Effect of Nuclear Bomb Explosion

40 years ago today, on April 26, 1986, the Chernobyl disaster began during a late night safety test at Reactor No. 4. A combination of design flaws in the RBMK reactor and human mistakes caused a sudden power surge. At 1:23 a.m., explosions blew the reactor apart, exposing its core and releasing massive amounts of radioactive material into the atmosphere. Firefighters and plant workers were the first to respond, not fully aware of the radiation danger. Many walked directly on radioactive debris

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Animated map shows every nuclear-bomb explosion in history

Inside Chornobyl, 40 years after the world's worst nuclear disaster