ORTEC
®
Detective-EX/DX
®
-100T Portable HPGe Spectrometer — User’s Manual 931040P / 1014
24
Figure 17. On the Advanced
Menu, Tap the Calibrate Button.
Figure 18. Tap the “Start Calibra-
tion Now” Button.
If the docking station is not available or if you are using the PAC-II, a small calibration source
can be used in conjunction with the manual calibration check to ensure the unit remains in
calibration.
To perform the manual calibration check:
! On the Survey Mode screen, tap on Advanced (see Fig. 17), then Calibrate.
! Position the indicated source (in this case,
60
Co) in front of the detector window, then tap
the Start Calibration Now (Fig. 18) button.
! While calibration is in progress (Fig. 19), the unit will show the Time remaining. This
interval will depend on the strength of your calibration source.
! At the end of the calibration period, the Use Improved Calibration button will be
displayed, along with the calibration and peak-shape indicators for the new measurement
(Fig. 20).
The choice is yours whether to use this new calibration or not. To accept it, tap Use
Improved Calibration. Usually, the proposed change in calibration is of the order of the
one shown in Fig. 20. If it is larger than 0.3%, the cause should be investigated (see
Section 7.8).
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