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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 |