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In page Selenium:
"Zinc selenide was the first material for blue LEDs, but gallium nitride dominates that market.[6] Cadmium selenide was an important component in quantum dots.[citation needed] Sheets of amorphous selenium convert X-ray images to patterns of charge in xeroradiography and in solid-state, flat-panel X-ray cameras.[7] Ionized selenium (Se+24, where 24 of the outer D, S and P orbitals are stripped away due to high input energies) is one of the active mediums used in X-ray lasers.[8] 75Se is used as a gamma source in industrial radiography.[9]
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