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. 2017 Sep 7;24(3):1073274817729244. doi: 10.1177/1073274817729244

Table 1.

Physical Properties of Commercially Available Y90 Microspheres.

Y90 Glass Microspheres (TheraSphere) Y90 Resin Microspheres (SIR-Spheres)
Microsphere mean diameter 25 ± 10 μm 35 ± 10 μm
Matrix Insoluble glass Insoluble resin
Density 3.6 g/dL 1.6 g/dL
Mean radioactivity per microsphere 2500 Bq 50 Bq
Number of microspheres per 3 GBq 1.2 million 60 million
Activities available 3, 5, 7, 10, 15, 20 Bq 3 Bq
Spheres per vial 1.2-8 million 40-80 million
Embolic effect Mild Moderate