5 workers exposed to radiation at Japan nuclear lab
TOKYO (AP) — Five workers at a Japanese nuclear facility that handles plutonium have been exposed to high levels of radiation after a bag containing highly radioactive material apparently broke during an equipment inspection, the Japan Atomic Energy Agency said Wednesday.
The incident occurred Tuesday at its Oarai Research & Development Center, a facility for nuclear fuel study that uses highly toxic plutonium. The cause of the accident is under investigation, the state-run agency said. It raised nuclear security concerns as well as questions about whether the workers were adequately protected.
The agency said its initial survey found contamination inside the nostrils of three of the five men, a sign they had inhaled radioactive dust. All five were also found to be contaminated on their limbs after removing protective gear and taking a shower, which would have washed off most contamination.
Agency spokesman Masataka Tanimoto said one of the men had high levels of plutonium exposure in his lungs. The worker, in his 50s, had opened the lid of the container when some of the 300 grams (10 ounces) of plutonium and uranium in the broken bag flew out.
Internal exposure poses a bigger concern because of potential cancer-causing risks. The man’s exposure, 22,000 Becquerels, could mean the effect on his lungs may not be immediately life-threatening but would add up over time, and he will need to be regularly monitored, said Makoto Akashi, a doctor at the National Institute of Radiological Sciences, where the workers are being treated.