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When people are exposed to uranium radionuclides that are formed during radioactive decay for a long period of time, they may develop cancer.The chances of getting cancer are much higher when people are exposed to enriched uranium, because that is a more radioactive form of uranium.Uranium in air exists as dust that will fall into surface water, on plants or on soils through settling or rainfall.It will than sink to the sediment in water or to the lower soil layers, where it will mix with uranium that is already present.Scientists have detected no harmful radiation effects of natural levels of uranium.However, chemical effects may occur after the uptake of large amounts of uranium and these can cause health effects such as kidney disease.

Erosion of tailing from mines and mills may cause larger amounts of uranium to be released into the environment.Uranium glazes are banned, but some artists that still use them for glasswork will experience a higher-than-usual exposure.Because uranium is a radioactive substance health effects have been researched.The concentrations of uranium in seafood are usually so low that they can be safely ignored.People that live near hazardous waste sites, people that live near mines, people that work in the phosphate industry, people that eat crops grown on contaminated soil or people that drink water from a uranium waste disposal point may experience a higher exposure than other people.Humans add uranium metals and compounds, because they are released during mining and milling processes. Even at higher than usual concentrations in air, there is so little uranium present per cubic meter that less than one atom transfers every day.