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becomes the more scale segments start to be highlighted from left to right. The scale
becomes fully highlighted when the intensity equals to 3100 pulse/s pulse count rate from
the gamma and beta detector. DER is about 400 µSv/h in this case.
The sound symbol (4) means that audio signaling of registered gamma quanta is on.
If signaling is on, the sound symbol is displayed on the LCD and each registered gamma
quantum is followed by a short audio signal.
Audio signaling of registered gamma quanta is switched on and off in the submode
of alarm threshold level programming.
Photon-ionizing radiation DER is measured in the following way. As soon as the
measurement is started the LCD of the radiometer begins to display the measurement
results and the statistical error values that correspond to these results. In the process of
measurement the statistical error of each next measurement result becomes smaller, and in
some time it reaches the specified statistical error. If this error is reached, a part of statistical
information starts to be rejected while the measurement process continues. Therefore, all
the following measurement results have the statistical error, which is equal to or less than
the specified one.
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