137Cs in the Ground Level Air and Deposition in the Ignalina Nuclear Power Plant Region

Physics

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Environmental Studies

Scientific paper

Results of 137Cs activity concentration measurements in the ground level air and deposition at the station of the Institute of Physics situated 3.5 km from the Ignalina Nuclear Power Plant (Ignalina NPP), Lithuania, in 2002-2006 are analyzed. 137Cs atmospheric depositional fluxes are estimated, and particle deposition rates are calculated. Results on solubility in water of atmospheric aerosols - carriers of 137Cs - are discussed. The Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model of the global dispersion and deposition is used to explain increases in 137Cs activity concentration in the ground-level air and deposition in the Ignalina NPP region. Modelling results show that the Chernobyl NPP Unit 4 Sarcophagus can be a source of 137Cs to the environment of the Ignalina NPP.

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