Chapter 5 Web-Based Operations
80 Lynx II DSA User's Manual - 7096089
When the cursor is within a region of interest, the following additional items are displayed.
• Left/Right marker – Displays the start and end position of a region when the
cursor is in a region.
• Centroid – Displays the computed region’s centroid value in both channel and
energy units.
• Area/cps – The net area of the peak without the continuum or the gross area under
the peak with continuum.
• Integral/cps – Displays the sum of all counts/cps within the region of interest.
• FWHM – Displays the full-width half-maximum in energy units.
• FWTM – Displays the full-width tenth maximum in energy units.
• Gaussian Ratio is the ratio of the FWTM to (1.8226 x FWHM) where the FWTM
and the FWHM are determined from the unfitted peak algorithm.
Creating ROIs
To add an ROI, press the left mouse button down and drag the cursor. The spectrum will
highlight the region. Release the left button and the region is added.
Note:
You must have the Lynx II “locked” to access the ROI functions.
You can edit the ROI by selecting Adjust ROI option from Spectral Plot Context Menu. A
dialog appears with the following options. Click on X to close the dialog box.
• Left – The channel or energy value for the left position. The units are based on the
x-axis display units.
• Right – The channel or energy value for the right position. The units are based on
the x-axis display units.
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