Accuracy of Approximate Solutions for Currents in a Plane Parallel Ion Chamber

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Abstract
A computer solution has been obtained for Thomsons'' equations for the electric field in a uniformly irradiated ion chamber. Results for the current-voltage relationship agree closely with those calculated by the approximate methods of Mie. In particular, Mie''s formula for the nearly saturated region is confirmed for degrees of saturation of 70% and above. The formula derived by Boag and Wilson for this region is shown to hold only for degrees of saturation above 95%. This confirms experimental results previously obtained with practical chambers.