Abstract

X-ray exposures are supposed to result in the production of a considerable amount of internal latent image. However, in a motion-picture positive emulsion hardly any internal latent image could be developed after exposure to x-rays, at the temperature of liquid nitrogen as well as at room temperature. Since the existence of a marked Herschel effect shows that a considerable number of grains carry not more than one surface center, and that of minimum size, the question arises as to where the many hundred silver atoms have gone which were produced in the grain by the absorption of one x-ray quantum. They could have disappeared by rebromination in the absence of a halogen acceptor, or they could be too finely distributed to act as development centers. A reversal of the Herschel effect at high densities, after an x-ray exposure at the temperature of liquid nitrogen, argues for the second assumption.

© 1949 Optical Society of America

The Herschel Effect and the Structure and Stability of the Photographic Latent Image*

G. Kornfeld
J. Opt. Soc. Am. 39(6) 490-494 (1949)

The Photographic Action of X-Rays in the 1.3 to 0.01A Range*

Herman Hoerlin
J. Opt. Soc. Am. 39(11) 891-897 (1949)

An Experimental Study of Latent-Image Formation by Means of Interrupted and Herschel Exposures at Low TemperatureMeasurements of Reciprocity Law Failure at Low Temperature*

J. H. Webb and C. H. Evans
J. Opt. Soc. Am. 28(7) 249-263 (1938)

The Distribution of the Latent Image in the Silver Bromide Grain*

G. Kornfeld
J. Opt. Soc. Am. 31(9) 598-601 (1941)

Mercury Sensitization and the Optical and X-Ray Latent Images

Albert May
J. Opt. Soc. Am. 32(4) 219-223 (1942)