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the atomic absorption cross section for 616 KeV rays in aluminium for photoelectric effect and Compton scattering are respectively, 4.0 and 8.1b.calculate how much intensity

the atomic absorption cross section for 616 KeV rays in aluminium for photoelectric effect and Compton scattering are respectively, 4.0 and 8.1b.calculate how much intensity of the beam will be reduced by 3.79 CM ^ -2 thickness of the aluminium ?

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