PubMed · 6003376
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G R Engel, M R Howat. 1966. The glow modulator as a source for rectangular light flashes.. https://doi.org/10.1016/0042-6989(66)90055-1
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The present article describes the circumstances concerning the use of testing aids such as sensitometers with one-sided exposure. It is shown which phenomena must be considered if radiographic films coated on both sides are exposed with a) standard pocket sensitometers (one-sided exposure), b) lab sensitometers (double-sided exposure to ANSI Ph 2.9 [1964]), c) x-radiation in the cassette, intensifying screen and film system (to DIN 6867 T 1). The effect of the emission spectrum on the resulting contrast factor is described. The importance of different emulsion technologies (e.g. orthochromatic anticross-over films) for the contrast factor with one-sided exposure is described. The cross-over factor (c.o.), the apparent variation in sensitivity of the front and back emulsion with one-sided exposure, is the cause of the reduction in the contrast factor (G average) as against double-sided exposure: delta G(%) = c.o.2 x 10(3)/8.4
The authors suggest a device for automated exposure in micro-photographing with the use of the Elektronika B5-22 flash light. This pulsed light source is optimal as regards its spectral composition. The gist of the method is as follows: the flash photographic element, built in a light-proof case, disposed on the microscope ocular, permits governing the light pulse length.
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