ORTEC RADEAGLET, User Manual

Page: 33 / 60

Figure 24: Source selection
The value for the resolution is generated by dividing the FWHM by the measured centroid energy. You
can leave the
CALIBRATION MODE at any time by pressing the SETTINGS button. This brings you back to
the SETTINGS .
The procedure for a visual inspection of the calibration when using a
137
Cs calibration source:
1. Place a cesium
137
Cs sample
1
in front of the detector.
2. Wait until a reliable fit of the peak is established. This can take several seconds. You can identify a
good fit when the calculated values show up.
3. The difference between the target value E=661.6 keV of
137
Cs and the calculated centroid is the
calibration error.
The RADEAGLET is a stabilized instrument and it is not expected that the peak positions will drift
much. Sometimes a recalibration is still needed because environmental circumstances might be
unfavorable for the background stabilization.
If you experience unusually high values in the resolution and/or a double peak phenomenon from a
single peak source, this could indicate a small crack inside the NaI detector crystal. Please contact
the service department.
1
Cesium
137
Cs has a photo peak at the energy E=661.6 keV. It is a popular radionuclide for calibration purposes. It is available
as a sealed button source (check source) from radionuclide suppliers.
© innoRIID GmbH RADEAGLET User Manual• Software 2.1.16 • Document 1.32o • 2017-12-15 Page 33 of 60