| γ-Radiation Dose (kGy) | Absorption Edge (eV) | Band Gap (eV) | Urbach Energy (eV) | |
| Direct | Indirect | |||
| Pristine | 3.15 | 3.58 | 3.04 | 0.097 |
| 20 | 3.13 | 3.57 | 3.02 | 0.117 |
| 50 | 3.12 | 3.56 | 3.00 | 0.124 |
| 117 | 3.08 | 3.53 | 2.96 | 0.156 |
| 199 | 3.06 | 3.49 | 2.92 | 0.176 |
| 500 | 3.04 | 3.44 | 2.81 | 0.229 |
| 800 | 3.02 | 3.36 | 2.74 | 0.353 |