Which environmental source can contribute to exposure from radiation?

Both solar radiation and radon gas are significant environmental sources that contribute to radiation exposure.

Solar radiation, which comes from the sun, comprises a variety of electromagnetic radiation, including ultraviolet (UV) rays, visible light, and infrared radiation. While solar radiation is essential for life, it also serves as a natural source of radiation exposure for all living organisms.

Radon gas, on the other hand, is a naturally occurring radioactive gas formed from the decay of uranium in soil, rock, and water. It can accumulate in enclosed areas such as homes and buildings, leading to increased exposure for the occupants. Radon is recognized as a significant contributor to indoor radiation exposure, and long-term exposure to radon gas is linked to an elevated risk of lung cancer.

Therefore, since both sources significantly contribute to radiation exposure, the correct answer is that both solar radiation and radon gas are environmental sources of radiation exposure. This dual acknowledgment highlights the complexity of radiation exposure assessment and the various ways individuals may come into contact with radiation in their environment.