Licence: Public Domain Mark
Credit: Military roentgenology / War Department. Source: Wellcome Collection.
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The practice of covering only one-half the film with the black paper is especially practical for the testing of light fog as compared with other factors which might produce fog. Light leakage can be considered blamable only if the uncovered portion of the film is fogged in contrast to the covered portion of the film; the latter showing no evidence or very little evidence of fogging. c. Roentgen ray proof features. The processing room must be protected against the ingress of X-radiation. To some extent, this can be accomplished by insisting upon certain arrangements of the X-ray machine in the exposure room. For instance, the X-ray table should not be positioned immediately adjacent to the inside wall of the processing room; auxiliary apparatus such as cassette changers, photoroentgen camera units and similar equipment should be positioned along an outside wall so that when using them, the primary beam of X-radiation will be directed toward an outside wall. Likewise, when accomplishing oblique projections, the patient should be positioned onto the X-ray table so that the primary beam will never be directed toward the wall of the processing room. In addition to such precautions, however, all walls of the processing room, serving to separate it from an exposure room, should be lined with ray-opaque material such as Jead or barium plaster. This must serve as protec- tion not only against secondary radiation but also against primary radiation escaping from the tube housing or such as might be concerned with an improperly directed primary beam. To provide such protection against radiation from a roentgenographic room, ordinarily, a wall lining of no Jess than 1.5-mm thickness of sheet lead or no less than 18-mm thick- ness of barium plaster is required. Such protection should extend from the floor level to the ceiling and at least 18 inches from the walls onto the ceiling or about any ducts or shelvings which may extend through the wall. For protection against X-radiation which might be concerned with an adjacent roent- genotherapy room, this protection may have to be tripled or quadrupled. The adequacy of protection against such leakages of roentgen radiation can be checked by exposed film testings comparable to those described in b above. The testings for X-radia- tion require several days exposure of the film. Moreover, rather than covering half of the film it should be covered entirely with black paper. A ray-opaque object, such as a key or penny, should be placed upon the film. If, after processing such a test film, there be found the image of the key or](https://iiif.wellcomecollection.org/image/b32174457_0103.jp2/full/800%2C/0/default.jpg)
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No text description is available for this image
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