WASHINGTON - The Pentagon on Wednesday posted a website mapping the amount of radiation to which the tens of thousands of Americans in Japan at the time of last year's earthquake and nuclear disaster were exposed and said none of the doses posed health risks.

The 9.0 magnitude March 11, 2011 earthquake and tsunami devastated the Fukushima Daiichi nuclear plant north of Tokyo, triggering meltdowns, spewing radiation and prompting the Pentagon to announce voluntary evacuation for families of service members stationed in Japan.

The temblor generated a tsunami wave of up to 10 meters (33 feet) that swamped the Fukushima plant and the surrounding Tohoku region of central Honshu.

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