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Fukushima leak: 'Wrong equipment' used to measure radiation

1 September 2013 Last updated at 12:30 BST

Radiation levels around a leaking tank at the Fukushima nuclear plant in Japan are 18 times higher than originally thought, according to officials.

New readings showed radiation levels high enough to give a lethal dose in as little as four hours.

The BBC's Rupert Wingfield-Hayes said new radiation monitoring equipment has revealed the true extent of the problem.