Performing nuclide identification
We are demonstrating the capabilities of the nuclide identification module on the sample spectrum of the 226Ra source, named RA37076A.
To start nuclide identification, open the measurement node of RA37076A, select the peak evaluation under it.
When you double-click on it, the peak evaluator tries to open it. However, it was already used in nonlinearity as well as efficiency analysis, and that made it read-only. This is why a warning message window appears now.
As we possibly want to refine the deconvolution results by the help of the nuclide identification, it is advantageous to skip the loading of that read-only peak evaluation, and create a clone of it, which can be freely modified.
To clone the peak evaluation, select it on the left, and click on the task Make a clone on the right pane. After a few seconds, a second peak evaluation appears under the measurement.
As the peak evaluations ordered from the newest to the oldest by default, select the upper one for processing (if you are in doubt, check the date of the last modification on the upper right pane).
Open it with the peak evaluator by a double-click.
After the peak evaluation loaded, please immediately go to the Messages panel, and check that if the efficiency analysis is loaded automatically for the measurement. This is indicated in the last a message line.
If this is not the case, please close the peak evaluator, and follow the steps of the section “Designating a proper efficiency curve as a default“ to create such an assignment.
Select Option / Nuclide identificationmenu now, to check current settings.
Under Radiation libraries tab, you can select which radiation libraries should be involved in the nuclide search. At the bottom, it is possible to select one from the user defined nuclide exception lists.
For a regular decay measurement, it is not needed to modify these default settings.
Under the second tab, Efficiency, click on the 'Automatic efficiency selection from meas. setup' item.
If you properly set up your efficiency curve – measurement setup assignment earlier, then the efficiency curve will be immediately displayed at the bottom, which is belonging to the loaded measurement.
Now click OK.
This efficiency setting will be retained for  next sessions, so the nuclide identification will be even more convenient next time.
Now the nuclide identification module loads the nuclear data necessary for the evaluation.
Please wait until the message disappears, then select Nuclide Ident. / Start identification menu.
Now the nuclide identification starts, which may last just a few seconds on a reasonable fast computer.
After the identification, the computed spectrum of the fitted nuclei will be displayed graphically.
As you walk through the fitted regions of the spectrum, you can see the result of the simulated spectrum.
The following display elements will be used:
This region contains 214Bi and 214Pb lines, and two lines were in a properly separated multiplet.
In this region, you can immediately observe the followings:
  • The energy calibration is well defined. This is imminent as peaks from the nuclide identification always placed at the location of the library energies, while the spectrum peaks are drawn at the fitted channel content, and there is a very good agreement in the peak centroid positions.
  • The efficiency calibration seems to be OK, as the intensities (amplitudes) of the nuclide id and the deconvoluted peaks are practically the same.
  • HyperLab's nuclide id is easily able to resolve multiplets originating from the same or from different nuclei.
Creating a nuclide identification report
Creating a report with all of the nuclide identification results requires no different action then in case of regular peak reporting: just select File / Create report menu, and the regular peak list report will also contain the results of the nuclide identification
 
 
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