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Chernobyl reactor 4
Chernobyl Nuclear power station is located in Ukraine, but in 1986 was under Soviet Union control.
An explosion happened on 26 April 1986, and tonnes of radioactive matter spread out across the area, and across the world.
Three main radioactive isotopes that came from the blast were:
Click the links for more information about these isotopes.
Nuclear fallout from the blast spread across countries.
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