All single phase regions (compounds and solid solutions) in the normalBaO‐normalSrO‐SiO2 system were activated with 0.01 mole percent (m/o) Ce3+ (with equimolar amounts of Li+, Na+, or K+ added to compensate charges) and the resulting ultraviolet excitation and emission spectra were characterized. Brightest phosphors were obtained from the solid solution phases in the BaSiO3‐SrSiO3 and Ba2SiO4‐Sr2SiO4 systems at the approximate compositions of false(Ba0.8,Sr0.6false)SiO3:Ce3+ , K+ and false(Ba0.2,Sr0.8)2SiO4:Ce3+ , Li+, respectively. All phosphors exhibit a peak emission wavelength at approximately 390 nm with slight variations resulting from compositional changes.

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Iron-enriched basalt (IEB) has been investigated as a containment medium for defense transuranic (TRU) and defense high-level wastes (HLW). IEB samples have been fabricated incorporating simulated and actual defense TRU wastes generated at the Rocky Flats Plant (RFP), and simulated defense high-level wastes. These samples were tested for leaching resistance and fracture toughness. Cesium and strontium volatility from an IEB melt was also assessed, using radioactively spiked samples.

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