How much radiation dose does granite counter tops have?

Granite countertops can emit low levels of naturally occurring radiation due to the presence of uranium, thorium, and potassium-40 in the stone. However, the radiation dose from granite countertops is generally very low, typically equivalent to or lower than the background radiation people are exposed to from natural sources in their environment. Studies have shown that the radiation levels from granite countertops are not considered a significant health risk. Overall, the radiation exposure from granite countertops is minimal and comparable to that from other common household items.