Japanese authorities are unsure about the medical prognosis for five staffers who inhaled toxic plutonium after mishandling it at the Oarai Research and Development Center outside Tokyo.
“As far as I can remember, no one has inhaled plutonium at this level, ” said Ishikawa Keiji, a security official at the Japan Atomic Energy Agency (JAEA) which oversees the lab, cited by the Jiji Press news agency.
The accident occurred at 11: 15am on Tuesday in the analysis room of the facility dedicated to researching improved nuclear fuel for its fast reactors.
One of the five men opened a metallic cylinder where the fuel, a mixture of uranium and plutonium, is stored before and after experiments. In the process, the double plastic wrapping inside which the radioactive material is kept ripped, and the toxic substance burst into the air.
Shunichi Tanaka, chairman of the Nuclear Regulation Authority (NRA) , which has frequently criticized the JAEA for the conditions at its facilities, said “workplace complacency” was possibly to blame.
The NRA said the workers had never experienced a similar plastic rip before, and as a result, did not feel the need to complete their research in a tightly sealed environment.
