These springs are the most radioactive in Europe.

Curium is one of the most radioactive isolable elements.

That made the Irish Sea the most radioactive stretch of water in the world.

Kyrgyzstan's Environment Ministry said three of the most radioactive sites are on particularly unstable ground.

Thorium and uranium are the two most common radioactive elements on earth; they have been around since the earth was formed.

The Irish Sea is reputed to be the most radioactive in the world.

Depleted of its most radioactive part for use in nuclear fuel, the material still emits low-level radiation.

Radium was the most radioactive substance the Curies had encountered.

The waste is shipped through the Irish Sea, thus making it the most radioactive body of water in the world.

The Red Forest was among the world's most radioactive places.