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The estimated DER values when the first and all segments of the indicator are
highlighted are shown in Table 2.4.
Table 2.4
Probe or detector
Detector built in the
control unit
BG probe
ABG probe
2.3.6.5.2.5 DER measurement using the detector built in the control unit or
ABG/BG probe is done as follows. After the measurement starts the LCD of the
dosimeter begins displaying measurement results and estimated limits of statistical
deviations of these results. Firstly, the estimated limits of statistical deviations of
measurement results are large. In the process of measurement the estimated limits of
statistical deviations of measurement results decrease and eventually reach the
specified limits of statistical deviations. After that the measurement process
continues, but a part of statistical information is rejected. Therefore, the estimated
limits of statistical deviations of all next measurement results are equal to or less than
the specified one.
At any moment in time, the user can restart the measurement process by shortly
pressing RAYS/RESTART.
The specified limits of statistical deviations can be determined by the dosimeter
automatically, depending on the radiation intensity, or can be specified by the user
in the submode of the alarm threshold level programming.
A blinking "%" symbol shows that the specified limits of statistical deviations
have been set by the user.
"пп%" symbols are displayed on the LCD as long as the estimated limits of
statistical deviations exceed 99 %.
Annex A shows the dependence of the specified limits of statistical deviations
determined by the dosimeter on the radiation intensity, as well as approximate time
of statistical information accumulation necessary to obtain measurement results with
the estimated limits of statistical deviations, which are equal to the main relative
permissible error limit and the specified limits of statistical deviations determined by
the dosimeter. (Typical sensitivity of the counters, which is applied to the control
unit and the ABG/BG probe, was used for charts plotting).
st
1
segment highlighted
4 μSv/h
0.8 μSv/h
0.5 μSv/h
47
DER
All segments highlighted
0.6 Sv/h
10 Sv/h
1 Sv/h
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