Japan Earthquake: As It Happened

news.au.com - 5.36am Ron Chesser, director for the Centre for Environmental Radiation Studies at Texas Tech University, said it's critical to cool the reactor core to avoid a meltdown that would result in 'a large release of radiation.'

An 8.9-magnitude earthquake struck Japan on March 11, causing widespread destruction and triggering a tsunami. Times are in AEDT.

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5.36am Ron Chesser, director for the Centre for Environmental Radiation Studies at Texas Tech University, said it's critical to cool the reactor core to avoid a meltdown that would result in "a large release of radiation".

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