Bi YanYan, a senior engineer at the China Geological Museum, explained that ionizing radiation can be further divided into artificial radiation and natural radiation, with the latter also known as background radiation. Artificial radiation mainly comes from the application of nuclear technology by humans, such as radiation generated by CT scanning equipment. Background radiation is the radiation that has long existed in nature, mainly from cosmic rays and radioactive nuclides in the earth's crust, which have been present on Earth for longer than humans.
Aviation radiation is the result of cosmic rays penetrating the Earth's atmosphere. These cosmic rays typically have very high energy and travel through space at nearly the speed of light. The equatorial regions receive the least cosmic radiation, while the polar regions receive the most.
