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How does a 10 MeV cosmic Ray photo lose energy while passing through atmosphere? The absorption cross-section for Alumunium (Al) for 1.0 MeV gamma rays

How does a 10 MeV cosmic Ray photo lose energy while passing through atmosphere? The absorption cross-section for Alumunium (Al) for 1.0 MeV gamma rays is 10 bar per atom. What is the linear attenuation coefficient of aluminium these gamma rays ? Consider the density of Aluminium is 2.3 g cm^-3.

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