Table 6-18. Description of Film Artifacts

Table 6-18. Description of Film Artifacts - Continued - TM-1-1500-335-23_595

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 Table 6-18. Description of Film Artifacts Condition Cause Remedy 1. Pressure Marks White or dark areas as re- Handle film carefully, avoid bending sult of pressure on emul- when placing in cassette. Do not place sion. heavy objects on exposure holder. 2. Exposure to light Usually dark areas on film Light leaks in corners of exposure holders. of shadow pattern. Test film by developing without exposure to X-rays. 3. Static pattern Black, sharp chicken-track Handle film properly. type pattern. The result of rapid removal of film from paper cover of film box. 4. Paper pattern Mottled effect over complete Remove paper from film when exposing area on film. with screens. 5. Moisture on screen Spots on radiograph. Do not allow film to remain in lead screen exposure holders overnight in humid at- mosphere. 6. Mottle pattern Processing streaks. Use adequate short-stop and agitate film during processing. 7. Film reversal X-ray image reversed; light Extremely excessive exposure to radiation. areas dark, dark areas Reduce exposure. light. 8. Films stuck together Can be either dark or light Agitate film during processing to assure during processing depending on where in pro- solution penetrates emulsion. cess this occurred. 9. Water spots Result of splashing water Handle film in dry area of darkroom. on films after they are Completely remove from processing sec- dried. tion. Do not remove film from hangers until dry under clips. 10. Developer scum Surface on developer clings Mix solutions thoroughly before process- to surface of films in devel- ing films. oper. 11. Lead screen patterns Streaking on film due to al- Examine lead screens visually before use. loy segregation of lead. Change 3 6-87

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