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Table 10 Recoil efficiency for radium (eRa) relative to 222Rn (data originate from Krishnaswami et al. 1982) as well as model-derived rates of alpha-recoil supply (Pr) for the geothermal system in Bruchsal

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

Decay eRa () Pr (atoms kg−1 s−1)
230Th → 226Ra 0.961 40
232Th → 228Ra 0.769 25
227Th → 223Ra 0.961 1.7
228Th → 224Ra 0.897 41