Abstract
Measurements have been made of the amount of sub-image grains present in photographic films after exposure to Υ-rays from a Cobalt 60 source. It has been found that the ratio of grains with sub-images to those with a full latent image was low when the mean grain size of the emulsion was more than 0.5 microns in diameter but rose rpaidly to values above unity for emulsions having mean grain sizes less than 0.4 microns. The results show that on average the electrons produced by the Υ-rays must travel at least 0.3 microns within a grain of the emulsion to produce a latent image. It also follows that grains of diameter less than 0.3 microns need to interact with more than one high energy electron to produce a latent image.
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