Calculated for pE = 4 and T = 28 °C from pore water chemistry data with PHREEQCI version 2.12.5 using the PHREEQC.DAT thermodynamic data base (http://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/).
Natural gamma radiation (NGR) data in the ~0.1 to 3.0 MeV range were measured using eight custom-designed sodium iodide (thallium) [NaI(Tl)] detectors arranged along the core measurement axis at 20 cm