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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
  1. Rc is defined as the ratio of rock activity relative to average fluid activity (cf. Table 3)