The operator of the Fukushima Daiichi nuclear plant says high levels of radioactive cesium in groundwater may be due to soil mixed into the water.Tokyo Electric Power Company announced on Tuesday that the level of radioactive cesium in a newly-dug well between the No. 2 reactor and the ocean increased 100 times over the previous 5 days.The reading was taken close to a site where highly radioactive water from the reactor leaked into the ocean after the nuclear accident in 2011.In a news conference on Wednesday, officials said that after they filtered the water sample and measured it again, the cesium reading dropped to levels recorded 5 days earlier.They said contaminated soil could be to blame for the higher readings in the groundwater, and that the soil was likely mixed with the water when workers pumped up a sample for testing.But the operator said it has not ruled out other causes, and will continue investigating.Japan's Nuclear Regulation Authority says it will check other wells near the No. 3 and 4 reactors, as water in those wells is contaminated with cesium as well.
Jul. 10, 2013 - Updated 19:04