In this Tuesday, March 5, 2013, a worker shovels the top layer of radiation-contaminated soil at a house in Naraha, just outside the exclusion zone surrounding the Fukushima Dai-ichi nuclear plant in Japan. Decontamination efforts have begun in the town but resident have not been allowed to return for more than brief visits. Two years after the triple calamities of earthquake, tsunami and nuclear disaster ravaged Japan's northeastern Pacific coast, radioactive and chemical contamination remains a threat. (AP Photo/Greg Baker)

Associated Press
In this Tuesday, March 5, 2013, a worker shovels the top layer of radiation-contaminated soil at a house in Naraha, just outside the exclusion zone surrounding the Fukushima Dai-ichi nuclear plant in Japan. Decontamination efforts have begun in the town but resident have not been allowed to return for more than brief visits. Two years after the triple calamities of earthquake, tsunami and nuclear disaster ravaged Japan's northeastern Pacific coast, radioactive and chemical contamination remains a threat. (AP Photo/Greg Baker)
In this Tuesday, March 5, 2013, a worker shovels the top layer of radiation-contaminated soil at a house in Naraha, just outside the exclusion zone surrounding the Fukushima Dai-ichi nuclear plant in Japan. Decontamination efforts have begun in the town but resident have not been allowed to return for more than brief visits. Two years after the triple calamities of earthquake, tsunami and nuclear disaster ravaged Japan's northeastern Pacific coast, radioactive and chemical contamination remains a threat. (AP Photo/Greg Baker)
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