Radon doesn't appear out of nowhere. It is the product of a natural, ongoing process deep within the earth. Understanding how radon forms helps explain why it's so widespread and why no home is completely immune.
The Radioactive Decay Chain
Radon forms as part of the uranium decay chain. Uranium-238, which is found naturally in soil, rock, and water all over the world, slowly breaks down over billions of years. As it decays, it passes through several intermediate elements before eventually producing radium-226. When radium-226 decays, it releases radon-222 — the form of radon most relevant to indoor air quality.
Why Radon Is a Gas
Unlike uranium and radium, which are solid metals that stay fixed in rock and soil, radon is a noble gas. This means it doesn't chemically bond with other elements. Instead, it moves freely through tiny pores and cracks in soil and rock, eventually rising to the surface and entering the atmosphere — or accumulating inside buildings.
Where Radon Is Found
Because uranium is present virtually everywhere in the earth's crust, radon can form anywhere. However, concentrations are higher in areas with:
- Granite and uranium-rich rock formations
- Phosphate-rich soils
- Shale and limestone deposits
- Areas with high natural radioactivity
Radon in Water
Radon can also dissolve in groundwater. When water from wells or underground sources is used in the home, radon can be released into the air during activities like showering, washing dishes, or running the tap.
The Takeaway
Radon is a natural byproduct of the earth itself. You can't stop it from forming — but you can detect it and take action to keep your indoor levels safe.
Know Your Home's Radon Level
The GZAIR Radon Detector continuously monitors radon in real time, so you always know what's happening in your home. No lab fees, no waiting — just accurate, ongoing protection.
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