T.O. 33B-1-1
Table 6-18.
Description of Film Artifacts - Continued
Condition
Cause
Remedy
12. Lead screen scratches
Normally appear as dark
Discard all lead screens having scratches.
sharp lines on radiograph.
13. Unclean screens
White dots on film.
Clean lead screens with steel wool and
soap periodically.
14. Fuzzy image
Can be lack screen contact
Clamp exposure holder or cassette togeth-
with film.
er securely. Avoid using film holder in
vertical direction because of screen and
film sag.
15. Grainy image
Can be grain pattern of
Certain high temperatures are associated
some high-temperature al-
with grain pattern at voltage range of 150
loys.
to 250 kVp. This condition is eliminated
at higher voltages.
16. Dichroic fog
Surface of film is discolored
Change developer and short-stop since
when viewed by ref lected
this condition is usually the result of ex-
light.
hausted solutions.
17. Film scratches
Emulsion scratched by mis-
Handle films on smooth surfaces at all
handling.
times.
18. Illuminator dirt
Spots on illuminator appear
Wipe illuminators periodically with damp
as dark areas on radio-
cloth.
graph.
19. Surface conditions
Can appear as internal dis-
Examine castings or welds for visible sur-
continuities.
face conditions before reading.
20. Non-uniform light pat-
Can appear as shadowed
Change lamps to correct filament pattern
tern from illuminator
area on film.
and select f luorescent lamps to match in
light response.
21. Unexplained pattern of
Back scatter pattern of cas-
Back up cassette with lead blocking to
hinges
settes.
prevent scatter from cassette or other sur-
faces.
22. Foggy films
Use of film beyond expira-
Protect films from radiation by lead-lined
tion or inadvertent exposure
film chest. Use film before expiration. If
to radiation.
questionable, check film by processing
before exposure.
6-88
Change 3
