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It has been shown that good quality radiographic images can be formed by allowing the X-ray beam transmitted through an object to fall on an ionization chamber in which a layer of gas or liquid is confined between conducting surfaces. The ions formed by X-ray absorption in this layer are collected on an insulating foil lying over one of the electrodes, and the resulting charge distribution on the foil can then be developed by one of the toner techniques common in Xerography.There are many parameters which can be varied both in the design of the ionography chamber and in the development process. This paper considers the choice of these various parameters with a view to optimizing sensitivity and resolution and discusses in detail the efficiencies of different ionographic absorbers relative to selenium, the absorber used in Xeroradiography.