Description:
Radon is a colorless, odorless, radioactive gas
produced by the decay of uranium, which is
present in virtually all rocks and soils, typically
at concentrations of 1
to 4 parts per million (ppm).
Radon can accumulate inside homes and other
buildings at concentrations that are commonly tens
of times greater than in outdoor air and, in some
cases, may be hundreds or even thousands of times
greater. Most indoor radon is derived from uranium in underlying soil and rock and gradually
seeps into buildings through cracks or other openings in the ground floor. Houses with unusually
high concentrations of indoor radon are typically
built on rock and soil that contain unusually high
uranium concentrations.