Measurements have been made of the transmission through aluminium foils of an electron beam of initially monochromatic energy in the range 0.25-0.75 MeV. The current of transmitted electrons was measured directly, with a collecting cup and a galvanometer, this procedure yielding transmission curves of different shape from those obtained using Geiger counters or ionization chambers. The extrapolated range-energy relationship under these conditions also departs considerably from the generally accepted curve.
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Agu et al. (1958) studied this question.
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