Yttrium aluminosilicate (YAS) glasses with an yttrium oxide content of up to 23% (molar content) have been obtained, and their properties have been studied. Microspheres with a diameter of 20 - 32 microns have been manufactured for use in brachytherapy. Microspheres are characterized by a completely amorphous structure without the presence of any crystalline inclusions, high shape isometry (particle asphericity less than 5%) and high chemical resistance. Tab. 2, ill. 9, bibliography: 19 titles.
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