When low-energy X-rays are used, the attenuation coefficient is (roughly) proportional to the cube of the

When low-energy X-rays are used, the attenuation coefficient μ is (roughly) proportional to the cube of the proton number Z of the absorbing material. Use the data in Table 30.2 to show that bone absorbs X-rays eight times as strongly as muscle.

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Maximum X-ray energy Bone: u / cm-1 Muscle: u / cm-1 4.0 MeV 0.087 0.049 250 keV 0.32 0.16 100 keV 0.60 0.21 50 keV 3.32 0.54