Table 3.
Age-depended initial red bone marrow (RBM) external dose rate, DFi,k, per unit activity of i-th radionuclide in soil (Eckerman and Ryman 1993; ICRP 2020)
| Radio-nuclide | Half-lifea | Decay product (yield) | Emitted photon energy per disintegration (MeV)a | Initial RBM external dose rate per unit ground deposition of radionuclide (μGy d−1 per kBq m−2) for age group |
|||||
|---|---|---|---|---|---|---|---|---|---|
| Newborn | 1 year | 5 year | 10 year | 15 year | Adult | ||||
| 95Zr | 64.032 d | 95Nb (0.993) | 0.732 | 6.51 × 10−2 | 5.83 × 10−2 | 5.37 × 10−2 | 4.93 × 10−2 | 4.63 × 10−2 | 4.47 × 10−2 |
| 95Nb | 34.991 d | 0.765 | 6.81 × 10−2 | 6.08 × 10−2 | 5.61 × 10−2 | 5.15 × 10−2 | 4.85 × 10−2 | 4.66 × 10−2 | |
| 99Mob | 65.94 h | 0.148 | 2.15 × 10−2 | 1.93 × 10−2 | 1.77 × 10−2 | 1.63 × 10−2 | 1.52 × 10−2 | 1.47 × 10−2 | |
| 103Rub | 39.26 d | 0.496 | 4.07 × 10−2 | 3.67 × 10−2 | 3.39 × 10−2 | 3.08 × 10−2 | 2.88 × 10−2 | 2.80 × 10−2 | |
| 106Rub | 373.59 d | 0.206 | 1.77 × 10−2 | 1.59 × 10−2 | 1.46 × 10−2 | 1.33 × 10−2 | 1.23 × 10−2 | 1.19 × 10−2 | |
| 132Te | 3.204 d | 132I (1.0) | 0.234 | 1.80 × 10−2 | 1.62 × 10−2 | 1.49 × 10−2 | 1.34 × 10−2 | 1.25 × 10−2 | 1.17 × 10−2 |
| 131I | 8.02 d | 0.383 | 3.32 × 10−2 | 2.97 × 10−2 | 2.76 × 10−2 | 2.50 × 10−2 | 2.33 × 10−2 | 2.23 × 10−2 | |
| 132I | 2.295 h | 2.265 | 2.00 × 10−1 | 1.79 × 10−1 | 1.65 × 10−1 | 1.52 × 10−1 | 1.42 × 10−1 | 1.38 × 10−1 | |
| 133I | 20.8 h | 0.612 | 5.30 × 10−2 | 4.76 × 10−2 | 4.38 × 10−2 | 4.01 × 10−2 | 3.74 × 10−2 | 3.63 × 10−2 | |
| 135I | 6.57 h | 1.582 | 1.34 × 10−1 | 1.21 × 10−1 | 1.12 × 10−1 | 1.04 × 10−1 | 9.80 × 10−2 | 9.50 × 10−2 | |
| 134Cs | 2.065 y | 1.555 | 1.36 × 10−1 | 1.21 × 10−1 | 1.12 × 10−1 | 1.03 × 10−1 | 9.63 × 10−2 | 9.33 × 10−2 | |
| 136Cs | 13.16 d | 2.128 | 1.89 × 10−1 | 1.70 × 10−1 | 1.57 × 10−1 | 1.45 × 10−1 | 1.36 × 10−1 | 1.31 × 10−1 | |
| 137Csb | 30.167 y | 0.596 | 4.94 × 10−2 | 4.41 × 10−2 | 4.08 × 10−2 | 3.72 × 10−2 | 3.49 × 10−2 | 3.39 × 10−2 | |
| 140Ba | 12.752 d | 140La (1.0) | 0.183 | 1.54 × 10−2 | 1.39 × 10−2 | 1.28 × 10−2 | 1.16 × 10−2 | 1.08 × 10−2 | 1.05 × 10−2 |
| 140La | 1.678 d | 2.308 | 2.00 × 10−1 | 1.80 × 10−1 | 1.67 × 10−1 | 1.55 × 10−1 | 1.45 × 10−1 | 1.41 × 10−1 | |
| 141Ce | 32.508 d | 0.0768 | 5.66 × 10−3 | 5.17 × 10−3 | 4.73 × 10−3 | 4.27 × 10−3 | 3.99 × 10−3 | 3.78 × 10−3 | |
| 144Ceb | 284.9 d | 0.0194 | 4.26 × 10−3 | 3.87 × 10−3 | 3.56 × 10−3 | 3.19 × 10−3 | 2.95 × 10−3 | 2.80 × 10−3 | |
| 239Np | 2.3565 d | 0.185 | 1.29 × 10−2 | 1.18 × 10−2 | 1.09 × 10−2 | 9.86 × 10−3 | 9.23 × 10−3 | 8.70 × 10−3 | |
b
Dose rate includes contribution from the short-lived progeny 99mTc, 103mRh, 106Rh, 137mBa, and 144Pr of 99Mo, 103Ru, 106Ru, 137Cs, and 144Ce, respectively, assuming that they are in radioactive equilibrium