Japanese Buddhist monk Tanaka Tokuun, who was evacuated from Fukushima prefecture, looks over an instrument measuring radiation levels at a hotel on March 17. Buddhika Weerasinghe/Getty Images hide caption

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A Tokyo Electric Power Co. worker looks at gauges in the control room for Units 1 and 2 at the Fukushima Dai-ichi plant, Wednesday. AP Photo/Nuclear and Industrial Safety Agency hide caption

itoggle caption AP Photo/Nuclear and Industrial Safety Agency

A boy evacuated from Koriyama, some 37 miles from the Fukushima Dai-ichi plant, gets scanned with a Geiger counter Wednesday. Ken Shimizu/AFP/Getty Images hide caption

itoggle caption Ken Shimizu/AFP/Getty Images

The Fukushima Power Plant in Japan had three safety measures in place to make sure the fuel rods inside the nuclear reactor do not overheat. For various reasons attributed to the earthquake that triggered a tsunami, the measures failed. bagalute/flickr hide caption

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A man is scanned for radiation exposure at a temporary center for residents living close to the damaged Fukushima Daiichi plant on Wednesday, March 16, 2011. Gregory Bull/AP hide caption

itoggle caption Gregory Bull/AP