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Colored Areas in the Spectra
Yellow Peaks (UNC)
Red Peaks (UNK)
Thermo Scientific
Figure 40: Screen ID of isotopes – Ba-133, Co-57, Co-60, and Mn-54
Figure 40
shows an example of a multiple isotope spectral acquisition, including Ba-
133, Co-57, Co-60 and Mn-54. As soon as the system has identified the nuclides
present, it colors the peaks with their appropriate class color (see also
Classes
on
page
11).
In this example, peaks identified as Ba-133, Co-60, and Mn-54 are colored blue
(IND=industrial) and labeled with the name of the nuclide found. There is one peak
colored gray that was originated by backscatter effects of Mn-54; it is labeled Mn-
54. In addition, there is one light blue peak for Co-57 (MED = Medical). Lastly, there
is one remaining peak colored yellow for UNC (uncertain).
Do not be concerned if some parts of the display are marked in yellow – this is 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.
The value in RIIDEye's real time spectra build is the ability to customize the scan time
to each scenario to which RIIDEye is exposed. One way to monitor the spectrum
acquisition is to watch for the presence of yellow UNC peaks. Depending on the
source, location, and background, the yellow peaks can be resolved by adding
between 30 and 120 seconds. When paired with SNM Assist (see
8), you can be highly confident in the accuracy of the results.
If there is a definite peak that does not match any nuclide on the current trigger list,
it will be labeled in red for unknown (UNK). If this occurs, you may achieve more
conclusive results by re-analyzing the data with a different trigger list to see if can
match the relevant nuclide (see
To reanalyze with another trigger list, simply change the trigger list in the green Field
Settings menu. Once the trigger list has been changed, review the spectra using the
Spectral Data menu. The results of the scan will automatically be reanalyzed with
12/22/2016
Trigger list
on
page
34).
RIIDEye DB-099E Operator Manual
3
Nuclide
SNM Assist
on
page
36
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