It will use hi-tech equipment to carry out thermal imaging surveys to see where heat is being lost.

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Firefighters used hand-held thermal imaging cameras to find a softball-sized heat signature, according to Chief Donahue.

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Indeed, ultrasound is being used not only for imaging, but also as a source of heat itself.

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The heat from decay is lessening day by day, and the latest thermal imaging reports indicate temperatures of less than 100 degrees centigrade in reactor units 1, 2 and 3.

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