Could somebody knowledgeable help me out here? From what little I have read about uranium testing, I did not think it could be done directly to bones, but was done to igneous rock in the vicinity of the bones. And also I was under the impression that the slowness of the half life of most of the uranium cycle's isotopes made made precision to within tens of thousands of years unrealistic.
It depends on the geological profile of the site itself.
If the body is buried in an area where radioactive isotopes occurr naturally in groundwater, then the age of the bones, which have been absorbing these isotopes slowly over the years, can be dated.
That is how some items, such as carvings in ivory, have been dated in eastern Europe.