Are we really exposed to radiation in our everyday life?
Radiation is a natural part of life. Radiation is light, short radio waves, ultraviolet or x-rays. It has existed since the beginning of time and is an integral part of the universe in which we live. Life on earth has evolved in the presence of radiation. Radiation comes to us from many sources both natural and man-made. These sources include cosmic radiation from outer space, radiation from the soil and buildings, and natural isotopes in our own bodies. Cosmic radiation and terrestrial radiation vary with location.