Radiation hotspots of Cesium-137 in 1996 resulting from the Chernobyl nuclear power plant accident.
http://www.lib.utexas.edu/maps/belarus.html, specifically http://www.lib.utexas.edu/maps/commonwealth/chornobyl_radiation96.jpg and File:Tchernobyl_radiation_1996.svg for the vector version
CIA Factbook, Sting (vectorisation), Mohammad Kamal Shady (Arabic Translation)