This, she said, could well be outweighing the negative effects of radioactive exposure.

BBC: Nuclear birth fears eased

He also said the bunker was subject to regular inspection, never leaked radiation, and never posed any risk to the neighborhood of radioactive exposure.

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To put the reports coming out of Japan in perspective, the NRC limits occupational radiation exposure for adults working with radioactive material to 50, 000 microsieverts a year.

WSJ: Radiation's Effect Depends on Amount

By June, the levels of radioactive cesium-137 between 18 and 300 miles offshore were safe for human exposure, he said.

WSJ: In Japan, Relief at Radiation's Low Toll