Abstract
To investigate the possibility of quantitative correlative proton microprobe (PMP) and electron microprobe (EMP) analysis of biological soft tissue, model specimens were analyzed by both techniques. The specimens consisted of freeze-dried sections of gelatin containing known concentrations of nickel chloride. Both for PMP and for EMP, the signal was expressed as the ratio of the characteristic intensity and the continuum intensity in a peak-free region of the spectrum. With both techniques, calibration curves (signal versus known concentration) obtained, showed a deviation from linearity at high nickel concentrations. However, a linear relation (correlation coefficient 0.996) was obtained in a plot of EMP signal versus PMP signal. This indicates that quantitative correlative PMP and EMP analysis can be carried out by using the same standard for both analytical techniques.
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