Depleted uranium (DU) is what is left after raw uranium has been enriched to the highly radioactive isotope U-235 used for weapons and power generation. For every ton of U-235 produced, there are seven tons of DU. Estimates vary, but it seems that currently the US alone has in excess of five million tons of stockpiles of DU. This has no commercial use beyond its use as a radiation shield in medical devices, and for adding to concrete to form radiation containing bunkers. However, this requires an insignificant quantity of the DU produced each year.
The half-life of DU is 4.5 billion years, so storing it safely and indefinitely is cost prohibitive. To remedy the situation, the US Department of Energy has made it freely available to the Pentagon and US armaments and armour manufacturers, and it has been used in weapons exported to 29 countries. It is simply cheaper to make it into weapons than store it.According to the declassified Groves memo from the Manhattan Project in 1943, the properties of DU in weapons has been known and strategised with for 60 years. It is clear that the US has known for 60 years about the effects of DU on the battlefield, also the danger to its own soldiers.
~ Alok O'Brien