Radon is the number one cause of lung cancer among
non-smokers, according to EPA estimates. Overall, radon is the second
leading cause of lung cancer. Radon is responsible for about 21,000
lung cancer deaths every year. About 2,900 of these deaths occur among
people who have never smoked. On January 13, 2005, Dr. Richard H.
Carmona, the U.S. Surgeon General, issued a national health advisory on
radon.
The United Nation's World Health Organization (WHO) says that
radon is a worldwide health risk in homes. Dr. Maria Neira of WHO said
that "Most radon-induced lung cancers occur from low and medium dose
exposures in people's homes. Radon is the second most important cause of
lung cancer after smoking in many countries."
Radon is a radioactive gas released from the normal decay of uranium in
rocks and soil. It is an invisible, odorless, tasteless gas. Radon Gas
seeps up through the ground and spreads in every direction as it enters
the atmosphere. Radon can be dissolved in water and released into the
atmosphere when the water is used. Fortunately, Radon gas is minimal
outdoors. However, in areas without adequate ventilation, such as
crawlspaces and basements, radon can accumulate to levels that
substantially increase the risk of lung cancer.
Radon that enters your home eventually decays into radon decay elements.
It is these decay products that are of concern to us. While radon is a
gas, these radioactive elements are solid particles that become
suspended in air. As we inhale these extremely small particles, they
attach themselves to our lung tissue. Because these particles have very
short half lives, our lungs do not have the time to exhale them out
before they break down. It is the break down of these particles that
releases alpha, beta, and gamma radiation directly into our sensitive
lung tissue. Most hazardous of these is alpha radiation. It can kill a
lung tissue cell, and/or cause a mutation in the cell’s DNA causing that
cell to develop into a cancerous cell. This leads to an increased risk
of developing lung cancer over prolonged exposure.