Differences

This shows you the differences between two versions of the page.

--- calibration [2023/05/09 13:30] – [Efficiency Calibration Creation for a Detector] felix
+++ calibration [2023/05/09 13:57] (current) – [Calibration] felix
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 ====== Calibration ======
-Calibrations contain information regarding energy, full width at half maximum (FWHM) and efficiency calibrations. They must be selected and loaded for analyses (see [[Analysis Parameters]]). In //LVis// / //GammaVision// calibrations (''.CLB'' files) or any calibrated //LVis// measurement file (''.LVM'' files) can be used as a source of calibration.
+Calibrations contain information regarding energy, full width at half maximum (FWHM) and efficiency calibrations. They must be selected and loaded for analyses (see [[Analysis Parameters]]). In //LVis//, //GammaVision// calibrations (''.CLB'' files) or any calibrated //LVis// measurement file (''.LVM'' files) can be used as a source of calibration.
 In each //LVis// measurement, the calibration is presented in its own tab (see as well [[Changing a Calibration in an .LVM file]]).
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 ===== Changing a Calibration in an .LVM File=====
+In an already existing measurement (''.LVM'' file), two ways exist to change a calibration. Either you open the calibration table and directly change the internal calibration by adding or deleting entries; or you load a complete energy or efficiency calibration from a ''GammaVision'' ''.CLB'' or //LVis// ''.LVM'' file.
+This can be done by clicking on //Calibration file// in the [[Analysis tab]]. After a file is selected, it is possible to decide in the following dialog with which parts of this file the internal calibration should be overridden.
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+If you would like to directly edit the internal calibration, you must always open the internal calibration table in an ''.LVM'' measurement via the lower left button.
+The calibration table shows all nodes of both calibrations. You can switch in between them via the //Energy// and //Efficiency// buttons in the bottom left of the calibration table window.
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+It is possible to delete individual table entries as well as all data. You can undo the last change via the //Back// button. All changes will be immediately displayed in the Calibration/Library tab and new data will be considered in the fit. If the calibration table is open, the Calibration/Library tab will only show the graph valid for the respective calibration.
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+It is possible to add existing calibration data from GammaVision ''.ENT'', ''.EFT'', ''.CLB'' or //LVis//'s ''.LVM'' files to the one currently being edited. Simply click the //Import// button in the right top corner of the calibration table, and select the file from which the calibration data shall be added.
+In order to add a new entry to the calibration table manually based on the spectrum data, the respective peak parameters must be adjusted in the peak editor first. The peak editor can be started from the [[Spectrum tab]]. You can either directly click on a peak in the spectrum; or ''double-click'' on the library information in the calibration table to go to the respective position in the spectrum. This will open the peak editor.
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+In order to change individual peak characteristics, you must first select the respective parameter on the right side. Click and drag the vertical marker line to change the value.
+This screen also allows you to assign the peak to a (different) nuclide. If you click on the icon next to the nuclide name, a list of all peaks in the library is displayed from which you can select the desired entry.
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+After all parameters have been adjusted, the peak can be applied to the calibration table by clicking on //Apply to calibration//.
+Note that any analysis results displayed on the “Analysis results” tab of your LVM file are set to “0” when changing data in the calibration file. All fits on the //Calibration/Library// tab are re-calculated. And the reference of the calibration data on top of the graph changes to ''internal'' (see red marking in picture below).
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