Experiments on cylindrical ionization chambers operating at high‐current densities showed that more voltage was required to produce saturation when the central electrode was negative than when it was positive with respect to the outer cylinder. An analysis is made which indicates this phenomenon might be explained by the positive ion space charge. Under the condition of uniform ionization density within the chamber, a relation is developed for the ratio of voltages required to overcome the space charge for the two collection polarities. Also, approximate analyses are made for the cases of the ionizing particles originating at the surface of either electrode. There is only rough agreement between the calculations and experimental data.

J. J. Thomson, Conduction of Electricity Through Gases (Cambridge University Press, Cambridge, 1928), third edition, Vol. I.
J. W. Broxon, AECD‐3014 (1943).
John A.
Phys. Rev.
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