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130 ATOMLAB 500 DOSE CALIBRATOR
Daily Constancy Test
(See Figure 6.2.)
Figure 6.2. The Daily Constancy Test screen.
This test allows the user to put a calibrated sealed isotope into the detector and check to make
sure the system is correctly reading the activity. each detector must be checked individually.
The Atomlab 500 allows entry of the sealed sources into inventory and decay-corrects these
sources for time. These sources are used for the testing of the dose calibrator chambers.
Constancy means reproducibility in measuring the same source, over a period of time, with
decay correction. Assay a relatively long-lived source (such as Cs-137) each day before using the
calibrator.
Cs-137, 200 µCi, is strongly recommended because the 30-year half-life will assure use of the
same source throughout the life of the calibrator, and the Cs-137 source is readily available. The
Cs-137 source should be replaced at 100 µCi.
NOTE: You can only perform one Daily Constancy Test or Expanded Constancy Test for a
specific sealed source per day.
To Perform A Daily Constancy Test:
1. From the QA Dose Calibrator screen touch <Daily Constancy Test>. The Daily Constancy Test
screen is now displayed. The source information is shown.
2. If only one detector is connected, skip to step 3. If more than one detector is connected,
touch <Select Detector> and select the detector you want to test.
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