Which among the following elements is the largest naturally occurring source of radiation?

Name: Which among the following elements is the largest naturally occurring source of radiation?
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Radon is the largest naturally occurring source of radiation. It is a colorless, odorless, and tasteless radioactive gas that is formed by the decay of uranium and thorium in soil, rock, and water. It can accumulate in enclosed spaces such as homes and become a health hazard if inhaled over long periods of time.

Which Among the Following Elements Is the Largest Naturally Occurring