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2. THE DETECTIVE-EX/DX-100
19
!
To avoid damaging the cooler (and, where applicable, to comply with transportation
regulations), be sure to turn the cooler off before shipping the Detective-EX (see
Section 2.8.2). The unit can be shipped as soon as the cooler is turned off; there is no
need to wait until the detector warms up.
!
For best results, we recommend that you not allow the instrument’s internal battery to
become exhausted, and that you read Section 2.6 on the Detective-EX’s internal and
external power sources.
!
When monitoring very high-activity sources (whether the source is an innocent or threat
nuclide),
if the detector Dead Time exceeds 70%, the detector cannot process gamma
radiation and generate IDs according to its performance specifications.
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 the instrument can perform as specified. See Fig. 15
(page 22) and its associated discussion.
!
When the most recent background reading is no longer valid, the
Background Invalid
message is displayed on the Survey Mode screen. The Identify and Monitor buttons
become inactive and the system will not post radionuclide IDs until a new background is
accepted (see Section 2.12). However, the gamma and neutron count-rate meters on the
Survey, Search, and SNM Mode screens continue to function normally, so the unit is still
passively monitors.
2.8. Startup and Cooldown
Before using the Detective-EX, you must:
!
Connect it to the power adapter/charger or other external power source. This will boot up
the computer, start the cooler, and start the
DetectiveEX
software application at the
Survey Mode screen.
!
Wait for the detector to cool down to operating temperature. Typically, this takes
<12 hours for the Detective-EX.
!
Depending on your power source options, charge the internal battery for 3–4 hours.
!
Check the detector calibration.
!
Set the data storage location.
Summary of Contents for Detective-DX-100T
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