SAIC Exploranium – GR-135 System Manual page: 63
The main display shows the selected spectrum in LINEAR mode. You can use the “Scale”
button to select LOG if required. The following information is shown:
• The GREEN lines show the peaks that have been identified by the spectral analysis engine
and the “Isotopes Identified” data box names these isotopes.
• The BLUE lines show peaks found but too small to use for accurate analysis.
• The RED lines show peaks that are over the signal to noise threshold but relate to isotopes
that could not be found.
• The dotted vertical PURPLE is the cursor. The mouse can be used to drag this cursor
(position, left-click and hold then drag)
• From the current library (in the upper right corner) you can click on any line and the required
lines for that isotope will appear on the spectral display. This allows you to quickly scan
through the library and compare selected isotopes to the displayed peaks for a more in depth
analysis.
• Any lines that find peaks that match the selection show as GREEN. If there is no match then
they show as RED.
Using isotope libraries and CZT data
The isotope library file that is used to upload to the GR-135 is the same as the one that can be
loaded for analysis. The data will be re-analyzed with the new isotope library. The registry will
remember the last library selected and will always use that library.
CZT data is shown in the same manner. In the event that CZT spectra have been collected the
software recognizes this and changes the labels at the middle-right to define which detector the
spectrum represents.
As explained earlier in the manual, if the system triggers an automatic analysis using the CZT
detector, then the previous recorded spectrum is the NaI spectrum. If, for example, there are 4
spectra in memory then a new NaI spectrum would be #5. However, if the CZT is triggered then
the final display will show “Recorded as spectrum #6”. This means that the CZT spectrum is #6
and therefore its corresponding NaI spectrum is #5.
On the graphic display shown it is very easy to see the differences in these data as the NaI
spectra is very large in amplitude compared to the CZT spectra.
Focusing on portions of the spectra
You can focus on certain portions of the spectra by using the Graph Pallette:
1. Turn off Auto-scaling by clicking the Scale menu and deselecting X Auto Scale and Y Auto Scale.
2. If you don’t see the Graph Pallette, right-click anywhere on the graph, select Visible Items, and
select Graph Pallette from the sub menu. The toolbar appears.
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