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Exposure may top 100mSv for JAEA worker

Jiji Press TOKYO (Jiji Press) — Internal radiation exposure would likely reach 100-200 millisieverts for one of the five workers affected by an accident at a facility of the Japan Atomic Energy Agency last month if the exposure continues for 50 years, a national research institute has said.

“Radiation exposure of 100 millisieverts means the risk that the number of people who develop cancer would increase by five per 1,000,” Makoto Akashi, an official of the National Institutes for Quantum and Radiological Science and Technology (QST), told a press conference on Monday.

Internal exposure could be reduced with medication to discharge radioactive materials from the body, Akashi said.

Soon after the June 6 accident at the JAEA’s Oarai Research & Development Center in Ibaraki Prefecture, eastern Japan, the agency said that 22,000 becquerels of plutonium was found in the worker’s lungs and that his 50-year internal exposure is estimated to total as high as 12 sieverts.

But it was found later that decontamination of the male worker at the time of the calculation was insufficient and that the estimated figure included his external radiation.Speech

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