Concentrations and environmental fate of Ra in cation-exchange regeneration brine waste disposed to septic tanks and accumulation in sludge, New Jersey Coastal Plain, USA

Concentrations of Ra in liquid and solid wastes generated from 15 softeners treating domestic well waters from New Jersey Coastal Plain aquifers (where combined Ra (²²⁶Ra plus ²²⁸Ra) concentrations commonly exceed 0.185 Bq L⁻¹) were determined. Softeners, when maintained, reduced combined Ra about 10-fold (