Chapter 5 Parameters Definition
122
There is an individual calibration screen for each zone, including singles, pairs,
triples, etc. The title shows the zone use (foot, body, head etc.) as well as, in the case
of sum zones, the detector sections that make up the zone currently selected. Its
location is indicated on the inset layout diagram by hatch marking. The number in
small font at the top right of the screen gives the sequential number assigned to the
zone that is used on various information screens and printouts.
Use Ctrl+Home, Home, PgDn, PgUp, End, or Ctrl+End to select the first, first in
the group, next, previous, last in the group, or last zone, respectively. Pressing Home
or End repeatedly advances quickly through singles, pairs, etc.
The default (derived) efficiency for a sum zone is calculated by multiplying the
efficiency of the sections (or detectors for monitors that have one section per
detector) that make up the zone by a factor to correct for the dead area between the
sections. This correction is based on a point reference source held 5 cm from the
detectors. The efficiency used for sum zones can be reviewed and updated on this
screen. This information is included in the printout discussed in F5 – Contamination
Check Results Printout on page 259.
Zone Settings setup screens have a dark green background for Gamma values. Only
zones that have the displayed channel are shown.
Active Keys
F1 = Do Calibration Collection: Make certain the correct calibration source is
selected (see below). Place that calibration source in front of the zone and press F1.
A calibration collection occurs for the Calibration Collection Time specified in the
Calibration Settings screen. At the completion of the collection, the efficiency is
calculated. The ten calibration-related line items beginning with “Calibration” are
updated and the text for the Calibration line item changes to “Calibrated” plus the
Date and Time.
The current setting for Alarm Calibration Type on the Common Values screen
determines whether the Calibration Source Emission Rate or Activity value will be
used in the calibration calculations. The relevant number is shown in white text and
the other value is shown is grey.
Note: The F1 key is disabled and a calibration collection cannot be performed if no
Calibration Source is selected or if the Calibration Source Emission Rate or
Activity, as applicable for the currently selected Alarm Calibration Type, is
zero. In addition, detectors (or zones) in Conditional Service will have the
F1 = Do Calibration Collection hidden and replaced by the words
Conditional Service since the High Voltage cannot be enabled for these
detectors.
Refer to Calibration Requirements for Contamination Monitors on page 88 for a
more complete description of the calibration procedure.
Shift+F1 = Auto Calibration Collection:
• Enabled when all detector zones have valid calibration source specified and
zone shown is a detector zone.
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