Table 1 Microsphere characteristics
Microsphere type | Ho-PLLA-MS | TheraSphere® | SIR-Spheres® |
|---|---|---|---|
Matrix material | PLLA | Glass | Resin |
Isotope | 166Ho | 90Y | |
Physical half-life (h) | 26.8 | 64.1 | |
Υ-energy (keV) | 81 | no Υ-emission | |
β-energy (MeV) | 1.77 (48.7%) 1.85 (50.0%) | 2.28 (99.9%) | |
Neutron absorption cross-section (barn) | 64 | 1.3 | |
Activity/sphere (Bq) | ≤ 450 | 2500 | 50 |
n particles instilled | 33 million | 4 million | 50 million |
Density (g/ml) | 1.4 | 3.3 | 1.6 |