GammaVision
®
v7 (A66-BW) 783620H / 1013
next-lower multiplet. To look at individual peaks in the multiplet, use the
Peak, Energy, or Unknown buttons.
To add a peak to the analysis library, position the marker at the desired location and click Add.
This adds a temporary nuclide to the library (assigned the name “Analyze” in the results table) with a peak at this energy. A new analysis is performed and the new results are displayed. More peaks can be added as needed.
To delete a peak, click the peak energy in the Analysis Results List. The marker will jump to this channel in the spectrum. Click Delete. A new analysis is performed and the new results are displayed.
The energy calibration for all the peaks in the spectrum can be shifted with the Shift (keV) field and slide bar (Fig. 196). Select the amount of shift and click OK. The shift increments in energy equivalent to
0.1 channel. GammaVision will perform the new analysis and display the results.
Fig. 196. Shift keV.
The residuals are the differences between the calculated spectrum (based on peak shape, peak area, and background) and the actual raw data. These can be displayed in the spectrum window by marking the Show Residuals check box (refer to Fig. 185). The scaling factor for the residual display is the same as for the data display. In log mode, the scale of the residuals display is somewhat exaggerated and the residuals might appear more significant than they actually are.
The results of this analysis are stored in memory and can be stored as a
.UFO
file on disk by selecting Store Results As... from the Analysis Sidebar’s control menu. Mark/unmark the Table item to show/hide the Analysis Results Table. Use the Print command in the results window’s control menu to print the results table.
5.6. Library
The Library menu commands (Fig. 197) allow you to select, display, create, edit, or print the library files used in the Analyze and Calibrate sections, using either the GammaVision library editor discussed here or the NuclideNavigator III library editor. Library files are organized by nuclide, then by the nuclide’s peaks. Both
.LIB
and
.MDB
libraries are supported.
Fig. 197. Library
Menu.
The nuclide library is used with reference to the peak-search or report functions for quantitative identification of and activity calculations for spectral components according to calibrated peak energy. The nuclide library data include the nuclide name, half-life,
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