1. The Principle of Operation of the LB 124 Scint LB 124 Scint
6
Range of application of the ratemeter, scaler-timer and survey modes
Measurements in the operating modes "Survey" and "Rateme-
ter" are used to detect contaminations. In this mode, every
change in the radiation field is quickly indicated. In the Survey
mode a lower measurement accuracy is accepted in order to
detect changes even more quickly.
An accurate measurement requires - in contrast to the Survey
mode - averaging of the count rates over a longer period of
time. The LB 124 Scint does this automatically in the Rateme-
ter mode, provided that the mean count rate remains constant
within the statistical significance range during this period. This
can for example be assumed for a contamination measure-
ment, if the device is not moved during measurement.
To carry out stationary measurements with a given accuracy for
the average value, however, it is advisable to select the operat-
ing mode Scaler-Timer. In this measurement mode, you can
preset either the averaging interval or – by selecting the num-
ber of pulses per unit time – the statistical accuracy of the
measured value.
For great demands concerning the accuracy, you are also able
to determine the background (immediately before the actual
measurement) in the CPS (raw data) mode by means of the
scaler-timer, and to enter this background value immediately.
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