You don't have to cite DU's radioactivity, to be concerned about a health risk.
What happens to vaoprized DU? What is the size of the resulting particles? Does it aggregate anywhere in the environment? Does it concentrate in animals higher up the food chain?
In particles that small, yet that heavy, can it be held in suspension in water?
Does it tend to collect in fat tissue? Or does the liver confiscate it? Or?