Showing papers by "Russian Ministry of the Emergency Situations published in 2002"

Modeling radionuclide effluxes from agricultural and natural ecosystems in Belarus.

Abstract: A mathematical model is described which is appropriately constructed to calculate effluxes of radionuclides from agricultural and natural ecosystems. The application of this model is demonstrated by estimating effluxes in the Bragin region and in the Narovlya region in the Republic of Belarus both highly affected by the Chernobyl accident fallout. Depending on the nature of the area and the deposition, the total efflux and the exported radioactivity are calculated. It is shown that the exported radioactivity for natural foodstuffs represents more than 64% (Bragin region) and 86% (Narovlya region) of the total 137 Cs efflux, and for agricultural products 2.7% and 2.3%, respectively. The contribution of the different foodstuffs deriving from natural and agricultural used land to the individual and collective dose for 137 Cs and 90 Sr are estimated and presented. In the Bragin region for the collective annual dose the highest contribution is due to milk and meat consumption ( 137 Cs) and flour and milk ( 90 Sr), for individual annual dose milk and mushrooms ( 137 Cs), and milk and flour ( 90 Sr) contribute most. In the Narovlya region this contribution for the collective and individual annual dose is due to milk and mushroom consumption ( 137 Cs) and flour and milk ( 90 Sr).