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Photographic Calibrations for Emission Spectrography Using a Small Computer.

Authors
Heemstra-RJ
Source
NTIS: PB 196 601 :12 pages
Link
NIOSHTIC No.
10009193
Abstract
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.
Publication Date
19700101
Document Type
IH; Report of Investigations
Fiscal Year
1970
NTIS Accession No.
PB-196601
NTIS Price
A03
Identifying No.
RI 7447
NIOSH Division
BERC;
Source Name
NTIS: PB 196 601
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