Time-Integrated Activity Coefficients at Different Stages of Gestation
| Gestational week | Coefficient (Bq-h/Bq) |
| 5 (early pregnancy) | 0.00217 |
| 10 | 0.00222 |
| 13 (3 mo) | 0.00241 |
| 15 | 0.00281 |
| 20 | 0.00876 |
| 23 | 0.02219 |
| 25 | 0.03446 |
| 26 (6 mo) | 0.03985 |
| 30 | 0.05083 |
| 39 (9 mo) | 0.05325 |