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Table 11 Model-derived rates of diffusional flux FRa as a function of the effective diffusion length \(\varvec{ }(\phi^{\varvec{*}} \varvec{ }\sqrt {D_{m} /\lambda }\)) for radium isotopes
From: Water–rock interactions in the Bruchsal geothermal system by U–Th series radionuclides
Decay | \(\phi^{\varvec{*}} \varvec{ }\sqrt {D_{m} /\lambda } (cm)\) | FRa (atoms cm−2 s−1) |
|---|---|---|
230Th → 226Ra | 69 | 1.3 × 10−1 |
232Th → 228Ra | 4.2 | 2.9 × 10−2 |
227Th → 223Ra | 0.3 | 3.5 × 10−4 |
228Th → 224Ra | 0.2 | 5.3 × 10−3 |