On the left, the components listed which has been included in the final activity fit. On the right, there is the list of all possible components (those where at least some of the gamma lines are found in the spectrum).
At the left side, there are two main groups under the Determinables (components which has meaningful lines): the Single components, where the activity of a decay could be determined could be determined on its own; and the Component groups at the bottom of the list, where the tightly coupled, highly correlated components can be found.
Node of each component can be opened by a double click on its name, and all the searched radiations are listed under it. If a library gamma found in the spectrum, it is designated by a colorful gamma photon sign. If no spectrum peak was found at its place, a pale icon is drawn, and the “Bkg” prefix is used. In this latter case, the amount of missing counts is also displayed which would be required at the point of the missing peak, but not found.
Regardless of the status of the radiation node, double-clicking it opens the Spectrum tab, and jumps to the position of the clicked line.
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When a slight difference can be observed in the position of the virtual peaks (displayed by the nuclide identification module) and the measured peaks, probably there is a small energy calibration problem.
Update your calibration, by adding this peak to the energy calibration points, and check if the nonlinearity part of the calibration is in effect.
There is a small chance, too, that the nuclear data is not perfect, but this is rarely the case.
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Due to statistical nature of the measured counts, the spectrum peak deconvolution algorithm sometimes misses a peak. In several cases, those peaks are pointed out by the nuclide identification algorithm, as it utilizes the information from all peaks of the nuclide.
The picture shows the case when a small 214Bi peak is missed by spectrum analysis, but the nuclide identification found it.
Insert the missing peak manually to the region, and re-run nuclide identification.
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In some very rare cases, the nuclear libraries are not perfect: may contains errors for the energy positions or the intensities of library peaks.
One such example can be seen on this figure. As we see that while intensities and the positions of other 214Bi peaks are properly matching the measured peaks, there is a true outlier at 1416keV. This is probably comes from an intensity problem in the original nuclear data.
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