This stuff doesn't hang in the atmosphere for long, it falls to the ground fairly quickly. I used to have a bookmark for a site that had a very detailed report that did a decent job of documenting the rates and doses that one might encounter and how long it would take to get into ground water.
This isn't to deny heavy metal toxic exposure as one might get from lead or similar substances, but the idea that DU is an ionizing radiation hazard and causes a multitude of unrelated symptoms is far fetched.