Ukraine appeared in the list because of the land around Chernobyl nuclear
plant. One major reason for the concern is that though an enormous amount of
radiation was released during the disaster, most of the radioactivity remained
trapped within the plant itself.
Some estimate that more than 100 tons of uranium and other radioactive products, such as plutonium, remain to be released if there is another accident. Chernobyl is also thought to contain some 2,000 tons of combustible materials. Leaks in the structure lead experts to fear that rainwater and fuel dust have formed a toxic liquid that may be contaminating the groundwater.
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