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Ul'traruskedsinine sädegoičend
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Ul'traruskedsinine sädegoičend vai URS-sädeged (latin.: ultra «ülä», «röunoiden taga» + ruskedsinine) om elektromagnitine sädegoičend, kudamb otab spektran diapazonad nägujan i röntgensädegoičendoiden keskes. URS-sädegoičend lainhiden pidused oma 100..400 nm keskustas (7,5⋅1014..3⋅1016 Hc).
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