931040P / 1014 5. ADVANCED SETUP
63
Figure 68. Search Time per
Horizontal Unit Selection.
5.2.5. Search Mode Settings
This dialog (Fig. 68) allows you to set the data Collec
tion Time for Search Mode. Search Mode tracks the
total counts vs a specified period of time and presents
the results in a “strip chart” emulation. The total counts
in each time period are represented on the vertical scale,
and the time period always occupies one pixel width
on the display (that is, changing the dwell time does
not change the width of the lines on the strip chart).
Tap to select a dwell setting. As soon as you choose a
new setting, it will go into effect.
5.2.6. SNM Mode Settings
Use this dialog (Fig. 69) to set the search acquisition
Dwell Time for the SNM Search Mode (Section 3.5);
and the detection threshold for Pu-239, U-235, and
Neutron radiation. Advanced users can also choose
to enable and configure a detection threshold for the
plutonium surrogate Ba-133 for training and site setup purposes (see the discussion in
Section 3.5). If the Ba-133 search is enabled, four bar graphs will appear on the SNM Search
Mode screen instead of just three (see Fig. 34 on page 39). The Dwell Time setting is the same
for all SNM radioisotopes.
To set the Q Alarm Threshold for each gamma emitter, tap the radioisotope name, tap in the
threshold field to open the soft keyboard, enter the desired value, and tap Set. Figure 69 shows
the setup dialog for Pu-239.
To set up the Neutron count rate (for units so equipped), in counts per second, tap the Neutron
tab, tap in the threshold field to open the soft keyboard, enter the desired value, and tap Set.
To enable the Ba-133 search (Fig. 70), mark the Include in Search checkbox and enter the
desired alarm threshold value, then tap Set. When this feature is disabled, the Ba-133 bar graph
is not displayed on the SNM Search Mode screen.
Tap Back to return to the Survey Mode screen.
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