Characteristic X-ray

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Notion

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Science and technology

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What Wikipedia says

Characteristic X-rays are emitted when outer-shell electrons fill a vacancy in the inner shell of an atom, releasing X-rays in a pattern that is "characteristic" to each element. Characteristic X-rays were discovered by Charles Glover Barkla in 1909, who later won the Nobel Prize in Physics for his discovery in 1917.

Excerpt from the Wikipedia article “Characteristic X-ray”, under the CC BY-SA 4.0 license. Read the article on Wikipedia