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<p><b>X-ray fluorescence</b> (<b>XRF</b>) is the emission of characteristic "secondary" (or fluorescent) <a href="page.php?w=X-rays">X-rays</a> from a material that has been excited by being bombarded with high-energy X-rays or <a href="page.php?w=gamma_rays">gamma rays</a><b>.</b> When a material is illuminated with high-energy <a href="page.php?w=X-ray">X-ray</a>s, its atoms can become excited and emit their own unique, characteristic X-rays--a process similar to how a blacklight makes certain colors fluoresce. By measuring the energy and intensity</p><p>
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