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- W7183267 abstract "Samples of yellow glass dinnerware produced by twelve different U.S. companies during the 1930`s-1950`s have been found to contain thorium. The presence of thorium in glass has not previously been reported in the literature. The colorant in the yellow is cerium, obtained from thorium-rich monazite sands. Incomplete chemical separation has resulted in accidential addition of significant quantities of thorium to the glasses. Thorium glass can be identified by gamma-ray spectroscopy, but it is simpler and cheaper to distinguish between thorium glass and other radioactive glasses (uranium glasses and potassium-40 glasses) by use of a Geiger counter. A 0.5-cm thickness of aluminum shielding between the glass and detector reduces gamma-ray counts from uranium-containing or {sup 40}K-containing glasses to less than 1% of the unshielded radiation. In contrast, identical shielding allows 10% of the unshielded thorium radiation to reach the counter. Visible absorption spectra and fluorescence properties of yellow thorium glasses are also different from those of uranium glasses." @default.
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- W7183267 date "1995-12-31" @default.
- W7183267 modified "2023-09-24" @default.
- W7183267 title "Thorium in collectible glassware" @default.
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