Chapter 3 Parameters
Mini-Switch LB 471
Calculate full count rate automatically:
Enter -1.
The count rate is calculated automatically and continuously updat-
ed depending on the half-value layers defined in code 39 and the
empty count rate. If values have been set in code 33 and 35, the
full count rate is calculated based on these values instead of the
data in code 39.
The full count rate will be used for measurement only after you
have set all necessary parameters and have performed a calibra-
tion with code 36.
The calibration value will then be transferred to code 21.
For critical applications we recommend reading in the full count
rate.
Zero count rate (cps)
Read in or enter zero count rate
For more information on the zero count rate see page 58.
The zero count rate is important because it ensures that the count
rates in code 20 and 21 are correctly decay-compensated.
The zero count rate has to be determined without radiation being
emitted by the source. Therefore, it should be measured before
the source has been installed. The bigger the scintillator, the more
important the determination of the zero count rate. If you are
working with the Super-Sens, it is absolutely essential that
you measure the zero count rate. However, if you are working
with the GM-detector the determination of the zero count rate is
not important and the standard value may be retained.
If the detector code (code 5) has been changed, then code 32 will
be overwritten by a standard value.
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