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Photographic Calibrations for Emission Spectrography Using a Small Computer.
NTIS: PB 196 601 :12 pages
A method was developed for calibrating photographic emulsions and retrieving working curves for emission spectrography. The values obtained from a digital readout or a recorder chart of a comparator- microphotometer are converted to light intensity values using an emulsion characteristic curve derived from a quartic polynomial preliminary curve. The characteristic curve, consisting of seidel transform versus the logarithm of intensity, is split into two cubic polynomials at the zero value of the transform, resulting in eight emulsion calibration coefficients. These methods allow use of the calibration curves even at very small and very high intensities, thus extending the range of analysis. Use of a small computer allows rapid calculations. A computer program was written to formulate, code, and file each working curve along with its statistical error. Proper coding of the input data permits the direct printout of the concentration of the elements under investigation.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 196 601
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division