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Dependence of the X-Ray Photoacoustic Signal Intensity of Pure Copper and Brass on Sample Thickness

The hard X-ray photoacoustic signal intensities (I) of pure copper and brass have been measured in the Cu K-edge region as a function of sample thickness (d) (from 5 µm to 100 µm). It is shown that the photoacoustic signal intensities of pure copper and brass decrease above the sample thickness of 10 µm for each modulation frequency. The absolute values of the power law, d(ln I)/d(ln d), of pure copper and brass depend on modulation frequency.