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Cross section. Cross-section per atom (or per electron) = ?Attenuation length l = 1/n? , where n is density of atomsAttenuation of beam I = I0 exp(-x/l)For materials, we often use the attenuation coefficient, ?, which is the cross second per mass (cm2/g)Then attenuation length l = 1/n? = 1/??, w

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