LB 124 Scint 5. Contamination Measurements
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5.1.2 Measuring and Storing the Background
The background, i.e. the ambient radiation, is measured in
CPS. It is automatically subtracted in the course of the sample
measurements. The gross and raw data values can be dis-
played simultaneously.
Procedure
On the System Menu, choose the option Background. The
background parameters and the start option are displayed.
Figure 11: Background menu
Set the desired parameters for the background measure-
ment.
α-background Shows the currently stored α-
background value. It can be the
result of a background measurement or
can be entered manually. It can be the
result of a background measurement or
can be entered manually. The stored
background is subtracted during each
measurement.
βγ-background: Shows the currently stored background.
It can be the result of a background
measurement or can be entered manu-
ally. The stored background is sub-
tracted during each measurement.
Preset Time: Enter the desired measurement time.
To receive accurate results, you should
enter an interval of at least 60 seconds
Precision: Enter the desired precision for the α
and the βγ measurement channel.
Threshold: Enter the desired threshold which,
when exceeded, triggers an alarm (ap-
plies to both measurement channels).
Autostart: When ON is set, with every start-up of
the device, first of all a background
measurement will be executed auto-
matically.
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