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2011.3.11 the Great East Japan Earthquake struck the Tohoku region Pacific Ocean coast of Japan.This earthquake caused a huge tsunami, it gave extensive damage and many deaths.In the Fukushima Daiichi nuclear power plant, the tsunami destroyed the power generation equipment and caused a total loss of power, as a result,reactor lost its cooling function, and then it has led to hydrogen explosions.For this explosion, a wide range of areas has been contaminated by radioactive materials.