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The Elimination of Afterglow and Latent Phosphorescence from Fluorazure (Zinc Sulphide) Intensifying Screens: Part II—Physical Investigation

This excerpt was created in the absence of an abstract.

The Ilford "SX" screens were withdrawn, as has been stated, owing to their producing, after heavy exposures, double images consisting of the image of the wanted subject, and superposed on it fainter images from one or more previous heavy exposures. It also became apparent that afterglow resulting from exposures to white light, was of practical importance, and upon occasion sufficient to produce fogging of X-ray film some hours after the screens had been exposed.

These experiences were somewhat surprising, as we had shown that no afterglow image was obtained when a film was placed in contact with a pair of "SX" screens a short time after they had received an exposure to X rays many times as great as the heaviest required for human radiography.

It was soon found, however, that the production of images of previous exposures could occur in a variety of ways, of which afterglow is but one. In this paper we wish to bring to your notice two phenomena, which we have termed latent fluorescence and latent afterglow respectively, which we believe are being described for the first time.

We can divide the phenomenon of multiple image formation into four types—(1) Images due to afterglow from exposure of the screen to white light and (2) images due to afterglow from X-ray exposure, both of which phenomena were previously known; (3) latent fluorescence; (4) latent afterglow.

Received for publication January 27, 1934.