An experimental determination has been made of the radial and longitudinal distribution of energy produced in showers initiated by electrons of 118 Mev and 157 Mev in copper. A small crystal CsBr(Tl) coupled to a thin light pipe and photomultiplier was used as a probe. Graphs of the radial distributions are given from which, by numerical integration, transition curves are determined. Calculations are made for an approximately optimum design of scintillation crystal [e.g., NaI(Tl)] to capture a large fraction of the energy within a shower.
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Kantz et al. (1953) studied this question.
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