Version July 2025
| Thallium-201 | Technetium-99m | |
| Dose | 2-4 mCi | 20-30 mCi |
| Photon energy | 69-83 keV | 140 keV |
| Half-life | 73 hours | 6 hours |
| Availability | Cyclotron-produced | Generator produced; often available on site |
| Significant redistribution | Yes | No |
