Radon is a naturally occurring radioactive gas, which has always been a part of our environment. It's a natural decay product of uranium and is found in soil everywhere in varying concentrations. The New Jersey Department of Environmental Protection (DEP) and the United States Environmental Protection Agency (EPA) has found that radon can also be an unwelcome part of our home environment.
How can I tell if there is significant Radon gas in the house?
Radon gas can accumulate in enclosed places, such as a house, but its presence, even in high concentrations, cannot be detected by human senses because the gas is invisible and has no odor. Long term or chronic exposure to radon has been linked to lung cancer. The greater the concentration and the longer a person is exposed, the greater the risk, so all people are encouraged to reduce their exposure. However, because of its physical characteristics, the only way to detect the presence of radon gas and measure the level is by a test. So people wanting to limit their exposure must first conduct a test to determine what their exposure levels are.
In New Jersey, there is a particularly uranium-rich geological formation, called the Reading Prong, which stretches from Pennsylvania through northwestern New Jersey into Southern New York State. Testing of homes built along this geologic formation has revealed high indoor levels of radon gas. Further testing in New Jersey, beyond the Reading Prong area, has shown additional areas where homes have elevated radon levels. This has led the DEP to conclude that radon is a statewide health issue. All homeowners are encouraged to test and, if levels are elevated, residents are urged to consider remediation.
Radon can move easily through soil and tiny cracks in rock. When it reaches the surface of the soil, it disperses and is diluted to very low levels in the outdoor environment. However, when the gas moves upward through soil beneath a home, it may enter through cracks or other openings in the foundation and build up to unacceptable levels.
How does Radon gas enter the house?
Slight differences between indoor and outdoor pressure can affect the rate at which radon enters the home. Reduced indoor pressure draws the gas through any cracks and openings. This lower indoor pressure may be caused by open windows on the downwind side of the house, operation of kitchen or exhaust fans, and the use of air by furnaces and other large appliances. The fact that air in a house is often warmer than the surrounding air and tends to rise can also cause reduced indoor pressure. Another means of entrance for the gas is water supplies, particularly underground wells. However, the levels in water supplies in New Jersey are usually not high enough to present a significant risk by themselves. Also, public water supplies usually undergo a great amount of agitation and aeration during treatment, which releases the radon gas before it reaches any residence.
