<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">x-ray</topic></authority><related type="other"><topic>x-radiography</topic></related><related type="other"><topic>x-radiographs</topic></related><related type="broader"><topic>electromagnetic radiation</topic></related><variant type="other"><topic>Roentgen rays</topic></variant><variant type="other"><topic>X-ray</topic></variant><variant type="other"><topic>X-rays</topic></variant><variant type="other"><topic>x-rays</topic></variant> <note xml:lang="en"><![CDATA[ High energy radiation (from some keV to 110 keV) with very short wavelengths (0.001 - 10 nm). X-rays were discovered by Wilhelm Conrad Röntgen in 1895. They can pass through materials, ionize gases, and expose photographic film. Widely used in medical diagnosis and treatment and in many analytical techniques. ]]></note></mads>