5.3.2.4. Easy Recalibration Using An .ENT Table. ORTEC A66-BW GammaVision

783620H / 1013 5. MENU COMMANDS

5.3.2.4. Easy Recalibration Using An .ENT Table

Using the

.ENT

table can speed up the calibration process, as follows. For an uncalibrated spectrum, enter one or two energies to establish a basic calibration.

Next, click the Merge... button on the Energy Calibration Sidebar to open a standard file-recall dialog (Fig. 98).

Choose the

.ENT

file to be used. If any values exist in the Channel and FWHM columns, you will be prompted to perform a manual calibration (Fig. 99). If you select Yes, a calibration will be generated using the Energy-Channel

Fig. 98. Recall Energy Calibration Table.

and Energy-FWHM pairs from the table without regard to spectrum data. If you select No, peaks in the spectrum that match the energy list in the table will be evaluated for centroid energy and FWHM to generate a new calibration. When the process is complete, the new fit and table will be displayed.

Fig. 99. Perform a Manual Energy Calibration?

NOTE

If the No FWHM Cal checkbox on the Energy Calibration sidebar is marked, the

FWHM calibration is not changed during calibration. This might be desirable when decay of short-lived isotopes in a calibration source results in peaks that are adequate for an energy calibration but whose shape might not be optimal for the FWHM calibration.

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