Radon is particularly prevalent in which rock type?

Radon is particularly prevalent in which rock type?

• A. Granite
• B. Marble
• C. Basalt
• D. Limestone

Answer: (A)

Radon levels indoors are driven by the amount of uranium in the surrounding rocks and soils and how easily the gas can move through them. Granite often contains more uranium-bearing minerals than the other rock types listed, so soils and rocks derived from granite tend to release more radon. Because radon is a gas that can seep into homes from the ground, areas built on or over granite bedrock are more likely to have higher radon potential. Marble, limestone, and basalt generally have lower uranium content, so they are less associated with elevated radon.

Radon levels indoors are driven by the amount of uranium in the surrounding rocks and soils and how easily the gas can move through them. Granite often contains more uranium-bearing minerals than the other rock types listed, so soils and rocks derived from granite tend to release more radon. Because radon is a gas that can seep into homes from the ground, areas built on or over granite bedrock are more likely to have higher radon potential. Marble, limestone, and basalt generally have lower uranium content, so they are less associated with elevated radon.