The Ministry of Economy, Trade and Industry said Monday that radioactive crushed stone may have been used in the construction of up to 80 buildings in Fukushima Prefecture.
The announcement comes after radioactive cesium was detected last week in a 3-story reinforced concrete condominium built in Nihonmatsu City, Fukushima, last July. Officials say the cesium was detected in concrete made of stones that were left outside at a facility in Namie town within the 20-kilometer evacuation zone around the Fukushima Daiichi nuclear power plant.
The level of radioactive cesium was 1.24 microsieverts per hour in the wall of the first-floor apartment. The radiation level was lower on the 2nd and 3rd floors.
The ministry said another building using materials from the same quarry agent association was found to be giving off 0.3 - 0.4 microsieverts an hour.
On Sunday, an association of quarry agents in Fukushima Prefecture asked its members to check the radiation levels of their crushed stone and other building materials to ease public concerns over radioactive contamination, Fuji TV reported.
The company that operates the crushed stone facility said that after the March 11 disaster, it shipped crushed stones to 20 construction firms in Fukushima Prefecture last April and May.
METI said it is possible that the same rock was used in the construction of over 80 other buildings in Fukushima and Nihonmatsu.© Japan Today