Fig. 4: Representative XRF spectra of ivory samples: Sample PHA (black continuous line) and sample BHA_34 (blue dotted line). | npj Heritage Science

Fig. 4: Representative XRF spectra of ivory samples: Sample PHA (black continuous line) and sample BHA_34 (blue dotted line).

From: Ancient waterlogged ivory: tracing its origin through DNA analysis and spectrometric methodologies

Fig. 4: Representative XRF spectra of ivory samples: Sample PHA (black continuous line) and sample BHA_34 (blue dotted line).

Main elements detected and corresponding lines. Peaks from elements present in the instrument, atmosphere, sum/pile-up peaks and escape peaks were not analysed. XRF conditions were accelerating voltage and current, 40.00 kV and 30.00 mA using an X-ray tube with Rhodium anode; Acquisition time: 180 s; No filter; No vacuum. Since no peak of analytical interest was observed in any of the samples above 20 keV (only rhodium and palladium peaks from Tracer), only the energy range 1–20 keV is displayed.

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