Top priority at the damaged Fukushima Daiichi nuclear power plant is to locate the source of radiation now pouring into the environment.
The Tokyo Electric Power Company (TEPCO), which operates the plant, says that contamination spilling into the sea almost certainly originates from reactor 2, and that work to plug it could take months. But there may be other sources, according to reports today from Japan. In this briefing New Scientist assesses the latest information.
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