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12
Calibration Verification:
1. Run the Spectral Calibration. See page 11.
2. In the software, select “DigiBASE Manual Control” from the “Options” menu.
3. Place the Potassium standard (#700-410-401) on the belt centered under
the shield.
4. Set the True Time to 5 minutes and click the “Set True Time” button.
5. Click the “Clear” button.
6. Click the “Start” button.
7. When the test is complete, record the CPS and spectral value for the
standard.
8. Repeat steps 3 – 7 with the Uranium (#700-410-403) and Thorium (#700-
410-403) standards.
9. Refer to the chart below for acceptable results.
Standard
CPS Min
CPS Max
Spectral Min Spectral Max
Potassium
5.6
7.64
3.24%
5.34%
Uranium
26.26
28.12
87.28 ppm
108.88 ppm
Thorium
11.8
13.18
84.85 ppm
109.39 ppm