Model 702i and 711i
Technical Manual
Section 7
Ludlum Measurements, Inc.
Page 7-8
December 2018
To collect data for identification, simply select the
Identify
soft key on the search mode screen.
The system will immediately begin to collect data for identification. An example is shown in Figure
13, with the industrial nuclide
137
Cs present. As soon as the system has identified the nuclide(s)
present, it will color in the peaks with their appropriate class color: blue for industrial (IND),
magenta for special nuclear materials (SNM), cyan for medical (MED), and green for naturally
occurring radioactive materials (NORM or NRM).
Do not be concerned if some parts of the display are marked in yellow – these are an indication that
the system is uncertain whether there is an actual signal or “peak” present in the spectrum. If you
wish to eliminate these uncertainties, you can extend the collection time by using the
+30 s
soft key
until the uncertainty has been resolved, but this is rarely necessary.
When there is a definite peak present but it does not match any nuclide on the current trigger list, it
will be labeled in red, for unknown (UNK). In this event, it may be valuable to re-analyze the data
with another trigger list, to see if the relevant nuclide was not enabled. If no analysis can be found,
it may be time to consider sending the spectrum to an outside facility for identification.
Figure 13 - Identify in Progress with
137
Cs
Once identification is completed, an analysis report will be presented, as described in the next
section.
Analysis Report
The analysis report gives the results of a detailed analysis of the collected data. An example of this is
shown in Figure 14. Different details of this report may be enabled for different applications.
