The Ilford Q-emulsions are by far the most widely used for ion detection today. The characteristics of the emulsions used in mass spectrography, have been studied with varying results. Ilford Q<sub>1</sub> has been investigated by Brix and Dehmelt and by Burlefinger and Ewald and Ilford Q<sub>1</sub> and Q<sub>3</sub> by Lichtblau. Ilford Q<sub>2</sub> has been investigated by Owens and Ilford Q<sub>1</sub>, Q<sub>2</sub>, and Q<sub>3</sub> by Khairi and Hintenberger. These studies showed that the photographic response of the emulsions investigated is a function of both the mass and energy of the impinging ions and that dependence varies in kind and degree from one emulsion type to another.

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