Abstract
THERE are many problems in aerosol work in the nuclear energy field in which it is important to be able to distinguish radioactive from non-radioactive particles. This has led to the development of methods1 for track autoradiography of particles by transmitted light microscopy. Nuclear emulsions can give better resolution than that attainable with an optical microscope, and extension of techniques to electron microscopy is logical. But the gelatine which remains after photographic processing absorbs the electrons and limits the thickness of emulsion which can be used.
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