from depleted uranium in urine of soldiers by the wise uranium project is du more hazardous than natural uranium since it contains contaminants such as uranium plutonium etc no depleted uranium used for bullets has been found to contain trace amounts of artificial radionuclides such as uranium neptunium and plutonium the presence of these radionuclides can be explained by contamination from recycling of spent fuel introduced in the manufacturing process for details see diehl the radiation dose from exposure to such contaminated du is only a fraction of a percent higher than from pure du and thus still is lower than from natural uranium for details see diehl