931040P / 1014
2. THE DETECTIVE-EX/DX-100
23
!
To return to the preceding dialog, tap Back. For example, tapping Back from the
Advanced Setup dialog (Fig. 17 on page 24) returns you to the Survey Mode screen
(Fig. 23).
!
On any entry, if you just tap Back without tapping any other keys, the current value will
be used; that is, no change will be made. Therefore, if you open a dialog by mistake, you
can just tap Back to return to the previous screen without changing any values.
!
If a text or number entry is needed, a soft keyboard will be displayed at the bottom of the
screen. Tap on the letters or numbers desired and then tap OK.
!
The Identification, Search, and Display screens have a Save button. In Identification
Mode, this saves the current energy histogram (spectrum) in memory and identification
results. In Search Mode, a histogram of counts vs time is saved. The storage location is
selected on the Spectra screen (Section 5.3.3.3). The Spectra screen also includes an Ask
for Sample Description option that allows you to enter a description of this data
acquisition.
2.10. Selecting the Data Storage Location and File Formats
This is discussed in Sections 5.3.3.3 and 5.3.3.4 (page 67).
2.11. Checking the Calibration
Once the Detective-EX is
Ready
, the next setup step is to check the calibration. This procedure
checks and adjusts the Detective-EX’s electronics so that it correctly identifies the nuclides in
the area. For an application as important as interdiction of illicit nuclear materials trafficking, it
is important to know that the nuclide identification is correct. Routine use of the recalibration
feature is a solid means of quality assurance, which can be used to support legal proceedings.
The Detective-EX is shipped pre-calibrated, but we strongly recommend the calibration be
checked before first use, then rechecked periodically. The digital electronics are extremely
stable, and in most situations are unlikely to need recalibration except at long intervals: days or
weeks. However, if wide ranges of ambient temperature variation are experienced (say, a change
of 20
E
C), we recommend checking the calibration more often.
NOTE
Before using the Calibrate feature, the calibration source must be selected on the Cal.
Settings dialog under the Advanced Settings. The Detective-EX allows you to select
from two predefined calibration sources,
137
Cs or
40
K; or define two of your own
sources. See Sections 5.2.1 and 5.1.3.
Summary of Contents for Detective-DX-100T
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