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Table 6 Radium activities (Bq kg−1) and their ratios measured in August 1986 from a brine sample collected from GB2 production well

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

Ra isotopes Activity in brine
224Ra 9.1 ± 1.6
228Ra 12.1 ± 1.1
226Ra 22.9 ± 1.8
Isotopic ratio Activity in brine
224Ra/228Ra 0.75 ± 0.20
228Ra/226Ra 0.53 ± 0.09
  1. Reported errors are 2σ uncertainties. Data are provided by EnBW and corrected for the site-specific fluid density of ρb = 1023.24 kg/m3