CeramicsGlazes used for tiles, pottery, and other ceramics made before the 1960’s, often contain elevated levels of naturally-occurring radionuclides. Manufacturers typically used uranium,thorium, and/or potassium-40, all of which emit alpha, beta, and gamma radiation. As recently as the 1930s, Fiestaware® used uranium oxides to create the distinctive orange-red color of its dinnerware.from Redtown US, Radioactive Materials in Antiqueshttp://www.epa.gov/radtown/antiques.html#ceramics展开
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