I suspect that they will find much if not all of the elevated dose is from natural radioactive elements.
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New condo's foundation radioactive
Quarry sourced crushed stones from hot-zone city of Namie
FUKUSHIMA — High levels of radiation have been detected on the first floor of a newly built condominium complex in Nihonmatsu, Fukushima Prefecture, the municipal government said.
Crushed stones used in the building's concrete foundation came from the exclusion zone around the Fukushima No. 1 nuclear plant, local government officials said.
A quarry firm said Monday it shipped some 5,280 tons of crushed stones from Namie, Fukushima Prefecture, to 19 contractors after the nuclear crisis started last March 11, including some 1,065 tons distributed to a concrete maker that provided the material for the Nihonmatsu building's foundations.
The firm is investigating its shipments to determine if crushed stones contaminated with radiation also were used in other buildings.
The city of Nihonmatsu detected 0.9 to 1.24 microsieverts of radiation per hour inside the first-floor condominium unit, which is higher than the radiation level outside, which was between 0.7 to 1 microsieverts at places 1 meter above ground around the building. On the second and third floors, the inside readings were 0.1 and 0.3 microsievert.
The city conducted the checks after a junior high school girl living on its first floor logged an exposure reading of 1.62 millisieverts during a three-month period from September, the local authority said.
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