T.O. 33B-1-1Table 6-18.Description of Film Artifacts - ContinuedCondition Cause Remedy12. Lead screen scratchesNormally appear as darkDiscard all lead screens having scratches.sharp lines on radiograph.13. Unclean screensWhite dots on film.Clean lead screens with steel wool andsoap periodically.14. Fuzzy imageCan be lack screen contactClamp exposure holder or cassette togeth-with film.er securely. Avoid using film holder invertical direction because of screen andfilm sag.15. Grainy imageCan be grain pattern ofCertain high temperatures are associatedsome high-temperature al-with grain pattern at voltage range of 150loys.to 250 kVp. This condition is eliminatedat higher voltages.16. Dichroic fogSurface of film is discoloredChange developer and short-stop sincewhen viewed by ref lectedthis condition is usually the result of ex-light.hausted solutions.17. Film scratchesEmulsion scratched by mis-Handle films on smooth surfaces at allhandling.times.18. Illuminator dirtSpots on illuminator appearWipe illuminators periodically with dampas dark areas on radio-cloth.graph.19. Surface conditionsCan appear as internal dis-Examine castings or welds for visible sur-continuities.face conditions before reading.20. Non-uniform light pat-Can appear as shadowedChange lamps to correct filament patterntern from illuminatorarea on film.and select f luorescent lamps to match inlight response.21. Unexplained pattern ofBack scatter pattern of cas-Back up cassette with lead blocking tohingessettes.prevent scatter from cassette or other sur-faces.22. Foggy filmsUse of film beyond expira-Protect films from radiation by lead-linedtion or inadvertent exposurefilm chest. Use film before expiration. Ifto radiation.questionable, check film by processingbefore exposure.6-88Change 3
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