Radiation with enough energy to remove electrons from atoms or molecules, creating ions.
Ionizing radiation includes high-energy electromagnetic radiation such as X-rays and gamma rays, as well as certain types of particle radiation. Because it can alter atoms and molecules, it can damage DNA and other cellular structures.
Ionizing radiation has important medical uses, including X-rays, CT scans, nuclear medicine, and radiation therapy. The potential biological harm depends on factors such as the type and amount of radiation, the tissues exposed, and the duration and pattern of exposure.
QUICK FACT
Not all radiation is ionizing. Visible light, radio waves, and microwaves are examples of non-ionizing radiation.
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