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Two air-filled cavity ionization chambers are identical except that one has an aluminium wall and the other graphite. The walls are thicker than the maximum

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Two air-filled cavity ionization chambers are identical except that one has an aluminium wall and the other graphite. The walls are thicker than the maximum secondary-electron range for 1 MeV photons, which are negligibly attenuated. Calculate the approximate ratio of charge generated in the two chambers, assumed to be BG cavities

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