What is the main source of natural radiation exposure to humans?

Radon gas is recognized as the main source of natural radiation exposure to humans. It is a colorless, odorless gas that occurs as a result of the radioactive decay of uranium found in soil and rocks. When radon gas is released from these materials, it can accumulate in homes and other buildings, especially in enclosed spaces like basements.

The health risks associated with radon exposure are significant; prolonged inhalation of radon gas can lead to lung cancer, making awareness and mitigation efforts crucial in areas where radon levels are high. Understanding the prominence of radon as a natural radiation source is essential for effective radiation safety practices in dental and medical environments, as well as in general public health strategies.

While cosmic rays from space and x-rays from machines contribute to radiation exposure, they generally do not account for as much cumulative exposure as radon gas. Tanning beds, on the other hand, emit ultraviolet radiation, which is different from ionizing radiation, and is primarily associated with skin damage rather than the overall radiation exposure considered in this context.