According to incomplete statistics, 2.5 million victims of nuclear radiation, including 473,400 children, are currently under medical supervision in Ukraine***. Nuclear radiation has led to an increase in the incidence of thyroid cancer by more than 10 times. Large quantities of the radionuclides iodine-131 and caesium-137, which have a very long decay period, spread through the flow of air, seriously contaminating the air, soil and rivers around the site of the accident and destroying the local natural environment as well as the ecosystem. Some experts estimate that it will take another century for the consequences of the accident to be completely eliminated.
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Reference: sina chernobyl nuclear accident 20 years topic /z/Chernobyl20/