Instead, the conventional explosive would simply spread radioactive material over a target area.

Wash hands with soap and water to prevent spreading potentially infectious material to face or skin.

A dirty bomb is an explosive designed to spread dangerous radioactive material over a wide area.

It is designed to spread radioactive material to a large area.

If he fired on it, the whole thing could go up, spreading radioactive material.

Dirty bomb: a device designed to spread radioactive material by conventional explosives when the bomb explodes.

A specialized tool used to spread material over the surface of a culture medium is called "Kruse's brush".

So the perfect moment for a precision attack would be right now, before blowing the building to bits could spread nuclear material across the countryside.

Perhaps more likely than an atomic detonation would be a "dirty bomb," in which conventional explosives spread radioactive material.

An explosion would spread radioactive material into the environment, experts say.