The output pulse heights obtained from E M I. photomultipliers are found not always to be proportional to the quantity of light incident on the photo-surface of the photomultiplier The photomultiplier ceases to be a linear amplifier of the incident light pulses when the charge density in the multiplier becomes too great The relation between pulse height and energy loss of alpha-particles in various fluorescent materials has been determined at low values of charge density.
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Raffle et al. (1952) studied this question.
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