seen as a result of exposure to natural or depleted uranium, exposure to uranium and its decay products, especially radon, are widely known and significant health threats. Exposure to strontium-90, iodine-131, and other fission products is unrelated to uranium exposure, but may result from medical procedures or exposure to spent reactor fuel or fallout from nuclear weapons. Although accidental inhalation exposure to a high concentration of uranium hexafluoride has resulted in human fatalities, those deaths were associated with the generation of highly toxic hydrofluoric acid and uranyl fluoride rather than with uranium itself. Finely divided uranium metal presents a fire hazard because uranium is pyrophoric; small grains will ignite spontaneously in air at room temperature. Uranium metal is commonly handled with gloves as a sufficient precaution. Uranium concentrate is handled and contained so as to ensure that people do not inhale or ingest it. See also K-65 residues List of countries by uranium production List of countries by uranium reserves List of uranium projects Lists of nuclear disasters and radioactive incidents Nuclear and radiation accidents and incidents Nuclear engineering Nuclear fuel cycle Nuclear physics Quintuple bond (earlier thought to be a Phi bond), in the molecule U2 Thorium fuel cycle World Uranium Hearing Notes References External links Nuclear fuel data and analysis from the U.S. Energy Information Administration Current market price of uranium World Uranium deposit maps Annotated bibliography for uranium from the Alsos Digital Library NLM Hazardous Substances Databank—Uranium, Radioactive CDC – NIOSH Pocket Guide to Chemical Hazards Mining Uranium at Namibia's Langer Heinrich Mine World Nuclear News ATSDR Case Studies in Environmental Medicine: Uranium Toxicity U.S. Department of Health and Human Services Uranium at The Periodic Table of Videos (University of Nottingham) Chemical elements Actinides Nuclear fuels Nuclear materials Suspected male-mediated teratogens Manhattan Project