My aunt's house in Canada has a radon issue in basement. House is about 150 years old. Rock for the foundation came from a mine that later became an uranium mine!
Federal government plastered walls with something special, put in concrete floor replacing dirt, nice. Then as Tinman states a fan running 24/7. Electricity for fan is not metered with house.
Every year a tech comes to check levels and be sure the fan is running.
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