Radioactive waste can be solid, liquid, or gaseous waste that contains radionuclides.
The United States has in excess of 1.1 billion pounds of DU waste material. To enrich uranium, a process called gaseous diffusion was developed by the United States in the 1940s. The Department of Energy plans to recycle massive quantities of 1,250,000,000 pounds of DU into the commercial marketplace for reuse in consumer goods. Read An International Appeal to Ban the Use of Depleted Uranium Weapons drafted by Ramsey Clark. HLW includes spent nuclear fuel, liquid waste, and solid waste derived from the liquid.