Electron Energy Studies with the Anthracene Scintillation Counter

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Abstract
Using a β‐ray lens spectrometer to supply electrons of a given energy, a study of the response of the anthracene scintillation counter to monoenergetic electrons has been made. It has been found that pulse height varies linearly with energy from 125 to 3200 kev but below 125 kev the pulse height varies less rapidly with energy. The differential counting rate distribution for given energy settings of the lens spectrometer were found to follow a Gaussian distribution and that on the average 3.3 kev is required to produce one effective photo‐electron at the cathode. When Morton's correction for dynode losses is applied, it is found to require 2.5 kev for the production of one photo‐electron at the cathode or that 400 electrons enter the multiplier per Mev of incident electron energy. This is in agreement with the 420 electrons per Mev obtained by direct measurement. Assuming a 10 percent photoelectric efficiency at the photo‐sensitive surface, it appears that the efficiency of anthracene for the conversion of incident electron energy into photon energy is of the order of one to two percent.

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