Just a few more points to help flesh out this set of
DU writeups:
Depleted Uranium has a density which is about twice that of lead.
As stated previously, DU is slightly radioactive, emitting low levels of alpha particles. Since these don't travel very far in air, the greatest health risk is caused by inhalation or ingestion of DU particles created when DU armour is hit or when a DU-tipped artillery shell explodes.
To put the radiation level of this material in perspective: The radiation level is around 30 million times less than that of the americium used in household smoke detectors. Of course, we are not likely to ingest americium particles from our smoke detectors, so they don't pose a significant health hazard.
The predominant influence on the health of people exposed to DU dust is caused by its chemical toxicity. The amount of DU particles ingested which can lead to heavy metal toxicity problems is thousands of times less than that required to cause radiological problems.
Use of Depleted Uranium on the battlefield is suspected of being the cause of Gulf War Syndrome.