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A radiation hotspot in Tokyo’s Setagaya Ward is not linked to the Fukushima nuclear crisis, Japanese authorities concluded Friday after finding dozens of old bottles of radium powder likely used for luminous paint.
As researchers carry out more stringent tests to map how far contamination has spread from the crippled Fukushima Daiichi nuclear power plant, local media had widely suspected the radiation hotspot was created by fallout from the plant.
But researchers inspecting the area and a nearby house discovered a decaying wooden box containing dozens of glass bottles under the floorboards, where the radiation levels hit more than 30 microsieverts per hour—an alarming level.