Pig

A colloquial term describing a container (usually lead or depleted uranium) used to ship or store radioactive materials. The thick walls of this shielding device protect the person handling the container from radiation. Large containers used for spent fuel storage are commonly called casks.

A device used for cleaning a pipeline or separating two liquids being moved down the pipeline. It is inserted into the pipeline and carried along by the flow of oil or gas. An 'intelligent pig' is fitted with sensors which an check for corrosion or defects in the pipeline.