TEPCO: Fukushima nuclear Unit 1 did melt down in 2011 accident

The Tokyo Electric Power Corp. says Unit 1 at the Fukushima Daiichi nuclear power plant did, in fact, meltdown during the 2011 accident.

TEPCO released results from a three-day study in February of the Unit 1 reactor building jointly with the International Research Institute for Nuclear Decommissioning. The two companies collected data until March 10. The project used cosmic rays to inspect the interior of the building. By analyzing the flow of muons, which are subatomic particles generated when cosmic rays collide with the atmosphere, TEPCO was able to generate X-ray like images of the interior of the reactor. Muons can pass through concrete and iron, but they are blocked and change direction when they hit high-density substances such as plutonium and uranium, creating a “shadow.”
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