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The mass attenuation coefficient of Pb for 70 keV photons is 3.0 cm 2 g -1 and the mass energy- absorption coefficient is 2.9 cm

The mass attenuation coefficient of Pb for 70 keV photons is 3.0 cm²g^-1and the mass energy- absorption coefficient is 2.9 cm²g^-1. Why are these two values almost equal?

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