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A powerful method to define ROIs is by using nuclide emission data. The bMCA application incorporates this
method as shown below:
Figure 23 – Creating ROIs from nuclide emissions library file.
By clicking on the “Open library” button you can load the nuclide emissions that were previously stored into a
nuclide library file. The radiation emissions are then listed in this dialog for your choice.
An effective way of visualizing the emission boundaries directly in the current spectrum is built-in into the
application. Using the “Preview” check box causes the energy emissions that are currently selected (with a
check mark) to be shown in the current spectrum. The FWHM factor can be varied in order to make the
expected ROI from those emissions wider or narrower, to compensate for different types of scintillator
detectors. The ROI width is set as Factor x FWHM, where FWHM is the expected theoretical FWHM and Factor
is the coefficient entered in the corresponding field. The following figure illustrates how this useful ROI addition
process works.
Figure 24 – Adding ROIs from a nuclide library. The emissions corresponding to nuclides Cs137 and Am241 are selected and the
“Preview” option chosen with 2 x FWHMs. The expected ROIs are shown in grey color on the existing energy spectrum. The previewed
ROIs are properly labeled as well.
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