HVLs for many isotopes commonly used in nuclear medicine
| Radioisotope | Main energy (keV) | HVL of Pb (cm) |
|---|---|---|
| 99mTc | 140 | ∼0.02 |
| 131I | 364 | ∼0.30 |
| 133Xe | 81 | ∼0.03 |
| 111In | 245 | ∼0.10 |
| 137Cs | 662 | ∼0.65 |
| 201Tl | 70 | ∼0.03 |
| 125I | 35.5 | ∼0.01 |
Data were obtained from online sources (4,5).