Abstract

The D vs log t curves of Eastman 103a–O uv-sensitized plates have been studied in the near ultraviolet and vacuum ultraviolet, respectively, together with the absorption and fluorescence spectrum of the sensitization lacquer. It was found that the contrast γt, obtained from the D vs log t curves calibrated in the vacuum spectrograph, was a constant within an experimental deviation of 4 percent throughout all observed wavelengths from 1320A to 360A and was equal to the contrast of the emulsion at the wavelength of maximum intensity of fluorescence of this lacquer. Numerous methods for the calibration of plates in air have been suggested and one of them was tested in detail. The reciprocity law of these uv-sensitized plates was studied and suggestions are made on the procedures leading to correct calibration curves of commercial plates for the purpose of photographic photometry in the vacuum ultraviolet.

© 1953 Optical Society of America

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References

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  1. G. R. Harrison and P. A. Leighton, J. Opt. Soc. Am. 20, 313 (1930).
    [Crossref]
  2. R. Tousey, Phys. Rev. 50, 1057 (1936).
    [Crossref]
  3. E. G. Schneider, J. Opt. Soc. Am. 30, 128 (1940).
    [Crossref]
  4. A. L. Schoen and A. L. Hodge, J. Opt. Soc. Am. 40, 23 (1950).
    [Crossref]
  5. Po Lee and G. L. Weissler, J. Opt. Soc. Am. 42, 80 (1952).
    [Crossref]
  6. F. S. Johnson and K. Watanabe, J. Opt. Soc. Am. 41, A292 (1951); Johnson, Wantanabe, and Tousey, J. Opt. Soc. Am. 41, 706 (1951).

1952 (1)

1951 (1)

F. S. Johnson and K. Watanabe, J. Opt. Soc. Am. 41, A292 (1951); Johnson, Wantanabe, and Tousey, J. Opt. Soc. Am. 41, 706 (1951).

1950 (1)

1940 (1)

1936 (1)

R. Tousey, Phys. Rev. 50, 1057 (1936).
[Crossref]

1930 (1)

Harrison, G. R.

Hodge, A. L.

Johnson, F. S.

F. S. Johnson and K. Watanabe, J. Opt. Soc. Am. 41, A292 (1951); Johnson, Wantanabe, and Tousey, J. Opt. Soc. Am. 41, 706 (1951).

Lee, Po

Leighton, P. A.

Schneider, E. G.

Schoen, A. L.

Tousey, R.

R. Tousey, Phys. Rev. 50, 1057 (1936).
[Crossref]

Watanabe, K.

F. S. Johnson and K. Watanabe, J. Opt. Soc. Am. 41, A292 (1951); Johnson, Wantanabe, and Tousey, J. Opt. Soc. Am. 41, 706 (1951).

Weissler, G. L.

J. Opt. Soc. Am. (5)

Phys. Rev. (1)

R. Tousey, Phys. Rev. 50, 1057 (1936).
[Crossref]

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Figures (2)

Fig. 1
Fig. 1

Some D vs log t curves obtained from two 103a-O uv-sensitized plates. The circles indicate the calibration in air with light of 3150A, the other curves were obtained from measurements with a vacuum spectrograph with λ of the light source lines as indicated.

Fig. 2
Fig. 2

The main graph on the bottom of the figure represents a plot of the reduced γt values (γλ/γ3150) vs λ from the near ultraviolet (crosses) through the vacuum ultraviolet (squares and triangles). The circle corresponds to the plate calibration in air at 3150A. Insert A shows the absorption spectrum of the fluorescent lacquer in arbitrary and nonlinear units, and insert B is a microphotometer trace of the fluorescent emission spectrum of the same lacquer. The lacquer thickness is about 10 microns.

Tables (1)

Tables Icon

Table I γt values vs wavelengths.

Equations (3)

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D = γ I log I + γ t log t - γ I log i ,
γ I = γ t / p .
γ = γ ( 1 - e - k t ) ,