Abstract: A glass material that includes: from about 0.45 to about 0.86 mole fraction of SiO2; from about 0.05 to about 0.43 mole fraction of: Y2O3, BaO, or a combination of Y2O3 and BaO; and optionally Ta2O5. The sum of the Y2O3, the BaO and the optional Ta2O5 is from about 0.10 to about 0.50 mole fraction. The glass includes less than 0.01 mole fraction of Na2O and less than 0.01 mole fraction of K2O. The glass material may be in the form of microspheres. The microspheres may be used for vascular embolization and/or radiologic imaging.

Abstract: A glass material that includes: from about 0.55 to about 0.85 mole fraction of SiO2; from about 0.01 to about 0.23 mole fraction of Na2O, K2O, or a combination of Na2O and K2O; from about 0.05 to about 0.28 mole fraction of: Y2O3, BaO, or a combination of Y2O3 and BaO; and optionally Ta2O5. In the glass material, the sum of the Y2O3, the BaO and the optional Ta2O5 is from about 0.10 to about 0.31 mole fraction. The glass material may be in the form of microspheres. The microspheres may be used for vascular embolization and/or radiologic imaging.

Abstract: Provided are radiopaque compositions comprising one or more of yttrium (Y), strontium (Sr), gallium (Ga), and silicon, or oxides and salts thereof. The composition can comprise a combination of Y2O3, SrO, Ga2O3, and SiO2, and optionally MnO2, and TiO2. Other compositions comprise SrO, Ga2O3, TiO2, MnO2, and SiO2. The composition can be a particulate material. The compositions are useful for radioembolization to treat tumors.