Japan earthquake: Nuclear physicist on radiation risk
Radiation from Japan's quake-stricken Fukushima Daiichi nuclear plant has reached harmful levels, the government says.
The warning comes after the plant was rocked by a third blast which appears to have damaged one of the reactors' containment vessels for the first time.
Nuclear physicist, Professor Paddy Regan, described the potential health risks stemming from problems at the plant.
15 Mar 2011