LETTERS TO THE EDITOR 763attributed to the photo-multiplier crystal combination, it may possibly represent a lack of exact linearity in the crystal light output-energy relationship for low energies.In Fig. 2(D) is shown the 29-kev x-ray of Xe, obtained with a somewhat larger gain setting of the linear amplifier. From the resolution of this low energy line (50 percent), and other considerations, it has been possible to reconstruct approximately the pulseheight scale in terms of the numbers of electrons collected from the cathode. It is interesting to note that the noise level rises rapidly only below pulse heights corresponding to 3 or 4 electrons collected by the first dynode (or approximately 5 kev on the calibration curve 5 ).
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