Geochemical parameters of three marine sediment cores from the Kimberley coast, north-western Australia

The concentration profiles of 210Pb were determined through the measurement of 210Po in radioactive equilibrium at Edith Cowan University. The concentrations of 137Cs were determined by gamma-ray spectrometry (Canberra Be3830) with a relative counting efficiency of 35% and an energy resolution of 1.8 keV (at 1332 keV).

Grain sizes were measured using a Malvern Mastersizer 2000F Laser Particle Sizer, after pretreated with 10% H2O2, 10% HCl and 0.05% (NaPO3)6 solution. The sterol contents were determined by GC (Agilent 7890 A) with an FID detector and a HP-1 column (50 m × 0.32 μm × 0.17 μm).