Table 1.
Characteristics of commercially available 90Y-particles
| Feature | SIR-Spheres® | TheraSphere® |
| Isotope | 90Y | 90Y |
| Half life (h) | 64.2 | 64.2 |
| Material | Resin | Glass |
| Diameter (μm) | 20-60 | 20-30 |
| Activity per particle (Bq) | 50 | 2500 |
| Spheres per 3 GBq | 40-80 × 106 | 1.2 × 106 |
| Specific Gravity (g/mL) | 1.6 | 3.2 |
| Embolic effect | Mild | Negligible |
| Contrast injection | During infusion | No |
| FDA approved indication | CRC liver metastases with intrahepatic floxuridine | HCC |
FDA: Food and Drug Administration; CRC: Colorectal cancer; HCC: Hepatocellular carcinoma.