[en] This paper describes a novel approach for preparation of scandium oxide-glass microspheres for use as radiotracer in radioactive particle tracking (RPT) experiments conducted for flow visualization in industrial systems. The approach involves preparation of scandium (1 % Sc₂O₃) glass, crushing the glass into small particles of different sizes, converting the non-spherical particles into spherical particles using an indigenously developed novel approach. The obtained spherical glass microspheres were irradiated with thermal neutrons in a nuclear reactor and the activity of Scandium-46 was measured. The activity of the scandium glass microsphere of size 500-1500 μm was found to be 40-325 μCi. (author)