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above) that flags the fact that the current ROI set has been altered but not yet been saved.
The small panel (“Drag cursor to”) immediately below this normally has “Zoom (normal)” checked. This means
that clicking and dragging on the spectrum will have the normal effect of zooming and un-zooming the display.
If “Set ROI” is checked instead, clicking and dragging in the spectrum will define an ROI. After setting an ROI
this way, the panel will revert to “Zoom (normal).”
Moving down and to the left is a small gray box displaying the current “ROI #” with “left” and “right” arrow
buttons. This box displays which specific ROI is being edited within the greater ROI set. Click the arrow buttons
to change the current ROI. The currently selected ROI is shown in fuchsia on the spectrum display. To create a
new specific ROI, advance the ROI number to one that contains no data. Up to 50 ROIs may be defined within
an ROI set.
Immediately below the “ROI #” is the “ROI Name” input box. Use this section to provide a descriptive name for
each individual ROI within the greater ROI set. This name becomes the one displayed in the spectrum status
bar, and is also used to identify individual ROIs in analysis reports.
Approximately in the middle of the ROI panel are two radio button controls, “Dbl Click to Set Starting Energy
(keV)” and “Dbl Click to Set Ending Energy (keV).” When the ROI Panel is visible, double clicking on the
spectrum will set either the lower or upper bound of an ROI (depending on which control is selected).
The controls immediately below provide a display of the lower and upper bounds of a specific ROI. Using the
buttons with the single arrow will advance the boundary of the specific ROI up or down one channel; the
buttons with the double arrow will advance the boundary up or down 10 channels. The energy associated with
this channel will be updated in the input box.
The “Kill ROI” button will completely delete the currently selected specific ROI, without giving any additional
warning. “Load ROI Set” opens a dialog box to select an ROI set. If the current ROI set has not been saved since
it was last altered, a warning will be displayed and you will be given an opportunity to save the current ROI set
before continuing. If the ROI set is not explicitly saved, all changes will be lost when a new ROI set is loaded.
