HF Series Generators
Maintenance
MA-1004R4
16
4. Select 110 kV. Make an exposure without film in the cassette and check
that the Exposure Time is higher than 20 ms. If necessary for that, change
the Copper thickness (or if needed change the mA station) and make the
exposure again. Take note of the final Copper thickness and mA station
selected for 110 kV.
5. Insert a cassette with the Medium Film/Screen combination used by the
customer. Make an exposure at 55 kV and 90 kV (use the final Copper
thickness and the selected mA station noted before for each kV), develop
the film and measure the Optical Density obtained with those exposures.
Check that the film variation range is the same ±0.2 of the Optical
Density (or ±20% of Image Gray Level / Dose Level with CR or DR)
obtained before at 70 kV (Optical Density Adjustment -- Section 2.9.1).
6. If the variation values is not as required, perform the respective AEC
Calibration procedure.
7. Repeat the above steps for all the Ion Chambers installed with the
Generator.
2.9.3 ATS DIGITAL AEC (RAD) (OPTIONAL)
If the Generator is interfaced with an “ATS Digital System”, Digital
AEC test has to be performed as explained in the “ ATS Digital
System” documentation.
Note .
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