|
| 40K | 232Th | 238U |
| mean concentration of uterine element in 1 g of soil | 0.420 | 0.045 | 0.003 |
| half life (T1/2) in years | 1.28 × 109 | 1.40 × 1010 | 4.47 × 109 |
| number of radionuclides in series | 1 | 9 | 14 |
| content in the earth’s crust | 7.3 × 1024 | 7.8 × 1023 | 5.7 × 1023 |
| the content in the water of the oceans | 1.6 × 1022 | 3.5 × 1019 | 7.9 × 1020 |
| content in 1 km3 of soil | 8.4 × 1014 | 8.1 × 1014 | 9.2 × 1014 |