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Enter the activity of the specific isotope in the “Activity” input box. This must be performed for all ROIs within
the ROI set prior to performing an efficiency calibration. Use the “Units” dropdown list to assign units to the
activity. Note: The activity units must be the same for all activities entered. Changing the units for one specific
ROI will change the units assigned to all other ROIs within the ROI set.
The “ROI Eff. Cal!” button performs an efficiency calibration by applying the data entered on the Efficiency
Calibration
Panel against the currently displayed spectrum. If no data is contained in the spectrum, or if all the fields are
not filled in, rated and the efficiency calibration will be aborted.
The “Cancel” button will make any alterations made on the Efficiency Calibration Panel revert back to the ones
used in the most recent efficiency calibration.
Every time an efficiency calibration is performed, a report is generated and stored in the URSA-II Cal Files
directory.
This report can be viewed, printed, or saved by clicking the “Report…” button. Note: The contents of the report
and use of the report window are discussed in detail in other portions of this manual.
Peak-Based
This displays the Peak-Based Panel for performing peak searches, and for performing isotopic identification and
peakbased quantitative analysis.
Clicking the “Find Peaks” button causes URSA-II MCA to search the currently displayed spectrum for dentifiable
peaks.
These will be displayed on the spectrum in green, with a line indicating the peak centroid. The collection of
found peaks acts a bit like a temporary ROI set, and the currently selected peak (which will be the leftmost one
immediately following a peak search) will be displayed in fuchsia.
Clicking the “Report…” button makes URSA-II MCA perform a qualitative analysis. If an efficiency calibration
has been performed, a quantitative analysis will also be preformed. This will then be displayed on a “report”
screen, where it can be viewed, printed, or saved. Note: The contents of this report and use of the report
screen are discussed in detail in other portions of this manual.
The “Clear Peaks” button will erase all found peaks.The “Make ROI” button allows the user to take a group of
