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Radiation is often misunderstood. A fire burning in your fireplace gives off radiation. You feel it as heat. But radiation can be pooled into two distinct camps: Non-Ionizing, and Ionizing. IR, what you feel as heat is non-ionizing.
An MRI uses non-ionizing radiation... think radio waves or microwave ovens. These use electromagnetic radiation at Frequencies that can heat things up but lack energy to break apart atoms. The band extends up into visible light and a bit beyond.
An X-Ray or CT Scan uses ionizing radiation. Think UVA and UVB that burn skin and can disrupt chromosomes and thus cause cancer; and then even higher electromagnetic frequencies that do have the energy to break apart or ionize atoms. X-Rays being the most common we hear about, but also include gamma and other types (yes, there is such a thing as delta radiation).
