Abstract
The effect on the electric field inside a circular‐cylindrical ionization chamber of the end plates is determined. The field lines terminating on the collecting wire at the ends of the guard sleeves determine the volume in which the freed electrons are collected by the wire. Formulas and a graph for determining this counting volume are exhibited. In appendices effects of the sleeves are considered, and the inverse‐square integral evaluated for both cylindrical and spherical ionization chambers.

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