6 Maintenance
FOCUS 29
6.4 Radiation dose measurement
If the user wants to periodically measure and follow the
radiation dose consistency, it can be measured in the
following way.
Use test object (6mm thick aluminum sheet, or other object
with filtration equivalent to 6mm Al) to represent a normal
patient, place a radiation detector (not supplied with the
unit) on the test object and position the cone of the unit on
the radiation detector.
Recommended technique factors for conducting this test
are: 70 kV, 0.2s exposure time.
Expected dose using this method is found in DOSE AREA
PRODUCT table in chapter 7. The measured dose
depends on the cone used, variations between units,
radiation detector accuracy, etc.
NOTICE! Measured dose is an estimate of patient
entrance dose.
Increasing technique factor values (kV, s) increases the
exposure dose.
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