Plants absorb some uranium from soil. Dry weight concentrations of uranium in plants range from 5 to 60 parts per billion, and ash from burnt wood can have concentrations up to 4 parts per million. High-grade ores found in Athabasca Basin deposits in Saskatchewan, Canada can contain up to 70% uranium oxides, and therefore must be diluted with rock prior to milling, in order to reduce radiation exposure to workers. Uranium ore's crushed and rendered into a fine powder and then leached with eith… (More on Uranium)