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DU rounds

These 30mm munitions (jackets and penetrators) are made with depleted uranium

First discovered in the 18th century, uranium is an element found everywhere on earth, but mainly in trace quantities. In 1938, German physicists Otto Hahn and Fritz Strassmann showed that uranium could be split or fissioned into parts to yield energy. Uranium is the principal fuel for nuclear reactors and the main raw material for nuclear weapons.

Natural uranium consists of three isotopes: uranium-238, uranium-235, and uranium-234. Uranium isotopes are radioactive. The nuclei of radioactive elements are unstable, meaning they are transformed into other elements, typically by emitting particles (and sometimes by absorbing particles). This process, known as radioactive decay, generally results in the emission of alpha or beta particles from the nucleus. It is often also accompanied by emission of gamma radiation, which is electromagnetic radiation, like X-rays. These three kinds of radiation have very different properties in some respects but are all ionizing radiation. Each is energetic enough to break chemical bonds, thereby possessing the ability to damage or destroy living cells.
Professor D-P - thanks for the lecture there matey! What are these fired at and from what? Never came across them myself.
 
basically it's a Anti Tank Round, GAU-8 Avenger A typical combat load for the GAU-8 would include 1,100 rounds of 30mm high explosive or armor piercing ammunition. The 30mm API is mixed with 30mm High Explosive Incendiary (HEI) at the factory and is called Combat Mix Ammunition. The ratio of API to HEI rounds in the Combat Mix is 4:1. Combat mix is a sequential mixture of DU and HEI rounds in which 1 HEI round followed by 4 DU rounds are fired by the AN/GAU-8 gatling gun. DU is the primary munition for the A/OA-10 in a combat environment. Depleted uranium results from the enriching of natural uranium for use in nuclear reactors. Natural uranium is a slightly radioactive metal that is present in most rocks and soils as well as in many rivers and sea water. Natural uranium consists primarily of a mixture of two isotopes (forms) of uranium, Uranium-235 (U235) and Uranium-238 (U238), in the proportion of about 0.7 and 99.3 percent, respectively. Nuclear reactors require U235 to produce energy, therefore, the natural uranium has to be enriched to obtain the isotope U235 by removing a large part of the U238. Uranium-238 becomes DU, which is 0.7 times as radioactive as natural uranium. . Since DU has a half-life of 4.5 billion years, there is very little decay of those DU materials. When manufactured as 30mm rounds, each DU projectile contains approximately 4,650 grains [0.66 pounds (lbs)] of extruded DU, alloyed with 0.75 weight percent titanium. The projectile is encased in a 0.8 mm-thick aluminum shell as the final DU round. During Operation DESERT STORM the Air Force fired 30mm Armor Piercing Incendiary (API) munitions using a depleted uranium [DU] penetrator slug from the GAU-8 Gatling gun mounted on the A-10 Aircraft. The 148 A-10s that deployed to Saudi Arabia flew 8,077 combat sorties. The Air Force fired a total of 783,514 rounds of 30mm API in the Gulf War. Since each round contains approximately 0.66 pounds of DU, the Air Force expended a total of 259 tons of DU in the Gulf. The armor-piercing capability of the DU projectiles fired from A/OA-10s proved exceptionally effective in countering threats from the Iraqi tanks so that a successful ground offensive could then be achieved. At times 30mm DU rounds misfire in the A-10s GAU-8 cannon. These "hangfires" have to be cleared and removed from the gun barrel, potentially exposing ground crews to airborne DU. Technical data available to maitenance crews does not provide an accurate means for determining the status of rounds in an unsafe/jammed gun, and revisions are in progress.
gau-8-fig14.jpg
 

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