Radon discovery examinations are designed to discover radon gas in picocuries per liter of air (pCi/L). The picocurie is made use of to determine the magnitude of radiation in regards to fragmentations per min. One pCi, one trillionth of a Curie, equates to 2.2 disintegrations per min. The most usual geologic source of radon stems from the decay of uranium. Radon is generally found at low levels in widely distributed crustal formations, dirt, and water samples.