Radon gas is one of the indoor pollutants that may be presence in your house. This gas is radioactive in nature and is one of the major causes of lung cancer in the USA. The Environmental Protection Agency of the United States estimates that there are 21,000 deaths each year due to lung cancer caused by this gas. There are over 36 isotopes of this gas but the most stable isotope is 222 Rn.

These isotopes have different atomic mass due to the different number of neutrons. The half life for each isotope is also different.

The atomic number of 222 Rn is 86. We will focus our discussion on this gas as it is the most common pollutant with a half-life of 3.8 days.

Properties of Radon-222

Rn-222 is a by product of the decay chain of Uranium-238 that could be contained in the rock or soil where your house or building is built.  Uranium-238 decays to Radium-226 which furthers decay to Rn-222. Here are some of the properties of this harmful gas.

  • Odorless
  • Radioactive
  • Colorless
  • Tasteless
  • Gas form at standard temperature & pressure. The freezing temperature is -96 °F (-71 °C)
  • Soluble in water
  • Half-life of 3.82 days
  • Very dense gas at 9.73 kg/cubic meter

How does Rn enter the building?

As this gas is emitted in the soil and rocks beneath the earth which contains the uranium, it will enter the building or houses through cracks in the floors and walls. The gaps and crevices around the pipes are other ways that this gas enters. Drinking water contaminated with this radioactive gas is another way we may be affected.

EPA also reported that 1 in 15 homes in the United States has a higher than normal concentration of Radon. The level of Rn should be less than 4 picocuries per liter. As the occurrences of this gas is high, you can get a test kit and do it yourself or get a certified personnel to test the presence of this gas. If it is higher than the acceptable level, steps need to be taken to seal all openings or cracks beneath your house. At the same time,  a system can be installed to exhaust this gas from your house if necessary.

Test Kit and Remedy

Radon Test Kit – Photo by National Cancer Institute

You can purchase the test kit to test the level of this gas and follow the instruction that comes with the kit. You will need to send the kit that has been exposed to the air in your house to a lab for analysis. The other way is to get a certified radon professional within your vicinity to help you with the test.

If the level detected is high, some of the remedies include:

  • Seal the cracks on the walls, foundation of the house, crevices and gaps to prevent the gas from entering the house.
  • Install vent pipe that will pull the gas from under the house and discharge it to the outside of the house.
  • Tests need to be done again to confirm that the level of this gas has been drastically reduced to acceptable level.
  • Make sure you retest your house at an interval of every 2 years to ensure the level is still within the recommended level. This need to be done especially if your house has a history of high concentration level of this gas.

Getting your house fix from Rn pollution is not costly. An estimate costs of US500 or below will do the job.

Editorial Contributors
Alora Bopray

Alora Bopray

Staff Writer

Alora Bopray is a digital content producer for the home warranty, HVAC, and plumbing categories at Today's Homeowner. She earned her bachelor's degree in psychology from the University of St. Scholastica and her master's degree from the University of Denver. Before becoming a writer for Today's Homeowner, Alora wrote as a freelance writer for dozens of home improvement clients and informed homeowners about the solar industry as a writer for EcoWatch. When she's not writing, Alora can be found planning her next DIY home improvement project or plotting her next novel.

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Roxanne Downer


Roxanne Downer is a commerce editor at Today’s Homeowner, where she tackles everything from foundation repair to solar panel installation. She brings more than 15 years of writing and editing experience to bear in her meticulous approach to ensuring accurate, up-to-date, and engaging content. She’s previously edited for outlets including MSN, Architectural Digest, and Better Homes & Gardens. An alumna of the University of Pennsylvania, Roxanne is now an Oklahoma homeowner, DIY enthusiast, and the proud parent of a playful pug.

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