ECOTEST MKS-UM Operating Manual page 66

A twenty-segment instantaneous value indicator (5) is intended for quick
assessment of alpha radiation intensity. Instantaneous value of alpha radiation
intensity is shown in pseudologarithmic scale. The greater the intensity, the more
segments of the indicator are highlighted from left to right. The integration time
during measurement of instantaneous value of alpha radiation intensity and the time
of information update on the instantaneous value indicator is 500 ms
Indicative values of surface alpha-particles flux density and surface activity
of alpha-emitting radionuclides, in the event of which the first and all segments of
the indicator are highlighted, are shown in Table 2.6.
Table 2.6
st
1 segment highlighted
0.3 kpart./(cm
2.3.6.7.2.5 Alpha radiation characteristics are measured as follows. After the
measurement starts the LCD of the dosimeter displays 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 process of measurement continues, but a part of statistical information is rejected.
Therefore, all next measurement results come with the estimated limits of statistical
deviations equal to or less than the specified ones.
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 until the estimated limits of
statistical deviations exceed 99 %.
Annex C 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 counter, which is applied to ABG probe,
was used for charts plotting).
·min)
2
All segments highlighted
250 kpart./( cm
64
·min)
2