| Description |
x, 58 leaves : illustrations ; 29 cm |
| Summary |
"The glass formation region of the Ho₂O₃·Al₂O₃·SiO₂ system was determined to extend from 9 to 30 mole percent Ho₂O₃. The chemical durability of these glasses was examined in physiological solutions to determine the feasibility of their use for in-vivo radiotherapeutic applications. The dissolution rates of bulk glass specimens were barely measurable in distilled water at 37 or 70 °C, but increased with temperature and with the substitution of Ho₂O₃ for Al₂O₃ or SiO₂ in 0.1 N HCl. Both glass surface analysis by EDS and solution analysis by ICP showed that little if any holmium leached from bulk glass specimens or microspheres into the distilled water or saline solution at 37 or 70 °C. EDS and ICP also indicate that the predominant corrosion mechanism in 0.1N HCl is dependent on glass composition and temperature. The density, refractive index, thermal expansion, and Vickers hardness increased with Ho₂O₃ content. The structure of the glasses was examined by FTIR"--Abstract, page iv. |
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