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Table 4 Rc values of Th–U decay series radionuclides
From: Water–rock interactions in the Bruchsal geothermal system by U–Th series radionuclides
Isotope | Rock activity (Bq kg−1) | Rc values | Half-life |
|---|---|---|---|
238U | 18.0 | 1.5 × 103 | 4.47 × 109 y |
235U | 0.8 | > 2.1 × 102 | 7.04 × 108 y |
234U | 19.0 | 1.9 × 103 | 2.46 × 105 y |
232Th | 17.0 | > 1.7 × 103 | 1.41 × 1010 y |
230Th | 19.0 | > 2.4 × 102 | 7.54 × 104 y |
228Th | 19.0 | > 9.5 × 102 | 1.91 years |
226Ra | 43.0 | 1.5 | 1600 years |
228Ra | 17.0 | 1.1 | 5.75 years |
223Ra | 0.8 | 1.8 | 11.43 days |
224Ra | 19.0 | 1.7 | 3.66 days |
210Pb | 37.0 | 1.4 | 22.30 years |
212Pb | 19.0 | 1.2 | 10.64 h |