Emulsion variations on special-purpose spectrographic plates for detection of ions or invisible radiation greatly complicate use of these plates in quantitative analysis. Indexing by visible light is a useful technique for investigating emulsions, and a convenient apparatus has been
constructed for exposing bands of full plate width to light under controlled conditions in such a manner that they do not overlap mass spectral lines. Plates with major emulsion irregularities can be identified by darkroom inspection prior to use, but index bands offer a means of permanent
identification of the more important nonuniformities. Indexing techniques are also useful for mass marking, for comparing "in-batch" and "batch-to-batch" variations of plates, and as an aid in evaluating plate characteristics and processing variables.
Applied Research Laboratory, United States Steel Corporation, Monroeville, Pennsylvania 15146
Publication date: January 1, 1966
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