain and Snow Events — •Felix Bernauer, Kerstin Huerkamp, and Jochen Tschiersch — Helmholtz Zentrum München, Department of Radiation Sciences, Munich, Germany
For the removal of particle bound radionuclides and aerosol particles in general wet deposition processes play a key role. Supposing that wet deposition depends strongly on the type and characteristics of the precipitation event we present field experiments on the quantification of wet deposition of radionuclides by snowfall and rain events. The experiments take place in the free atmosphere at the Environmental Research Station Schneefernerhaus on Mt. Zugspitze (2650m a.s.l.). Snowfall event characterization, quantification of the washout of aerosol particles in the size range from 10−2µm to 10µm and determination of the overall activity washout coefficient for the radionuclides 7Be, 137Cs and 210Pb are the key tasks in our experiments. A 2D Video-Distrometer (Joanneum Research), a high volume aerosol sampling station ASS1000 (Fischer, PTI), an electrical low pressure cascade impactor ELPI+ (Dekati) and a low-level background gamma spectrometer (Canberra Broad Energy Germanium Detector) make these parameters accessible and software tools for data handling and processing will be developed. First results on precipitation event characterization are shown. Relating the radioactivities in the freshly fallen snow and rain to those in the collected aerosol allows us to quantify the washout efficiency for different precipitation events.