Cal. Factor ISO Calibration factor according to
DIN ISO 7503-1
Alarm Threshold: Alarm threshold for visual and audible
alarm in the same unit as above
Integral Threshold: Threshold for the integral value of the
measurement unit
Integral Unit: Unit of the integral value
Time Base: Used for calculating the integral, for
“s” the measurement value is added
linearly every second, for “min” each
measured value is first divided by 60
and then added, for “h” each meas-
ured value is first divided by 3600 and
then added (e.g. for µSv/h)
5.2 Measurement of Contaminations
Two types of measurement are available for surface contamina-
tion measurements:
1. Measurement of the net count rate in CPS (counts per sec-
ond).
2. Measurement of the net activities per area with the unit
Bq/cm²; the nuclide or nuclide mix to be measured has to be
set.
Both types of measurement can be selected in the Ratemeter,
the Search or the Counter-Timer measurement mode.
The measuring channel (, or and ) is selected on the
System menu under the menu item Display Mode
.
The nuclide
are set in the Measurement menu by repeatedly pressing the
Nuclides key. In the and mode, however, a new softkey
group appears with separate keys for the alpha and beta chan-
nel, which allows separate nuclide selection. You pass through
the nuclides selected from the nuclide table (small nuclide ta-
ble) and the measurement mode Gross and Net [cps] in cycli-
cal order. The selected nuclide is displayed in the top left corner
of the display. When passing through the small nuclide table
only the nuclides of the set measuring channel (type of radiation
or ) are displayed: So, if only the channel is set on the
Measurement menu, only nuclides are displayed when you
are going through the small nuclide table.
From the nuclide table you select those nuclides you need most
often (e.g. Net [cps], -tot, C-14, etc.).
By pressing the Nuclides button one can switch directly from
this preliminary selection during the measurement.
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