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This key refers to other maps that depict the extent of contamination from the Chernobyl disaster. Interestingly, it indicates that maps of Cesium-137 distribution were much more detailed than those of Strontium-90 from the same month and year; while…

This map portrays soil contamination on the territory of Ukraine with cesium-137, a radioactive isotope, as of April 2011. Cesium-137 has a half-life of approximately 30 years (which means that 30 years after its release, half of it will have…