LESSON 8
ILLUMINATORS QUALITY CONTROL TEST
8-1.
PURPOSE
The illuminators quality control test determines the uniformity of the radiographic
illuminators that are used for viewing radiographs. Misdiagnosis could occur with poor
lighting, and that is why performing a quality control test on illuminators is an important
step in the quality assurance program.
8-2.
EQUIPMENT/MATERIAL
a. Radiographic illuminator measuring mask. This can be made from cardboard
or exposed radiographic film.
b. Photographic light meter (reads in candles).
c. Recording data forms.
8-3.
PROCEDURE
a. Remove the Plexiglas front of the illuminator and check for burned out bulbs
or bulbs with blackened ends.
b. Replace the bulbs with the same brand and type being removed.
c. Replace any bulbs that cause gross mismatch due to age or tone differences.
d. Clean the interior of the viewbox including bulbs and both sides of the
plexiglas. Use a screen cleaner.
e. Replace the Plexiglas front.
f. Turn on the illuminators at least 2 minutes before performing the test. During
these 2 minutes the lights of the illuminator should stabilize and give full brightness.
g. Place the mask on the illuminator (viewbox).
NOTE:
The mask has a series of positioning guides for the light meter.
h. Start with the first quadrant (upper left corner) and place the meter in contact
with the viewbox (see figure 8-1).
MD0062
8-2
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