Nuclear accidents likely 'every ten to twenty years'

Catastrophic nuclear accidents such as the core meltdowns at Chernobyl and Fukushima are 200 times more likely to happen than previously believed, say scientists.

Radioactivity in Japanese waters thousands of times higher than normal

With recent reports that there have been further radioactive leaks from the Fukushima nuclear power plants, a new study has assessed the level of radioactivity in the ocean in the first months after the disaster.

Radioactive sulfur in California 'not a problem' say scientists

Tiny amounts of radioactive sulfur reached California after the Fukushima nuclear disaster - but it's nothing to worry about, say scientists.