Releases of radioactive water into the ocean near Japan's stricken nuclear complex shouldn't pose a widespread danger to sea animals or people who might eat them, experts say.
That's basically because of dilution.
"It's a very large ocean," noted William Burnett of Florida State University.
Very close to the nuclear plant — less than half a mile or so — sea creatures might be in danger of problems like genetic mutations if the dumping goes on a long time, he said. But there shouldn't be any serious hazard farther away "unless this escalates into something much, much larger than it has so far," he said.
Ken Buesseler of the Woods Hole Oceanographic Institution in Massachusetts said readings for radioactive iodine and cesium show a thousandfold drop from the shore to monitors about 19 miles offshore.
He said radioactive doses in seafood may turn out to be detectable but probably won't be a significant health hazard. They'd probably be less of a concern than what people could get from land-based sources such as drinking water or eating produce, he said.
No fishing is allowed in the vicinity of the complex.
Radioactive water has been seeping into the Pacific Ocean from the nuclear plant, and on Monday plant operators began releasing more than 3 million gallons of tainted water to make room at a storage site for water that's even more radioactive.
Igor Linkov, an adjunct professor of engineering and public policy at Carnegie Mellon University, also said he did not expect any major impact on ocean wildlife or people who eat seafood.
He agreed that animals near the plant may be affected. It's not clear in what way, because the level of radiation isn't well known, he said. In any case, fish would probably escape such an effect because unlike immobile species such as oysters, they move around and so would not get a continuous exposure, he said.