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Danube River Drainage-Catchment Basin, by Shannon via wikimedia

The Chernobyl-derived Pu in the Danube Delta sediments evidently originates from non-volatile actinides deposited into the Danube catchment basin during April-May 1986, followed by erosion and fluvial transport to the Black Sea.” From the below article, which is available to the public due to both the hard work of the researchers and their generosity in paying a fee to make it open-access.
Fluvial Transport of Chernobyl Plutonium to the Black Sea, 2010Ketterer et. al., 2010, p. 198Ketterer et. al., 2010, p. 199 Ketterer et. al., 2010, p. 200Ketterer et. al. 2010, p. 201

Through Open Access Plus, authors of accepted papers are given the option of paying an open access publication charge to make their paper freely available online immediately via the journal website, meaning that readers will not need a journal subscription to view open access content. If an author does not choose to pay the open access publication charge, their article will be published with the standard subscription-based access at no cost. Open access plus articles will be clearly indicated on the journal’s online contents page“(Benthamscience. com). This means that not only did the authors do the research and writing for us but they were generous enough to pay a fee so that everyone can read it for free!
See original article in pdf form here: http://www.benthamscience.com/open/tocbmj/articles/V003/SI0133TOCBMJ/197TOCBMJ.pdf