APX 525/625 Generator Revision C Service Adjustments
©
2005 Del Medical Imaging Corporation
7/5/2005 Page 155
• Densitometer capable of measuring optical film densities from .5 to 2.5
+/- .05
• X-Ray film processor
• Film and cassettes
• Phantom - 10 pieces of 1" x 8" x 8" (2.54 cm x 20.32 cm x 20.32 cm)
pieces acrylic OR flat bottom (no reinforcing bumps) plastic bucket to
hold 12 inches (30.5 cm) of water
• Voltmeter
• Small screwdriver
• Calibrated oscilloscope - DC to 1 MHz response - storage scope
desirable
Warning: certain tests require the production of x-rays. Field personnel should take
precautions to ensure their personal safety and the safety of others in close proximity.
Minimum precautions are as follows:
a. Wear lead aprons
b. Personnel in the X-ray room during exposure should be behind a lead
shield
c. Minimize radiation scatter through doorways, walls and floor
Calibration Procedure
1. Set up x-ray system in the manner in which normal examinations will occur (40”
S.I.D.)
2. Make sure film is loaded in the cassette. Six inches of acrylic phantom should be
placed in the field, with the collimated x-ray field confined within the area of the
phantom
3. Set the generator to the following technique:
- Large focal spot
- Table or wall image receptor
- AEC ON
4. The AEC is pre-calibrated at the factory to match typical film/screen
combinations of both 200 speed (Screen 1) and 400 speed (Screen 2). The
settings are based upon a 40 SID and an 8:1, 103 line grid. This calibration
procedure fine tunes the AEC to the individual installation parameters. The
following procedure would be similar for other speed systems
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