Abstract
PHOTOGRAPHIC emulsions have been used to an increasing extent for the recording of nuclear tracks passing through the sensitive layer, in particular by Dr. C. F. Powell and his collaborators1, and by Demers2. Particles of relatively high ionizing power such as alpha-particles and protons give well-defined tracks; those of lesser ionizing power, such as mesons, yield rather tenuous tracks ; while electrons do not as a rule produce recognizable tracks in the emulsions available so far, although Demers2 claims to have seen electron tracks on one of his emulsions.
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