Abstract
The problem of the photon sensitivity of emulsion crystals is reviewed and is seen to rest on interpretation of the characteristic curve. A partial-development technique for the identification of grains hearing latent image is used to determine characteristic curves for effectively mono-sized classes of grains in a fast medical X-ray film given monochromatic exposure. The characteristic curve of a pure-bromide nominally monodisperse emulsion is also shown for monochromatic exposure. Characteristic curves of the two emulsions are analyzed according to models which assume, respectively, a unique photon sensitivity and efficiency factor, and the existence of a spread of effective photon sensitivities. Conclusions are drawn concerning the success of the partial development technique and of the analytical methods, the photon sensitivities found and the minimum size of latent image.
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