Spectrum Techniques ICS-PCI, User Manual

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Functions
Energy Calibration
Energy Calibrate...The energy calibration feature allows the marker to read directly in energy units.
Two calibration functions are possible, a 2-point linear, or a 3-point quadratic fit.
In order to perform a manual energy calibration, it is first necessary to acquire a spectrum using known isotopes.
Cs-137 together with Co-60 works well for many applications, producing gamma lines at 32 keV, 662 keV, 1173 keV and
1332 keV.
Select 2-point or 3-point mode and enter the calibration units to be used, (keV or MeV). Position the marker at the highest
channel of the first peak and enter the peak energy value. Move the marker to the high point on the second peak to be
used for the calibration, enter energy number. If a 3-point calibration is required, continue by moving the marker to the
peak channel of the third peak, enter its energy and click OK. The system will now be calibrated and the marker position
will read directly in energy.
If ROI's are set around each peak used in the calibration, it is necessary only to place the marker in the ROI for the peak.
The software automatically calculates the peak centroid and uses this value for the peak position in the calibration routine.
To return to the channel number mode, click on Settings, click on Uncalibrate.
Energy Calibration may also be selected from a menu using the right mouse button.