Abstract
By calculating approximately the amplitude distribution of the pulses forming the background noise of a photomultiplier tube, it appears possible to eliminate most of this by introducing an amplitude-discriminating step into the system and then using a counting rate meter as the indicating instrument. This method has considerable advantages over the normal use of a photo-multiplier cell and the integration time of the counting rate meter can be adjusted to give appropriate sensitivity to the detector even for very faint sources. The linearity of the system has been checked, and its performance is illustrated by the record of the spectrum of a mercury vapour lamp.
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