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Biodex Medical Systems, Inc. © 2016 189
7. Glossary
This glossary provides definitions for the most common terms relevant to the Atomlab Dose
Calibrators.
Accuracy Tests
The test of a dose calibrator to see how close the displayed activity values are to the true values.
Averaging Period
The time the Atomlab takes to display a stable activity reading.
Background Correction
The function of the Atomlab, initiated by pressing the <BKGND> key, which stores a value for the
ambient activity. This value is automatically subtracted from all subsequent activity
measurements to compensate for the background activity level.
Becquerel (Bq)
The international unit of activity, corresponding to one dps (disintegration per second, or one
nucleus decaying per second). The Atomlab displays activity values in units of MBq (million Bq)
or GBq (billion Bq).
Calibration
The use of calibrated activity sources traceable to the National Institute Of Standards &
Technology to calibrate each Atomlab unit and verify the accuracy of the activity values it
displays.
Calibration Value
The value set on the dial value display to adjust the Atomlab to correctly respond to a
particular radioisotope. See Response, Ionization Chamber.
Calicheck
A sleeve shield package to perform linearity tests on dose calibrators.
Chamber Bias
The high voltage applied to the chamber which causes ions in the argon gas to move to the
collector electrode.
Constancy Check
Performing daily checks using a radioisotope with a long half-life to ensure that the activity
values a dose calibrator displays is stable over a long period of time.
Decay Chart
A chart projecting how the activity of a source will decay over a period of time at specified time
intervals.
Detector Unit
An Atomlab component housing the ionization chamber detector and the electrometer.
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