ORTEC
®
Detective-EX/DX
®
-100T Portable HPGe Spectrometer — User’s Manual
931040P / 1014
26
NOTE
This section discusses only the mandatory background measurement required to
complete the manual calibration. For the full discussion of Detective-EX background
measurements, see Section 5.2.2. As noted elsewhere, until you complete the
background measurement, the Identify and Monitor Modes will be disabled.
The minimum acceptable data collection time for the background meas is set on the Bkg
Settings screen (see Fig. 61 on page 60). Note that, for optimum counting statistics, we
recommend a minimum 30-minute background acquisition. However, the background settings
screen also allows minimum intervals of 1, 5, or 15 minutes.
!
All sources should be removed from the area before you tap the Run a Background but-
ton at the end of the manual calibration routine. If you leave the source in place, a “high
count rate” message will remind you to remove the source and restart the calibration.
!
Tapping the Run a Background button opens the screen shown in Fig. 22 and automati-
cally starts the background acquisition.
!
Acquisition continues until you tap either Save
or Cancel, which returns you to the Advanced
menu. If the measurement is canceled before
that minimum time has elapsed, the software
does not accept (i.e., save and use) the new back-
ground spectrum.
!
If necessary, you can obtain a valid background
later. See the instructions in Section 5.2.2.
Figure 22. Collect Background for
At Least the Specified Minimum
Time.
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