Is there any amount of radioactive material too small to pose a health risk?

Nuclear Plant Logs 3rd Radiation Leak

Published: July 20, 2007

KASHIWAZAKI, Japan, July 19 — Troubles at a Japanese nuclear power plant damaged by an earthquake on Monday continued Thursday when the plant’s operator reported that it had detected a third radiation leak.

In a statement, Tokyo Electric Power, the operator, said that it had found tiny amounts of radioactive material in an exhaust filter at the plant, which was shut down Monday during a magnitude-6.8 earthquake near this city in northwestern Japan. The material was detected Wednesday, meaning it might have leaked a day or two after the earthquake, Tokyo Electric said.

The company said the amount of radioactive material was too small to pose a health risk. Still, the discovery is sure to add to criticism of Tokyo Electric, which has repeatedly apologized for delays and mistakes in reporting the extent of damage at the plant.

The company said the force of the earthquake set off a string of accidents, including a spill of slightly radioactive water and an earlier leak of radioactive material into an exhaust filter.

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