Which element is a major source of background radiation?

Name: Which element is a major source of background radiation?
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Radon is a significant source of natural background radiation. It is a radioactive gas that comes from the decay of uranium found in nearly all soils and rocks. Radon gas can accumulate in buildings, especially in confined areas such as basements and ground floors, leading to increased levels of exposure.

Which Element Is a Major Source of Background Radiation