Japan's nuclear industry tries to clean up its image

More than 300,000 children from around the Fukushima nuclear plant in Japan are being given health check-ups because of fears about possible thyroid disorders from radiation.

The authorities say radiation levels outside the 20km evacuation zone are safe.

But the meltdown at Fukushima has added to public unease in Japan about nuclear energy and some experts say their warnings about the risks were ignored.

The BBC's science correspondent, David Shukman, reports.