Knowing that you're living with radiation sources might make you feel like there are scary dangers lurking around your home. But radioactive materials are actually found everywhere — in the earth, our ...

Humans are exposed to man-made radiation as well. The major sources are illustrated below. By far, most of the dose comes from medical x-rays.

Radiation can wreak havoc on the human body when it's exposed to high doses or for prolonged periods of time. The world understood this in horrifying detail after the Chernobyl and Fukushima Daiichi ...