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C.2 Calibration
instrument, and is completely transparent to the user. Once the radEAGLET-R finds known
radiation patterns and is sufficiently confident about the analysis result, it uses this infor-
mation to make an automatic calibration adjustments. In many cases, the most prominent
peak to do this is 1460 keV associated with natural potassium
are other peaks (natural and/or non-natural) used by this instrument to create a superior
stabilization process.
C.2 Calibration
The calibration has a tremendous impact on the measurement quality of the instrument.
It determines the precision of the current calibration by locating the peak at the correct
position. The radEAGLET-R has a dedicated screen to visually inspect the calibration quality
when performing a calibration, see 5.18, p. 76.
The value for the resolution is generated by dividing the FWHM by the measured centroid
energy.
C.2.1 Checking the Calibration
The procedure for a visual inspection of the calibration when using a
source:
1. Place a cesium
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
centroid is the calibration error.
The radEAGLET-R is a stabilized instrument and it is not expected that the peak posi-
tions 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 phe-
nomenon from a single peak source, this could indicate a small crack inside the NaI
detector crystal. Please contact our service.
C.2.2 Re-Calibrating Using the Calibration Mode
Begin with the visual inspection of the calibration state as explained above. If you experience
a deviation between the target peak position and the actual position, you can perform a
manual recalibration.
1
137
Cesium
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.
148/163
137
1
Cs sample
in front of the detector.
Software 3.2.12r • Document 3.3.3b4o
radEAGLET-R User Manual
40
40
K. In addition to
137
Cs calibration
137
Cs and the calculated
© innoRIID GmbH • 2020-11-18
K, there
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