Radon is a naturally occurring radioactive gas that comes from the decay of uranium found in soil, rock, and sometimes water. Specifically, uranium breaks down into radium, which then decays to produce radon gas
. This uranium is present in nearly all soils and rocks, including granite, shale, and other common geological materials
. Radon gas moves up through the soil and can enter buildings through cracks and openings in foundations, accumulating to potentially harmful levels indoors
. It is invisible, tasteless, and odorless, making it undetectable without testing
. Radon can also be found in groundwater, such as spring waters and hot springs, where it can accumulate due to the decay of radium in rocks
. In summary, radon originates primarily from the natural radioactive decay of uranium in the earth's crust and can enter homes and buildings from the soil and sometimes water sources
