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Occurrence and sources of radium in groundwater associated with oil fields in the Southern San Joaquin Valley, California
McMahon, P. B., Vengosh, A., Davis, T. A., Landon, M. K., Tyne, R. L., Wright, M. T., Kulongoski, J. T., Hunt, A. G., Barry, P. H., Kondash, A. J., Wang, Z., & Ballentine, C. J. (2019). Occurrence and sources of radium in groundwater associated with oil fields in the Southern San Joaquin Valley, California. Environmental Science & Technology, 53(16), 9398-9406. https://doi.org/10.1021/acs.est.9b02395
Geochemical data from 40 water wells were used to examine the occurrence and sources of radium (Ra) in groundwater associated with three oil fields in California (Fruitvale, Lost Hills, South Belridge). Ra-226+Ra-228 activities (range = 0.010-0.51 Bq/L) exceeded the 0.185 Bq/L drinking-water standard in 18% of the wells (not drinking water wells). Radium activities were correlated with TDS concentrations (p <0.001, p = 0.90, range = 145-15,900 mg/L), Mn + Fe concentrations (p <0.001, rho = 0.82, range =
