The man was detained at Boryspil airport, Ukraine’s main international gateway, with 582 grams of uranium. “SBU officers detained the person who was moving a case with a radioactive substance ãranium-238 — in his car,” the government said in a statement. It said ministry specialists had seized the case. A ministry official said an investigation had been launched. Depleted uranium, where uranium-238 is normally found, can theoretically be used to make nuclear “dirty bombs”, but it is often used in gun ammunition and armour because of its high density.