Fukushima caesium leaks 'equal 168 Hiroshimas'

The blinding blast of the Hiroshima bomb and its fallout killed some 140,000 people, either instantly or in the days and weeks that followed as high radiation or horrific burns took their toll.

At Fukushima, Japan declared a 20-kilometre  evacuation and no-go zone around the plant after the March 11 quake and tsunami triggered the world's worst nuclear accident since Chernobyl 25 years ago.

A recent government survey showed that some areas within the 20-kilometre zone are contaminated with radiation equivalent to more than 500 millisieverts per year - 25 times more than the government's annual limit.

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