Abstract:Abstract. We have quantified the caesium-137 in surface waters and sediments in both the Portuguese and the Spanish sections of the Tagus River over six years. This river has its source in Spain, and of its 1100 km length about 230 km are in Portugal, 43 km serving as a natural frontier between the two countries. In the two regions under study the water flow is completely regulated by a chain of dams. There are three nuclear power plants, along the Spanish section of the river that might be sources of radioact… Show more
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