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What is radon? Radon is a colorless, odorless, tasteless, invisible and chemically inert gas that comes from the decay of radium in the soil. Radium is a decay product of uranium. Uranium is present in almost all rocks and soil and material derived from rocks.Where does radon come from? Radon is constantly being generated by the radium in rocks, soil, water and materials derived from rocks and soils. The radon generated in rocks or water usually stays trapped in that material unless the rocks are fractured or the water is mixed with the air. Radon-222 is the decay product of radium-226. Radon-222 and its parent, radium-226, are part of the long decay chain for uranium-238. Since uranium is essentially everywhere in the earth's crust, radium-226 and radon-222 are present in almost all rock and all soil types. The amount of radon soil can produce depends on local geology and can vary from house to house. Radon levels in the soil range from a few hundred to several thousand pCi/L (picoCuries per Liter). The amount of radon that escapes from the soil to enter the house depends on the suction created within the house, soil porosity, soil moisture, and the weather.What is the average level of Radon found in homes in the U.S.? Based on a national residential radon survey completed in 1991, the average indoor radon level in the United States is about 1.3 picoCuries per liter (pCi/L). The average outdoor level is about 0.4 pCi/L. What is the extent of radon problems in Florida? The department collects radon test reports from state certified radon testing companies. About 1 in 5 radon tests made in Florida are found to be elevated. Locally the number of homes reporting elevated radon varies from a high of 7 out of 10 to a low of 1 out of 100. Elevated radon levels have been reported from all regions of the state. Ultimately the only way to tell if your home has a radon problem is to test for it. What does pCi/L mean? PicoCuries per liter (pCi/L) is a unit for measuring radioactive concentrations. The curie (Ci) unit is the activity of 1 gram of pure radium-226. Pico is a scientific notation denoting a factor of 10-12.
EarthExplorer (EE) provides online search, browse display, metadata export, and data download for earth science data from the archives of the U.S. Geological Survey (USGS). EE provides an enhanced user interface using state-of-the-art technologies for searching, viewing, and downloading data. Note: August 21, 2019 transitioned from Google Map Interface to Leaflet Map Interface. 2b1af7f3a8