Radioactive ruthenium from an undeclared major nuclear release in 2017
A few years ago a professor from the Miami University in Ohio came to our institution to give a talk about her students accidentally found high levels of radiation in a valley nearby. After some investigation they tracked down the source of radiation to a factory that prepared nuclear raw materials during the cold war. Some of the radiating dusts got carried by the wind and affected a region of tens of miles down in the valley. Apparently the locals in the valley town are not informed and the cancer rate is relatively high in the town. For some reason their papers on this are rejected, and calls for a public investigation were buried. I am not sure what the situation is now, but it would not be too difficult to contact some faculties of environmental sciences in that university if anyone is interested.