Sampling locations and concentrations of Radium
Detailed Description
Sampling locations, combined Ra (226Ra + 228Ra) concentrations and estimated mean groundwater ages. Areas without grid cells are too saline for potability. (Figure 1 from Radium mobility and the age of groundwater in public-drinking-water supplies from the Cambrian-Ordovician aquifer system, north-central USA).
Sources/Usage
Public Domain.