Figure 7. Simulated RBS spectrum superimposed on the acquired spectrum (rugged line) from the point-analysis of the film-like feature (Fig. 6c). Each acquired RBS spectrum represents the total number of backscattered alpha-particles (y-axis) as a function of the energy (x-axis). Note: The diagram is slightly truncated on the x-axis (starts at 200 KeV). The energy of the backscattered alpha particles depends on the cross section of the nuclei from which the alpha particles scattered, and the depth in the sample at which the scattering event took place. The simulated total spectrum (indicated "sum sectrum") in the figure was generated by summing the simulated spectral contributions of Ca, C, and O in the sample (see lables in the figure). The dashed line indicates the shape of the simulated C curve of the spectrum from the point analysis of the adjacent calcite grain (Fig. 6b). The difference in height of the dashed versus solid curve of the simulated C spectra corresponds to a concentration difference of about three times that relative to the amount of C in an adjacent carbonate grain.
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