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.