T.O. 33B-1-1
6-34
because the cardboard will show on the radiograph. For lower kilovoltages, holders can be made from vinyl or Mylar
materials. A lead sheet can be taped to the back to reduce backscatter. Film holders can be taped in place or secured in
any way that will not affect the radiograph adversely. Cassettes give better film-to-screen contact and are often used
without a screen. Lead screens can be used with film holders but care must be taken to maintain even film-to-screen
contact. In any critical exposure the use of cassettes is recommended.
6.4.2.6
Labeling Of Film Holders.
Do not at any time write information using a ballpoint pen or other sharply pointed writing instrument on the surface of
any cassette or film holder. Film artifacts will be produced which will affect radiographic interpretation. If
identification is required use self-adhering labels on which the necessary information is recorded before applying to the
cassette.
6.4.2.7
Bending or Kinking of Film Holders.
Do not bend or kink the film holders unless absolutely necessary for placement of film for exposures. Artifacts may be
produced which could impair interpretation of the radiograph. Use smaller or custom shaped film for better fit to part
if required.
6.4.2.8
Preparation of Film Holders.
a. Remove other materials from the workspace.
b. Before loading the film holder open it and examine for cleanliness and light leaks. Discard any film
holders that are physically damaged beyond repair. Many light leaks may be repaired with black
photographic tape. Remove any lint or dust with a clean cloth. Do not blow the dust out since moisture
may lodge on the holder and be transferred to the film
c. Place the film selected and film holder in a convenient location in the darkroom. If screens are used,
place them in a handy spot to simplify loading of the film holder.
d. If a screen is used, place it in the film holder face upwards so it will contact the film.
6.4.2.9
Loading Of Film Holder.
NOTE
Do not allow the film to slide into the holder pocket. Scratches from the holder,
screen or paper may result.
The procedure that follows covers only one type of film holder. Different film holders vary in the method of locking
and opening but the same procedure will apply except for these details.
a. Open the inner folded cover all the way.
b. Withdraw the film from the film box with paper cover in place. Handle the film only at the edges with
light finger pressure.
c. Grasp one side of the paper cover to open it. Place the film so the free end is against the rear edge of
the holder. Lower the film slowly and allow the film to fall gently into the holder and remove the
paper.
d. Refold the inner paper cover.
