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Definition: Techneg ar gyfer mesur crynodiad elfennau penodol mewn sampl, drwy ddadansoddi'r golau a amsugnir gan atomau o'r elfennau hynny pan ydynt mewn cyflwr nwyol.
Notes: Term a ddefnyddir yn Rheoliadau Ychwanegion Bwyd Anifeiliaid (Awdurdodiadau) (Cymru) 2022.