11
This release of the Detective-EX software does not use the Live Time and Real Time fields.
47
Figure 38. Advanced Setup, First
Page.
5. ADVANCED SETUP
The three-page Advanced Setup menu covers tasks
that are not typically required every work session and
that require some knowledge of gamma-ray spectro-
metry and/or radiation monitoring. The Detective saves
all settings and uses them until the next time they are
changed. Figure 38 shows the first page.
!
Tapping the Next>> and Previous<< buttons
moves you between the three menu screens.
!
Tapping Back returns you to the Survey Mode
screen.
NOTE
You can set a password on the Settings screen
(Section 5.2.4.1) to restrict access to the second
and third pages of the Advanced Setup menu.
The first Advanced Setup page can be accessed
by all users, allowing them to view the hardware
status, perform calibrations and background
measurements, turn the cooler on/off, etc., as described in the following section.
5.1. Advanced Setup — Page 1
5.1.1. Status
The Status dialog (Fig. 39) allows you to monitor the hardware diagnostic and data acquisition
parameters. The default view is a simplified “heads-up” OK/ERR readout. However, you can
toggle between the simplified view and the actual readouts (Fig. 40) by tapping three times in
the lower-left corner of the screen.
!
The Dead Time is related to the current gamma count rate, and indicates the percentage
of time the Detector is busy (i.e., not available to accept another pulse).
11
NOTE
When the Dead Time exceeds 70% because you are near a very high-activity
source (whether the source is an innocent or threat nuclide), the detector is not
able to process gamma radiation according to its performance requirements.
A red indicator in the upper right corner of the screen tells you to MOVE
BACK from the source until the dead time drops below 70% so that the
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