ORTEC
®
Detective-EX/DX
®
-100T Portable HPGe Spectrometer — User’s Manual 931040P / 1014
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If the calibration fails, an error message will be displayed. For more detailed calibration troubleshooting, see
Section 7.8.
50
Figure 42. Start Manual
Calibration.
Figure 43. Wait for Completion.
At the end of the calibration period, the Use Improved Calibration button will be displayed
(Fig. 44), along with the actual energy of the calibration source peak. For the factory-defined
sources, the Centroid values should ideally be:
!
137
Cs — 661.62 keV !
40
K — 1460.75 keV
In addition, the screen will display the full width at half-maximum (FWHM), an indicator of
peak shape; and the calibration adjustment (Cal. Adjust). The calibration adjustment is the
difference between the spectrum position of the calibration source’s peak in the new calibration
and the position of the same peak in the current calibration, expressed in energy, as a percentage
of the actual peak energy.
5.1.3.2. Apply the Improved Calibration
When the calibration measurement is complete and the Use Improved Calibration button is
displayed, choose whether or not to use this new calibration. Usually, the proposed change in
calibration is quite small, and sometimes it is even zero. If it is larger than 0.3%, the cause
should be investigated. To use the new calibration, tap Use Improved Calibration.
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