3.2. User Attended Mode
Figure 3-3. Modes of Operation - Dose Rate Mode
detected counts above 40 keV is greater than 40%. The “Low Energy” alert
is displayed if this ratio is smaller than 10%. Should this ratio fall between
“High Energy” and “Low Energy” levels, the device describes the source as
“Balanced”. s
From Dose Rate mode, a press on the left ACTION button switches the device
into Finder mode to search for radioactive materials.
Figure 3-4. Modes of Operation - Finder Mode
Count rate information and the associated values are given as count rate over
time in the scrolling histogram area of the display to facilitate location of the
source of radioactivity. If the speaker is enabled, an audible signal is gener-
ated, with its pitch as a function of the ambient dose rate.
Thermo Fisher Scientific Interceptor™/en/5.1(4956)/Feb2010 25
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