Here's the breakdown:
* Uranium-238 decays through a series of steps to radium-226.
* Radium-226 then decays to radon-222.
* Thorium-232 also decays through a series of steps, ultimately leading to the production of radon-220.
The decay process is a natural phenomenon that occurs within the Earth's crust. Radon gas can then seep into homes and buildings through cracks and gaps in the foundation.
Here's a simplified diagram:
Uranium-238 -> Radium-226 -> Radon-222
Thorium-232 -> ... -> Radon-220
It's important to note that radon is a naturally occurring radioactive gas, and it's impossible to eliminate it completely. However, it's important to test your home for radon levels and take steps to mitigate high levels if necessary.