ECOTEST VIRTUOSO RKG-14, Руководство по эксплуатации, Страница: 34 / 99

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Display options in the expert mode:
1 A gamma radiation spectrum (Figure 2.12 (a)) is activated upon tapping a
button. The experienced users with its help can visually control (observe)
typical display of cesium radiation in the spectrum or control potential
abnormalities of background radiation.
There are such tools available in this mode:
a)
spectrum scaling, which is activated with a button (the tool
expands and reduces the spectrum either horizontally or vertically);
b) cursor, which is activated with a button. It allows placing the
cursor (a red vertical line) in the required position. The diagram represents the
values of channel and energy at this cursor position;
c) spectrum display option – a view of the button depends on the display
option selected: (input spectrum display) or (output spectrum
display).
The input spectrum includes a background constituent, while the output one
is free from background. Moreover, in the output spectrum channels associated
with
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Cs and
137
Cs are highlighted in yellow and orange, respectively.
2 A “trend” display (Figure 2.12 (b)) is activated with a button and
features a diagram of maximum and minimum activity values with a true value
within their limits. The values of specific activity in Bq/kg and volume activity in
Bq/l, as well as a current measurement error are represented in the diagram.
There are such tools available in this mode:
a. scaling , which is activated with a button (expands and reduces the
trend from top to bottom);
b. cursor , which is activated with a button. It allows placing the
cursor (a red horizontal line) at the required level of specific activity.
2.1 The upper and the lower trend lines create a band diving probable values
of specific activity. A true value of specific activity is within the limits of the upper
and the lower band edges. This band is wider at first and is getting narrower in the
course of measurement time, since the detector accumulates more and more data
and the statistic uncertainty reduces.
2.2 The band of values visualizes the development of measurement in time.
A configuration of the values band gives us the basis to evaluate the process of
measurement. To be more specific, we can visually determine if there is sufficient
time for measurement, and what level of measurement precision has been reached
at a given time.
We can also see some abnormalities in the process of measurement and
depending on their presence or absence judge about the reliability of measurement
or decide whether to carry out additional or repeated measurements.