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Table 12 Model-derived rate constants of adsorption (k1) and desorption (k2); dissolution (kw) and precipitation (kp) of radium and the related in situ retardation factors (Rr) due to sorption processes and (R*f ) due to sorption processes as well as co-precipitation

From: Water–rock interactions in the Bruchsal geothermal system by U–Th series radionuclides

Isotopes of Ra k1,Ra (s−1) k2,Ra (s−1) Rf,Ra () kw,Ra (s−1) kp,Ra (s−1) R*f,Ra ()
226Ra 6.0 × 10−10 2.2 × 10−9 1.3 2.3 × 10−8 3.4 × 10−8 2485
228Ra 1.1 10
223Ra 1.0 1.0
224Ra 1.0 1.0