Chapter 5 Parameters Definition
104
In addition the “,” (comma) character cannot be used in these fields since it
would affect the number of columns when imported into a spreadsheet or
database (Monitor ID, Location ID, and Serial Number are combined and
placed in the first column of all Datalog CSV files).
Count Rate Units: The monitor reports gross and net count rates in units of either
cps or cpm on the various screens and printouts. Only cps is used internally,
however, either cps or cpm can be used for display. Toggle to the preferred choice.
Activity Units: The choices of activity units for the various screens and printouts are
dpm, Bq, nCi, pCi, µCi, dpm/cm², Bq/cm², nCi/cm², pCi/cm² and µCi/cm² . Only Bq
is used internally, however any of the choices can be used for display. Thus, a
calibration source’s strength could be entered in nCi in the Activity line in the
F9 – Edit Calibration Source List screen (on page 137). One could then return to
Activity Units and select “dpm”; no conversion would have to be performed by the
user when setting the Alarm Activity (release set point) to a value in dpm in the
F2 – (Zone) Settings screen on page 116. The software takes care of the conversion.
The Calibration Source dimensions (entered in F9 – Edit Calibration Source List
screen (on page 137) and Alarm Test Source dimensions (when Activity Units are set
to a per unit area activity) are entered in the F2 – (Zone) Settings screen on page 116
are used to convert between Bq/cm² and Bq, etc.
High Contamination Alarm: This feature changes a “Contaminated” event to a
“High Contamination” event if the net count rate for any zone is above a High Count
Rate. Setting choices are “Disable” (default) or “Enabled (High Alarm Activity)”.
If set to “Enabled (High Alarm Activity)” then “High Contamination” values are
flagged with an asterisk (*) to distinguish them from “Contamination” values.
See F3 – Setup, F3 – Detection Zones, F2 – Settings, High Alarm Activity [] Bq
setting (if “Enabled”).
The High Contamination Alarm will override any Sum Zone Ratio and/or Radon
Rejection filters.
Extend Count If Contaminated: Choices are “No” (default) and “Yes”. This option
allows for an extended count time when potential contamination is detected, that is
when the net count rate is above the Alarm Trip Point (ATP) but below the definitely
Contaminated Trip Point (CTP). The additional counting time improves the
monitoring statistics. Note that if any detection zone registers definitely contaminated
(above the CTP) then the unit alarms immediately. The duration of the extended
collection time is specified in the Wait Timeouts screen (F2 - Wait Timeouts on page
106) and has a default value of 10 s. While extending the count time the unit plays
the EXTEND.WAV audio file. Refer to Alarm trip Points on page 286 for a full
description.
The number of times an extended count was performed is recorded in the Monitor
History file. See Monitor History screen on page 236.
This item defaults to “NO” while operating in “Walk-Through” mode.
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