ORTEC Micro-Detective-HX, Operation Manual

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2. SYSTEM OVERVIEW
13
!
MOVE BACK — When the HPGe detector dead time exceeds 70% because you are near a
very high-activity source (whether the source is an innocent or threat nuclide), a
MOVE BACK
message is displayed. See Fig. 13. In this state, the detector is not able to process gamma
radiation and generate alarms according to its performance requirements. You must move
away from the source until this message is no longer displayed in order for the HX to
perform as specified.
2.6. Data Storage and Management
The current background file is stored as an ORTEC
.CHN
-format spectrum file in the computer’s
\Program Files\HPRDS
folder.
The data from each survey is saved as a pair of
.ICD1
and
.ICD2
files that share the same base
filename.
!
The
.ICD1
file contains the survey spectrum data and a copy of the background spectrum in
effect when the Survey was performed (see also Section 2.4.1).
!
The
.ICD2
file contains the analysis of the survey data.
The
.ICD1
/
.ICD2
file pairs are stored on the provided memory card in the
\Data
folder.
As the card approaches its storage limit, the HX notifies you and prevents further surveying or
sampling. If a survey is in progress, the HX notifies you and ends the survey. You can either use
the Clear Data command (Section A.4) to permanently delete the
.ICD1
/
.ICD2
file pairs from the
memory card and reuse it, or you can substitute another memory card of up to 2 GB capacity.
IMPORTANT
Do not manually delete the survey files; doing so may disrupt the HX software.
Note also that you can only safely remove or change the memory card from the
Home screen. Removing it during a survey immediately terminates the survey
without saving the data. It also generates an amber “system error” that requires
extra steps to clear (see Section 8.7). In rare cases, it can cause the HX program
to stop operating (see Section 8.1).
For information on transferring files from the HX to a host PC, see Chapter 7.