Uni-Probe LB 490
BERTHOLD TECHNOLOGIES GmbH & Co. KG
7 – 709
Volume 7 6 Explanations
7
6.4.1 Explanation on Calibration of the Lower Cali-
bration Point
This empty calibration will have influence on the whole curve. Due
to this, all count rates will be adjusted. That will keep the shape of
the curve, because all calibration points are extrapolated as per-
centage of the difference between the old and the new “lower cali-
bration point”.
Adjustment can be conducted for two reasons:
• In the past you have already carried out multi-point calibration
by emptying the vessel.
Now you will update the calibration by adjusting the lower cali-
bration point only, e.g. if the source has been replaced.
• A theoretical curve with several points is calculated. It is possi-
ble to enter these calibration points.
Then update the calibration curve by adjusting the lower cali-
bration point only.
The adjustment will be done as follows:
1. Table with value pairs before adjustment.
Figure 6-9 Calibration curve
2. Adjustment of the lower calibration point (0%) by 5000cps.
(background e.g. = 100cps)
3. Table with value pairs before adjustment.
Level in % Pulse rate in cps
0 7000
40 5000
70 3000
100 200
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