The operator of a nuclear research facility north of Tokyo has detected contaminants scattered in the same room in which workers were exposed to radioactive substances from a nuclear fuel container.
Five workers were inspecting the container at the facility in Ibaraki Prefecture on Tuesday. A bag inside the canister suddenly burst, expelling radioactive powder.
The operator, Japan Atomic Energy Agency, says it has detected radioactive substances from 14 sections of the room’s floor. It says measurements reached a maximum of 55 becquerels per square centimeter.
Photos taken a day after the accident show black flecks scattered on the floor. The agency says they could be plutonium and uranium.
After the accident, the 5 workers were kept in the contaminated room for 3 hours. Agency officials said they did not anticipate an incident of this kind, and needed time to set up a tent outside the room to decontaminate the workers.
The agency earlier said one of the workers had 22,000 becquerels of radioactive substances in his lungs. This level of exposure can cause major damage to health. But it now says the actual figure could be lower. Officials say the testing device may have also measured contaminants on the surface of the man’s body.
The worker has been transferred to the National Institute of Radiological Sciences. The officials say plutonium was not detected in an initial test there.