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

Geothermal Energy

Science – Society – Technology

Table 5 Radium activities and activity ratios in brine collected from GB2 well (measurement campaign 2016/2017)

Sample no.	Sampling date	²²⁶Ra	²²⁸Ra	²²⁴Ra	²²³Ra	²²⁸Ra/²²⁶Ra	²²⁴Ra/²²⁸Ra	²²³Ra/²²⁶Ra
GB2-p1z1-001	13.10.2016	28.8 ± 2.4	15.2 ± 0.8	10.6 ± 0.6	0.41 ± 0.25	0.53 ± 0.07	0.70 ± 0.08	0.01 ± 0.01
GB2-p1z1-002	18.10.2016	27.6 ± 2.6	14.9 ± 0.8	10.0 ± 0.4	0.37 ± 0.22	0.54 ± 0.08	0.67 ± 0.06	0.01 ± 0.01
GB2-p1z1-003	24.10.2016	28.1 ± 2.4	15.5 ± 0.8	10.4 ± 0.4	0.48 ± 0.29	0.55 ± 0.08	0.67 ± 0.06	0.02 ± 0.01
GB2-p1z1-004	28.10.2016	29.3 ± 2.8	16.4 ± 0.9	11.5 ± 0.6	0.53 ± 0.32	0.56 ± 0.08	0.70 ± 0.08	0.02 ± 0.01
GB2-p1z1-005	04.11.2016	27.2 ± 2.2	16.1 ± 0.8	9.0 ± 2.0	0.74 ± 0.44	0.59 ± 0.08	0.56 ± .15	0.03 ± 0.02
GB2-p1z1-006	16.11.2016	28.0 ± 2.4	15.3 ± 0.8	10.4 ± 0.6	0.51 ± 0.31	0.55 ± 0.08	0.68 ± 0.07	0.02 ± 0.01
GB2-p1z1-007	17.01.2017	29.5 ± 2.4	15.5 ± 0.8	10.1 ± 0.8	0.61 ± 0.37	0.53 ± 0.07	0.65 ± 0.09	0.02 ± 0.01
GB2-p1z1-008	04.04.2017	30.3 ± 2.2	16.0 ± 0.7	10.3 ± 0.4	0.32 ± 0.19	0.53 ± 0.06	0.64 ± 0.05	0.01 ± 0.01
GB2-p1z1-009	11.04.2017	32.0 ± 2.4	16.7 ± 0.9	9.7 ± 1.0	0.36 ± 0.22	0.52 ± 0.07	0.58 ± 0.09	0.01 ± 0.01
GB2-p1z1-010	27.04.2017	29.9 ± 2.4	16.0 ± 0.8	10.6 ± 0.6	0.44 ± 0.26	0.54 ± 0.07	0.66 ± 0.07	0.02 ± 0.01
GB2-p1z1-011	02.05.2017	27.8 ± 2.4	16.4 ± 0.8	10.7 ± 0.4	0.50 ± 0.30	0.59 ± 0.08	0.65 ± 0.06	0.02 ± 0.01
GB2-p1z1-012	08.05.2017	28.9 ± 2.4	16.2 ± 0.8	11.1 ± 0.4	0.43 ± 0.26	0.56 ± 0.07	0.69 ± 0.06	0.02 ± 0.01
GB2-p1z1-013	15.05.2017	30.0 ± 2.4	16.1 ± 0.8	10.1 ± 0.4	0.45 ± 0.27	0.54 ± 0.07	0.63 ± 0.06	0.02 ± 0.01

Measured values are reported in Bq kg⁻¹. The quoted errors are 2σ-deviations derived from counting statistics