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Radon exposure (mostly radon daughters) has been linked to lung cancer in case-control studies performed in the US, Europe and China. There are approximately 21,000 deaths per year in the US (0.0063% of a population of 333 million) due to radon-induced lung cancers.
Radon map of the United States. ASTM E-2121 is a US standard for reducing airborne radon in homes as far as practicable below the action level of 4 picocuries per liter (pCi/L) (148 Bq/m 3). [4] [5] Some states recommend achieving 2.0 pCi/L or less.
Radon, a byproduct of naturally decaying uranium, is estimated to cause thousands of deaths each year nationwide. Here's how to protect yourself.
Maps of average radon levels in houses are available, to assist in planning mitigation measures. [8] While high uranium in the soil/rock under a house does not always lead to a high radon level in air, a positive correlation between the uranium content of the soil and the radon level in air can be seen.
Radon concentration in the atmosphere is usually measured in becquerels per cubic meter (Bq/m 3), which is an SI derived unit. As a frame of reference, typical domestic exposures are about 100 Bq/m 3 indoors and 10–20 Bq/m 3 outdoors. In the US, radon concentrations are often measured in picocuries per liter (pCi/L), with 1 pCi/L = 37 Bq/m 3. [5]
Together, the Blue Ridge province and the New England province are often referred to as the Crystalline Appalachians. Rocks of the Reading Prong are characterized by elevated concentrations of uranium, the decay of which produces gaseous radon, a potentially hazardous source of indoor contamination in structures constructed on the prong. [4]
Radon is unevenly distributed and varies with weather, such that much higher doses apply to many areas of the world, where it represents a significant health hazard. Concentrations over 500 times the world average have been found inside buildings in Scandinavia, the United States, Iran, and the Czech Republic. [8]
This is a dynamic list of hot springs in the United States. The Western states in particular are known for their thermal springs: Alaska, Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming; but there are interesting hot springs in other states throughout the country.