783620H / 1013 5. MENU COMMANDS
Close ends the Calculate from Spectra session, closing the sidebar, Attenuation Table, and graph windows. The currently selected table becomes the internal or working external attenuation table.
5.5.1.4. Geometry Correction
This command opens the Geo Correction Sidebar (Fig. 153) for building geometry correction (
.GEO
) files. These tables can be built automatically using analysis results (
.UFO
) files, or manually by entering the peak net area rates for specific energies. The correction can be greater or less than 1.0 to allow for corrections between any two geometries.
NOTE
Version 7 geometry correction (
.GEO
) files are not compatible with earlier versions of GammaVision.
Automatic Calculation
In automatic mode, select the analysis results (
.UFO
) files for the analysis of the spectra for the two geometries, and click
Calculate. This will display a table window showing the ratio of the net peak areas for all the peaks common to both spectra.
The matching is done by using the identified (library) peak list in both
.UFO
files.
Click the Description button to add a description to the file.
This is used to label the files and is copied into the spectrum file for added verification of results.
Fig. 153. Geometry
Correction Sidebar.
Manual Calculation
In the manual mode, you enter the values. In the Ratio section at the top of the sidebar, enter the
Ref Rate (Geometry 1), the Cur Rate (Geometry 2), and the energy, then click Enter. The
Ratio (correction factor) will be displayed above the Ref Rate field in the sidebar, as well as in the table window.
Click the Description button to add a description to the file. This is used to label the files and is copied into the spectrum file for added verification of results.
At the bottom of the sidebar, you may optionally enter a 1-sigma Uncertainty for this correction, ranging from 0% to 1000%.
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