ORTEC Micro-Detective-HX, Operation Manual

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ORTEC Micro-Detective
®
-HX Human Portable Radiation Detection System — Operation Manual
38
5.1. Home (Passive Monitoring) Screen
As set at the factory, the HX does not post IDs and
alarms on the Home screen. However, unmarking the
Suppress IDs option (page 30) allows you to use the
Home screen as a “passive monitor.” In this state, the
HX continuously acquires data and analyzes it for IDs
and alarms, but the monitoring activity is not being
recorded in data files. The data is gathered and pro-
cessed in 1-second slices. The HX analyzes a rolling
window of the most recent 8 slices and posts IDs
and alarms.
Figure 31 shows the Home screen registering high-
probability identifications of the Innocent radio-
nuclides Na-22 and Th-232. The presence of these
IDs in the real-time ID area means the HX is currently
detecting and identifying these materials. If you move
the HX until it can no longer detect the radiation source,
that ID will be removed from the screen. However, the
alarm posted at in the message area will persist until
acknowledged.
If more than three IDs occur simultaneously, the Home
screen instructs you to switch to Detect mode to see all
the materials detected, as shown in Fig. 32.
5.2. Detect (Survey) Screen
Figure 33 shows the Detect (Survey) screen, which is designed to help you locate and identify
radioactive material in a fixed area such as a cargo container. As discussed in Section 2.4, a
Survey is a single monitoring event, saved to disk, that can be of any duration and contain any
number of Long and Fixed Samples.
When you start a Survey, the HX begins collecting and analyzing the data that will be stored in
the ICD1/ICD2 file pair on the memory card. Section 2.4.1 describes in detail how all the com-
ponent spectra and analyses are collected and saved.
Fig. 31. Monitoring from the
Home Screen.
Fig. 32.