The section addresses the issue of the radiation effects of uranium. Unlike the situation with the chemical effects, the amount of radiation to which the body is exposed is different for the various forms of uranium. Natural uranium is only mildly radioactive, and depleted uranium is 40% less radioactive. However, disease due to radiation effects of uranium, whether natural or depleted, has not been observed in either animals or humans. Therefore, this section focuses more on radiation exposure than actual disease. Although the radiation dose from a particular uranium exposure can be estimated, it is small. Because disease from the radiation has not been observed, the radiation effect is usually less of a concern than the chemical effect: natural and depleted uranium are much more likely to be chemical than radiation hazards.