It is a secondary mineral which contains magnesium, uranium and carbon.

For example, he assumed that the samples had contained only uranium and no lead when they were formed.

Ground water moves through rock containing uranium, which releases radon into the water.

Most of the thermonuclear stage, containing uranium, was left in situ.

"I never had the rocks tested for radioactivity, but my guess is they contain uranium."

His research focused on minerals containing uranium, vanadium, and various rare elements.

Each contains less uranium than would be needed for a bomb, and the fuel is dangerously radioactive, making it hard to handle.

It contains low-enriched uranium, control systems and structural materials.

There, the pits and other parts containing uranium are separated in bunkerlike assembly lines.